Pre-Columbian trans-oceanic contact theories
Pre-Columbian trans-oceanic contact theories speculate about possible visits to or interactions with the Americas, the indigenous peoples of the Americas, or both, by people from Africa, Asia, Europe, or Oceania at a time prior to Christopher Columbus' first voyage to the Caribbean in 1492 (i.e. during any part of the so-called pre-Columbian era). Such contact is accepted as having occurred in prehistory during the human migrations that led to the original settlement of the Americas, but has been hotly debated in the historic period.
Only one historical case of pre-Columbian contact is widely accepted among the scientific and scholarly mainstream. Maritime explorations by Norse peoples from Scandinavia during the late 10th century led to the Norse colonization of Greenland and of L'Anse aux Meadows in Newfoundland, which preceded Columbus' arrival in the Americas by some 500 years. There is also significant evidence of material exchange between the peoples of Siberia and Alaska dating at least five centuries before Columbus' travels to the New World.
Scientific and scholarly responses to other claims of post-prehistory, pre-Columbian contact have varied. Some of these claims are examined in reputable peer-reviewed sources. Many others—especially those based on circumstantial or ambiguous interpretations of archaeological evidence, alleged out-of-place artifacts, superficial cultural comparisons, comments in historical documents, or narrative accounts—have been dismissed as fringe science, pseudoarchaeology, or pseudohistory.
Norse trans-oceanic contact
Norse journeys to Greenland and Canada prior to Columbus' voyages are supported by historical and archaeological evidence. A Norse colony was established in Greenland in the late 10th century and lasted until the mid-15th century, with court and parliament assemblies (þing) taking place at Brattahlíð and a bishop being posted at Garðar. The remains of a Norse settlement at L'Anse aux Meadows in what is now Newfoundland, a large island on the Atlantic coast of Canada, were discovered in 1960 and have been radiocarbon-dated to between 990 and 1050 CE. This remains the only site widely accepted as evidence of post-prehistory, pre-Columbian trans-oceanic contact with the Americas (Greenland is generally not considered part of North America). L'Anse aux Meadows was named a World Heritage site by UNESCO in 1978. It is also possibly connected with the attempted colony of Vinland established by Leif Erikson around the same period or, more broadly, with Norse exploration of the Americas.
Though L'Anse aux Meadows establishes that Norse colonists traveled to and built permanent structures in North America, few sources describing contact between indigenous peoples and Norse people exist. Contact between the Thule people (ancestors of the modern Inuit) and Norse in the 12th or 13th centuries is known. The Norse Greenlanders called these incoming settlers "skrælingar". Conflict between the Greenlanders and the "skrælings" is recorded in the Icelandic Annals. The term skrælings is also used in the Vínland sagas, which relate to events during the 10th century, when describing trade and conflict with native peoples.
Similar cultures of peoples across the Bering Strait in both Siberia and Alaska suggest human travel between the two places ever since the strait was formed. After Paleo-Indians arrived during the Ice Age and began the settlement of the Americas, a second wave of people from Asia came to Alaska around 8000 BC. These "Na-Dene" peoples, who share many linguistic and genetic similarities not found in other parts of the Americas, populated the far north of the Americas and only made it as far south as Oasisamerica. It is suggested that by 4000 BC "Eskimo" peoples began coming to the Americas from Siberia. "Eskimo" tribes live today in both Asia and North America and there is much evidence they lived in Asia even in prehistoric times.
Bronze artifacts discovered in a 1,000-year-old house in Alaska suggest pre-Columbian trade. Bronze working had not been developed in Alaska at the time and suggest the bronze came from nearby Asia—possibly China, Korea, or Russia. Also inside the house were found the remains of obsidian artifacts, which have a chemical signature that indicates the obsidian is from the Anadyr River valley in Russia.
In June 2016, Purdue University published the results of research on six metal and composite metal artifacts excavated from a late prehistoric archaeological context at Cape Espenberg on the northern coast of the Seward Peninsula in Alaska. Also part of the research team was Robert J. Speakman, of the Center for Applied Isotope Studies at the University of Georgia, and Victor Mair, of East Asian Languages and Civilizations at the University of Pennsylvania. The report is the first evidence that metal from Asia reached prehistoric North America before the contact with Europeans, stating that X-ray fluorescence identified two of these artifacts as smelted industrial alloys with large proportions of tin and lead. The presence of smelted alloys in a prehistoric Inuit context in northwest Alaska was demonstrated for the first time and indicates the movement of Eurasian metal across the Bering Strait into North America before sustained contact with Europeans.
This is not a surprise based on oral history and other archaeological finds, and it was just a matter of time before we had a good example of Eurasian metal that had been traded [...] We believe these smelted alloys were made somewhere in Eurasia and traded to Siberia and then traded across the Bering Strait to ancestral Inuits [sic] people, also known as Thule culture, in Alaska. Locally available metal in parts of the Arctic, such as native metal, copper and meteoritic and telluric iron were used by ancient Inuit people for tools and to sometimes indicate status. Two of the Cape Espenberg items that were found – a bead and a buckle — are heavily leaded bronze artifacts. Both are from a house at the site dating to the Late Prehistoric Period, around 1100-1300 AD, which is before sustained European contact in the late 18th century. [...] The belt buckle also is considered an industrial product and is an unprecedented find for this time. It resembles a buckle used as part of a horse harness that would have been used in north-central China during the first six centuries before the Common Era.— H. Kory Cooper, Associate Professor of Anthropology.
Claims of Polynesian contact
The sweet potato, a food crop native to the Americas, was widespread in Polynesia by the time European explorers first reached the Pacific. Sweet potato has been radiocarbon-dated in the Cook Islands to 1000 CE, and current thinking is that it was brought to central Polynesia c. 700 CE and spread across Polynesia from there. It has been suggested that it was brought by Polynesians who had traveled across the Pacific to South America and back, or that South Americans brought it to Polynesia. It is also possible that the plant floated across the ocean after being discarded from the cargo of a boat. Phylogenetic analysis supports the hypothesis of at least two separate introductions of sweet potatoes from South America into Polynesia, including one before and one after European contact.
Dutch linguists and specialists in Amerindian languages Willem Adelaar and Pieter Muysken have suggested that the word for sweet potato is shared by Polynesian languages and languages of South America. Proto-Polynesian *kumala (compare Easter Island kumara, Hawaiian ʻuala, Māori kumāra; apparent cognates outside Eastern Polynesian may be borrowed from Eastern Polynesian languages, calling Proto-Polynesian status and age into question) may be connected with Quechua and Aymara k'umar ~ k'umara.
According to Adelaar and Muysken, the similarity in the word for sweet potato "constitutes near proof of incidental contact between inhabitants of the Andean region and the South Pacific." The authors argue that the presence of the word for sweet potato suggests sporadic contact between Polynesia and South America, but no migrations.
A team of academics headed by the University of York's Mummy Research Group and BioArch, while examining a Peruvian mummy at the Bolton Museum, found that it had been embalmed using a tree resin. Before this it was thought that Peruvian mummies were naturally preserved. The resin, found to be that of an Araucaria conifer related to the monkey puzzle tree, was from a variety found only in Oceania and probably New Guinea. "Radiocarbon dating of both the resin and body by the University of Oxford's radiocarbon laboratory confirmed they were essentially contemporary, and date to around CE 1200."
Researchers including Kathryn Klar and Terry Jones have proposed a theory of contact between Hawaiians and the Chumash people of Southern California between 400 and 800 CE. The sewn-plank canoes crafted by the Chumash and neighboring Tongva are unique among the indigenous peoples of North America, but similar in design to larger canoes used by Polynesians for deep-sea voyages. Tomolo'o, the Chumash word for such a craft, may derive from kumula'au, the Hawaiian term for the logs from which shipwrights carve planks to be sewn into canoes. The analogous Tongva term, tii'at, is unrelated. If it occurred, this contact left no genetic legacy in California or Hawaii. This theory has attracted limited media attention within California, but most archaeologists of the Tongva and Chumash cultures reject it on the grounds that the independent development of the sewn-plank canoe over several centuries is well-represented in the material record.
In 2007, evidence has emerged which suggested the possibility of pre-Columbian contact between the Mapuche people (Araucanians) of south-central Chile and Polynesians. Bones of Araucana chickens found at El Arenal site in the Arauco Peninsula, an area inhabited by Mapuche, support a pre-Columbian introduction of landraces from the South Pacific islands to South America.  The bones found in Chile were radiocarbon-dated to between 1304 and 1424, before the arrival of the Spanish. Chicken DNA sequences were matched to those of chickens in American Samoa and Tonga, and found to be dissimilar to those of European chickens.
However, this finding was challenged by a 2008 study questioned its methodology and concluded that its conclusion is flawed, although the theory it posits may still be possible. Another study in 2014 reinforced that dismissal, and posited the crucial flaw in the initial research: "The analysis of ancient and modern specimens reveals a unique Polynesian genetic signature" and that "a previously reported connection between pre-European South America and Polynesian chickens most likely resulted from contamination with modern DNA, and that this issue is likely to confound ancient DNA studies involving haplogroup E chicken sequences." 
Ageratum conyzoides, also known as billygoat-weed, chick weed, goatweed, or whiteweed, is native to the tropical Americas, and was found in Hawaii by William Hillebrand in 1888 who considered it to have grown there before Captain Cook's arrival in 1778. A legitimate native name (meie parari or mei rore) and established native medicinal usage and use as a scent and in leis confirmed the pre-Cookian age.
Turmeric (Curcuma longa) originated in Asia, and there is linguistic and circumstantial evidence of the spread and use of turmeric by the Austronesian peoples into Oceania and Madagascar. Günter Tessmann in 1930 reported that a species of Curcuma was grown by the Amahuaca tribe to the east of the Upper Ucayali River in Peru and was a dye-plant used for the painting of the body, with the nearby Witoto people using it as face paint in their ceremonial dances. David Sopher noted in 1950 that "the evidence for a pre-European, transpacific introduction of the plant by man seems very strong indeed".
Linguistics of Stone Axe
Similarity of features and genetics
In December 2007, several human skulls were found in a museum in Concepción, Chile. These skulls originated from Mocha Island, an island just off the coast of Chile in the Pacific Ocean, formerly inhabited by the Mapuche. Craniometric analysis of the skulls, according to Lisa Matisoo-Smith of the University of Otago and José Miguel Ramírez Aliaga of the Universidad de Valparaíso, suggests that the skulls have "Polynesian features" – such as a pentagonal shape when viewed from behind, and rocker jaws.
From 2007 to 2009, geneticist Erik Thorsby and colleagues have published two studies in Tissue Antigens that evidence an Amerindian genetic contribution to human populations on Easter Island, determining that it was probably introduced before European discovery of the island. In 2014, geneticist Anna-Sapfo Malaspinas of The Center for GeoGenetics at the University of Copenhagen published a study in Current Biology that found human genetic evidence of contact between the populations of Easter Island and South America, dating to approximately 600 years ago (i.e. 1400 CE ± 100 years).
Some members of the now-extinct Botocudo people, who lived in the interior of Brazil, were found in research published in 2013 to have been members of mtDNA haplogroup B4a1a1, which is normally found only among Polynesians and other subgroups of Austronesians. This was based on an analysis of fourteen skulls. Two belonged to B4a1a1 (while twelve belonged to subclades of mtDNA Haplogroup C1, common among Native Americans). The research team examined various scenarios, none of which they could say for certain were correct. They dismissed a scenario of direct contact in prehistory between Polynesia and Brazil as "too unlikely to be seriously entertained." While B4a1a1 is also found among the Malagasy people of Madagascar (which experienced significant Austronesian settlement in prehistory), the authors described as "fanciful" suggestions that B4a1a1 among the Botocudo resulted from the African slave trade (which included Madagascar).
A genetic study published in Nature in July 2015 stated that "some Amazonian Native Americans descend partly from a ... founding population that carried ancestry more closely related to indigenous Australians, New Guineans and Andaman Islanders than to any present-day Eurasians or Native Americans". The authors, who included David Reich, added: "This signature is not present to the same extent, or at all, in present-day Northern and Central Americans or in a ~12,600-year-old Clovis-associated genome, suggesting a more diverse set of founding populations of the Americas than previously accepted." This appears to conflict with an article published roughly simultaneously in Science which adopts the previous consensus perspective, i.e. that the ancestors of all Native Americans entered the Americas in a single wave of migration from Siberia no earlier than ~23 ka, separated from the Inuit, and diversified into "northern" and "southern" Native American branches ~13 ka. There is evidence of post-divergence gene flow between some Native Americans and groups related to East Asians/Inuit and Australo-Melanesians.
Claims of East Asian contact
Claims of contact with Ecuador
A 2013 genetic study suggests the possibility of contact between Ecuador and East Asia. The study suggests that the contact could have been trans-oceanic or a late-stage coastal migration that did not leave genetic imprints in North America.
Claims of Chinese contact
Other researchers have argued that the Olmec civilization came into existence with the help of Chinese refugees, particularly at the end of the Shang dynasty. In 1975, Betty Meggers of the Smithsonian Institution argued that the Olmec civilization originated due to Shang Chinese influences around 1200 BCE. In a 1996 book, Mike Xu, with the aid of Chen Hanping, claimed that celts from La Venta bear Chinese characters. These claims are unsupported by mainstream Mesoamerican researchers.
Other claims have been made for early Chinese contact with North America. In 1882 approximately 30 brass coins apparently strung together were found in the area of the [[Cassiar]Gold Rush]] apparently near Dease Creek, an area mainly controlled by Chinese gold miners. A contemporary account states that:
In the summer of 1882 a miner found on De Foe (Deorse?) creek, Cassiar district, Br. Columbia, thirty Chinese coins in the auriferous sand, twenty-five feet below the surface. They appeared to have been strung, but on taking them up the miner let them drop apart. The earth above and around them was as compact as any in the neighborhood. One of these coins I examined at the store of Chu Chong in Victoria. Neither in metal nor markings did it resemble the modern coins, but in its figures looked more like an Aztec calendar. So far as I can make out the markings, this is a Chinese chronological cycle of sixty years, invented by Emperor Huungti, 2637 BCE, and circulated in this form to make his people remember it.
Grant Keddie, Curator of Archeology at the Royal B.C. Museum identified these as good luck temple tokens minted in the 19th century. He believed that claims that these were very old made them notorious and that "The temple coins were shown to many people and different versions of stories pertaining to their discovery and age spread around the province to be put into print and changed frequently by many authors in the last 100 years."
A group of Chinese Buddhist missionaries led by Hui Shen before 500 CE claimed to have visited a location called Fusang. Although Chinese mapmakers placed this territory on the Asian coast, others have suggested as early as the 1800s that Fusang might have been in North America, due to perceived similarities between portions of the California coast and Fusang as depicted by Asian sources.
In his book 1421: The Year China Discovered the World, British author Gavin Menzies made the controversial claim that the fleet of Zheng He arrived in America in 1421. Professional historians contend that Zheng He probably reached the eastern coast of Africa, but dismiss Menzies' hypothesis as entirely without proof.
In 1973 and 1975, doughnut-shaped stones were discovered off the coast of California that resembled stone anchors used by Chinese fishermen. These (sometimes called the Palos Verdes stones) were initially thought to be up to 1,500 years old and therefore proof of pre-Columbian contact by Chinese sailors. Later geological investigations showed them to be made of a local rock known as Monterey shale, and they are thought to have been used by Chinese settlers fishing off the coast in the 19th century.
Claims of Japanese contact
Smithsonian archaeologist Betty Meggers wrote that pottery associated with the Valdivia culture of coastal Ecuador dated to 3000–1500 BCE exhibited similarities to pottery produced during the Jōmon period in Japan, arguing that contact between the two cultures might explain the similarities. Chronological and other problems have led most archaeologists to dismiss this idea as implausible. The suggestion has been made that the resemblances (which are not complete) are simply due to the limited number of designs possible when incising clay.
Alaskan anthropologist Nancy Yaw Davis claims that the Zuni people of New Mexico exhibit linguistic and cultural similarities to the Japanese. The Zuni language is a linguistic isolate, and Davis contends that the culture appears to differ from that of the surrounding natives in terms of blood type, endemic disease, and religion. Davis speculates that Buddhist priests or restless peasants from Japan may have crossed the Pacific in the 13th century, traveled to the American Southwest, and influenced Zuni society.
In the 1890s, lawyer and politician James Wickersham argued that pre-Columbian contact between Japanese sailors and Native Americans was highly probable, given that from the early 17th century to the mid-19th century several dozen Japanese ships are known to have been carried from Asia to North America along the powerful Kuroshio Currents. Japanese ships landed at places between the Aleutian Islands in the north and Mexico in the south, carrying a total of 293 people in the 23 cases where head-counts were given in historical records. In most cases, the Japanese sailors gradually made their way home on merchant vessels. In 1834, a dismasted, rudderless Japanese ship was wrecked near Cape Flattery in the Pacific Northwest. Three survivors of the ship were enslaved by Makahs for a period before being rescued by members of the Hudson's Bay Company. They were never able to return to their homeland due to Japan's isolationist policy at the time. Another Japanese ship went ashore in about 1850 near the mouth of the Columbia River, Wickersham writes, and the sailors were assimilated into the local Native American population. While admitting there is no definitive proof of pre-Columbian contact between Japanese and North Americans, Wickersham thought it implausible that such contacts as outlined above would have started only after Europeans arrived in North America.
Claims of Indian contact
In 1879, Alexander Cunningham described the carvings on the Stupa of Bharhut in central India from c. 200 BCE and described some fruit-like detail as a custard-apple (Annona squamosa). Cunningham was not initially aware that this plant, indigenous to the New World tropics, was introduced to India after Vasco da Gama's discovery of the sea route in 1498, and the problem was pointed out to him. A 2009 study claimed to have found carbonized remains that date to 2000 BCE and appear like the seeds of the custard-apple.
Grafton Elliot Smith claimed that certain details in the Mayan stelae at Copán represented an Asian elephant. He wrote Elephants and Ethnologists, a book on the topic in 1924. Contemporary archaeologists suggested that the depictions were instead based on a tapir and Smith's suggestions have generally been dismissed by subsequent research.
Some carving details from around the 12th century in Karnataka that appear like ears of maize (Zea mays), a crop native to the New World, were interpreted by Carl Johannessen in 1989 as evidence of pre-Columbian contact. These suggestions were dismissed by multiple Indian researchers based on several lines of evidence. The object has been claimed by some to instead represent a "Muktaphala", an imaginary fruit bedecked with pearls.
Claims of African and Middle Eastern contact
Claims involving African contact
Proposed claims for an African presence in Mesoamerica stem from attributes of the Olmec culture, the claimed transfer of African plants to the Americas, and interpretations of European and Arabic historical accounts.
The Olmec culture existed from roughly 1200 BCE to 400 BCE. The idea that the Olmecs are related to Africans was suggested by José Melgar, who discovered the first colossal head at Hueyapan (now Tres Zapotes) in 1862. More recently, Ivan Van Sertima has presented multiple lines of evidence to suggest an African influence on Mesoamerican culture. His conclusions have been severely criticized by mainstream academics.
Leo Wiener's "Africa and the Discovery of America" suggests similarities between Mandinka and native Mesoamerican religious symbols such as the winged serpent and the sun disk, or Quetzalcoatl, and words that have Mande roots and share similar meanings across both cultures, such as "kore", "gadwal", and "qubila" (in Arabic) or "kofila" (in Mandinka).
North African sources describe what some consider to be visits to the New World by a Mali fleet in 1311, led by Abu Bakr II. According to the abstract of Columbus' log made by Bartolomé de las Casas, the purpose of Columbus' third voyage was to test both the claims of King John II of Portugal that "canoes had been found which set out from the coast of Guinea [West Africa] and sailed to the west with merchandise" as well as the claims of the native inhabitants of the Caribbean island of Hispaniola that "from the south and the southeast had come black people whose spears were made of a metal called guanín...from which it was found that of 32 parts: 18 were gold, 6 were silver, and 8 copper." Brazilian researcher Niede Guidon, who led the Pedra Furada sites excavations "... said she believed that humans ... might have come not overland from Asia but by boat from Africa", with the journey taking place 100,000 years ago, well before the accepted dates for the earliest human migrations that led to the prehistoric settlement of the Americas. Michael R. Waters, a geoarchaeologist at Texas A&M University, noted the absence of genetic evidence in modern populations to support Guidon's claim.
Claims involving Arab contact
Early Chinese accounts of Muslim expeditions state that Muslim sailors reached a region called Mulan Pi ("magnolia skin") (Chinese: 木蘭皮; pinyin: Mùlán Pí; Wade–Giles: Mu-lan-p'i). Mulan Pi is mentioned in Lingwai Daida (1178) by Zhou Qufei and Zhufan Zhi (1225) by Chao Jukua, together referred to as the "Sung Document". Mulan Pi is normally identified as Spain of the Almoravid dynasty (Al-Murabitun), though some fringe theories hold that it is instead some part of the Americas.
One supporter of the interpretation of Mulan Pi as part of the Americas was historian Hui-lin Li in 1961, and while Joseph Needham was also open to the possibility, he doubted that Arab ships at the time would have been able to withstand a return journey over such a long distance across the Atlantic Ocean, pointing out that a return journey would have been impossible without knowledge of prevailing winds and currents.
According to Muslim historian Abu al-Hasan Ali al-Mas'udi (871–957), Khashkhash Ibn Saeed Ibn Aswad sailed over the Atlantic Ocean and discovered a previously unknown land (Arḍ Majhūlah, Arabic: أرض مجهولة) in 889 and returned with a shipload of valuable treasures. The passage has been alternately interpreted to imply that Ali al-Masudi regarded the story of Khashkhash to be a fanciful tale.
Claims involving ancient Phoenician contact
In 1996, Mark McMenamin proposed that Phoenician sailors discovered the New World c. 350 BC. The Phoenician state of Carthage minted gold staters in 350 BC bearing a pattern in the reverse exergue of the coins, which McMenamin interpreted as a map of the Mediterranean with the Americas shown to the west across the Atlantic. McMenamin later demonstrated that these coins found in America were modern forgeries.
Claims involving ancient Judaic contact
The Bat Creek inscription and Los Lunas Decalogue Stone have led some to suggest the possibility that Jewish seafarers may have traveled to America after fleeing the Roman Empire at the time of the Jewish–Roman Wars in the 1st and 2nd centuries CE.
However, American archaeologists Robert C. Mainfort, Jr., and Mary L. Kwas argued in American Antiquity (2004) that the inscription was copied from an illustration in an 1870 Masonic reference book and introduced by the Smithsonian field assistant who found it during excavation activities.
As for the Decalogue Stone, there are mistakes that suggest it was carved by one or more novices who overlooked or misunderstood some details on a source Decalogue from which they copied it. Since there is absolutely no other evidence or archeological context in the vicinity, it is most likely that the legend at the nearby university is true—that the stone was carved by two anthropology students whose signatures can be seen inscribed in the rock below the Decalogue, "Eva and Hobe 3-13-30."
Scholar Cyrus H. Gordon believed that Phoenicians and other Semitic groups had crossed the Atlantic in antiquity, ultimately arriving in both North and South America. This opinion was based on his own work on the Bat Creek inscription. Similar ideas were also held by John Philip Cohane; Cohane even claimed that many geographical placenames in the United States have a Semitic origin.
Claims of European contact
The Solutrean hypothesis argues that Europeans migrated to the New World during the Paleolithic era, circa 16,000 to 13,000 BCE. This hypothesis proposes contact partly on the basis of perceived similarities between the flint tools of the Solutrean culture in modern-day France, Spain and Portugal (which thrived circa 20,000 to 15,000 BCE), and the Clovis culture of North America, which developed circa 9000 BCE. The Solutrean hypothesis was proposed in the mid-1990s. It has little support amongst the scientific community, and genetic markers are inconsistent with the idea.
Claims involving ancient Roman contact
Evidence of contacts with the civilizations of Classical Antiquity—primarily with the Roman Empire, but sometimes also with other cultures of the age—have been based on isolated archaeological finds in American sites that originated in the Old World. The Bay of Jars in Brazil has been yielding ancient clay storage jars that resemble Roman amphorae for over 150 years. It has been proposed that the origin of these jars is a Roman wreck, although it has been suggested that they could be 15th or 16th century Spanish olive oil jars.
Romeo Hristov argues that a Roman ship, or the drifting of such a shipwreck to the American shores, is a possible explanation of archaeological finds (like the Tecaxic-Calixtlahuaca bearded head) from ancient Rome in America. Hristov claims that the possibility of such an event has been made more likely by the discovery of evidences of travels by Romans to Tenerife and Lanzarote in the Canaries, and of a Roman settlement (from the 1st century BCE to the 4th century CE) on Lanzarote island.
In 1950, an Italian botanist, Domenico Casella, suggested that a depiction of a pineapple was represented among wall paintings of Mediterranean fruits at Pompeii. According to Wilhelmina Feemster Jashemski, this interpretation has been challenged by other botanists, who identify it as a pine cone from the umbrella pine tree, which is native to the Mediterranean area.
A small terracotta head sculpture, with a beard and European-like features, was found in 1933 (in the Toluca Valley, 72 kilometres southwest of Mexico City) in a burial offering under three intact floors of a pre-colonial building dated to between 1476 and 1510. The artifact has been studied by Roman art authority Bernard Andreae, director emeritus of the German Institute of Archaeology in Rome, Italy, and Austrian anthropologist Robert von Heine-Geldern, both of whom stated that the style of the artifact was compatible with small Roman sculptures of the 2nd century. If genuine and if not placed there after 1492 (the pottery found with it dates to between 1476 and 1510) the find provides evidence for at least a one-time contact between the Old and New Worlds.
According to ASU's Michael E. Smith, John Paddock, a leading Mesoamerican scholar, used to tell his classes in the years before he died that the artifact was planted as a joke by Hugo Moedano, a student who originally worked on the site. Despite speaking with individuals who knew the original discoverer (García Payón), and Moedano, Smith says he has been unable to confirm or reject this claim. Though he remains skeptical, Smith concedes he cannot rule out the possibility that the head was a genuinely buried Post-classic offering at Calixtlahuaca.
Claims involving Greek contact in 4th century BCE
J. Richard Steffy identified that a mixture of agave leaves and pitch was used in the construction of the hull of a fourth century BCE Greek ship that had sunk at Kyrenia, Cyprus.
14th- and 15th-century European contact
Henry I Sinclair, Earl of Orkney and feudal baron of Roslin (c. 1345 – c. 1400) was a Scottish nobleman. He is best known today from a modern legend that claims he took part in explorations of Greenland and North America almost 100 years before Christopher Columbus. In 1784, he was identified by Johann Reinhold Forster as possibly being the Prince Zichmni described in letters allegedly written around 1400 by the Zeno brothers of Venice, in which they describe a voyage throughout the North Atlantic under the command of Zichmni.
Henry was the grandfather of William Sinclair, 1st Earl of Caithness, the builder of Rosslyn Chapel near Edinburgh, Scotland. The authors Robert Lomas and Christopher Knight believe some carvings in the chapel to be ears of New World corn or maize. This crop was unknown in Europe at the time of the chapel's construction, and was not cultivated there until several hundred years later. Knight and Lomas view these carvings as evidence supporting the idea that Henry Sinclair traveled to the Americas well before Columbus. In their book they discuss meeting with the wife of the botanist Adrian Dyer and explain that Dyer's wife told them that Dyer agreed that the image thought to be maize was accurate. In fact Dyer found only one identifiable plant among the botanical carvings and instead suggested that the "maize" and "aloe" were stylized wooden patterns, only coincidentally looking like real plants. Specialists in medieval architecture interpret the carvings as stylised depictions of wheat, strawberries, or lilies.
Some have conjectured that Columbus was able to persuade the Catholic Monarchs of Castile and Aragon to support his planned voyage only because they were aware of some recent earlier voyage across the Atlantic. Some suggest that Columbus himself visited Canada or Greenland before 1492, because according to Bartolomé de las Casas he wrote he had sailed 100 leagues past an island he called Thule in 1477. Whether Columbus actually did this and what island he visited, if any, is uncertain. Columbus is thought to have visited Bristol in 1476. Bristol was also the port from which John Cabot sailed in 1497, crewed mostly by Bristol sailors. In a letter of late 1497 or early 1498, the English merchant John Day wrote to Columbus about Cabot's discoveries, saying that land found by Cabot was "discovered in the past by the men from Bristol who found 'Brasil' as your lordship knows". There may be records of expeditions from Bristol to find the "isle of Brazil" in 1480 and 1481. Trade between Bristol and Iceland is well documented from the mid-15th century.
Gonzalo Fernández de Oviedo y Valdés records several such legends in his General y natural historia de las Indias of 1526, which includes biographical information on Columbus. He discusses the then-current story of a Spanish caravel that was swept off its course while on its way to England, and wound up in a foreign land populated by naked tribesmen. The crew gathered supplies and made its way back to Europe, but the trip took several months and the captain and most of the men died before reaching land. The ship's pilot, a man called Alonso Sánchez, and a few others made it to Portugal, but all were very ill. Columbus was a good friend of the pilot, and took him to be treated in his own house, and the pilot described the land they had seen and marked it on a map before dying. People in Oviedo's time knew this story in several versions, though Oviedo himself regarded it as a myth.
In 1925, Soren Larsen wrote a book claiming that a joint Danish-Portuguese expedition landed in Newfoundland or Labrador in 1473 and again in 1476. Larsen claimed that Didrik Pining and Hans Pothorst served as captains, while João Vaz Corte-Real and the possibly mythical John Scolvus served as navigators, accompanied by Álvaro Martins. Nothing beyond circumstantial evidence has been found to support Larsen's claims.
The historical record shows that Basque fishermen were present in Newfoundland and Labrador from at least 1517 onward (therefore predating all recorded European settlements in the region except those of the Norse). The Basques' fishing expeditions led to significant trade and cultural exchanges with Native Americans. A fringe theory suggests that Basque sailors first arrived in North America prior to Columbus' voyages to the New World (some sources suggest the late 14th century as a tentative date) but kept the destination a secret in order to avoid competition over the fishing resources of the North American coasts. There is no historical or archaeological evidence to support this claim.
Irish and Welsh legends
The legend of Saint Brendan, an Irish monk, involves a fantastical journey into the Atlantic Ocean in search of Paradise in the 6th century. Since the discovery of the New World, various authors have tried to link the Brendan legend with an early discovery of America. In 1977, the voyage was successfully recreated by Tim Severin using a replica of an ancient Irish currach.
According to a British myth, Madoc was a prince from Wales who explored the Americas as early as 1170. While most scholars consider this legend to be untrue, it was used as justification for British claims to the Americas, based on the notion of a Briton arriving before other European nationalities.
Biologist and controversial amateur epigrapher Barry Fell claims that Irish Ogham writing has been found carved into stones in the Virginias. Linguist David H. Kelley has criticized some of Fell's work but nonetheless argued that genuine Celtic Ogham inscriptions have in fact been discovered in America. However, others have raised serious doubts about these claims.
Claims of trans-oceanic travel originating from the New World
Claims of Egyptian coca and tobacco
Traces of coca and nicotine found in some Egyptian mummies have led to speculation that Ancient Egyptians may have had contact with the New World. The initial discovery was made by a German toxicologist, Svetlana Balabanova, after examining the mummy of a priestess called Henut Taui. Follow-up tests of the hair shaft, performed to rule out contamination, gave the same results.
A television show reported that examination of numerous Sudanese mummies undertaken by Balabanova mirrored what was found in the mummy of Henut Taui. Balabanova suggested that the tobacco may be accounted for since it may have also been known in China and Europe, as indicated by analysis run on human remains from those respective regions. Balabanova proposed that such plants native to the general area may have developed independently, but have since gone extinct. Other explanations include fraud, though curator Alfred Grimm of the Egyptian Museum in Munich disputes this. Skeptical of Balabanova's findings, Rosalie David, Keeper of Egyptology at the Manchester Museum, had similar tests performed on samples taken from the Manchester mummy collection and reported that two of the tissue samples and one hair sample did test positive for nicotine. Sources of nicotine other than tobacco and sources of cocaine in the Old World are discussed by the British biologist Duncan Edlin.
Mainstream scholars remain skeptical, and they do not see this as proof of ancient contact between Africa and the Americas, especially because there may be possible Old World sources. Two attempts to replicate Balabanova's finds of cocaine failed, suggesting "that either Balabanova and her associates are misinterpreting their results or that the samples of mummies tested by them have been mysteriously exposed to cocaine."
A re-examination in the 1970s of the mummy of Ramesses II revealed the presence of fragments of tobacco leaves in its abdomen. This became a popular topic in fringe literature and the media and was seen as proof of contact between Ancient Egypt and the New World. The investigator, Maurice Bucaille, noted that when the mummy was unwrapped in 1886 the abdomen was left open and that "it was no longer possible to attach any importance to the presence inside the abdominal cavity of whatever material was found there, since the material could have come from the surrounding environment." Following the renewed discussion of tobacco sparked by Balabanova's research and its mention in a 2000 publication by Rosalie David, a study in the journal Antiquity suggested that reports of both tobacco and cocaine in mummies "ignored their post-excavation histories" and pointed out that the mummy of Ramesses II had been moved five times between 1883 and 1975.
Icelander DNA finding
In 2010 Sigríður Sunna Ebenesersdóttir published a genetic study showing that over 350 living Icelanders carried mitochondrial DNA of a new type, C1e, belonging to the C1 clade which was until then known only from Native American and East Asian populations. Using the deCODE genetics database, Sigríður Sunna determined that the DNA entered the Icelandic population not later than 1700, and likely several centuries earlier. However Sigríður Sunna also states that "while a Native American origin seems most likely for [this new haplogroup], an Asian or European origin cannot be ruled out".
In 2014, a study discovered a new mtDNA subclade C1f from the remains of three people found in north-western Russia and dated to 7,500 years ago. It has not been detected in modern populations. The study proposed the hypothesis that the sister C1e and C1f subclades had split early from the most recent common ancestor of the C1 clade and had evolved independently, and that subclade C1e had a northern European origin. Iceland was settled by the Vikings 1,130 years ago and they had raided heavily into western Russia, where the sister subclade C1f is now know to have resided. They proposed that both subclades were brought to Iceland through the Vikings, and that C1e went extinct on mainland northern Europe due to population turnover and its small representation, and subclade C1f went extinct completely.
Norse legends and sagas
In 1009, legends report that Norse explorer Thorfinn Karlsefni abducted two children from Markland, an area on the North American mainland where Norse explorers visited but did not settle. The two children were then taken to Greenland, where they were baptized and taught to speak Norse.
In 1420, Danish geographer Claudius Clavus Swart wrote that he personally had seen "pygmies" from Greenland who were caught by Norsemen in a small skin boat. Their boat was hung in Nidaros Cathedral in Trondheim along with another, longer boat also taken from "pygmies". Clavus Swart's description fits the Inuit and two of their types of boats, the kayak and the umiak. Similarly, the Swedish clergyman Olaus Magnus wrote in 1505 that he saw in Oslo Cathedral two leather boats taken decades earlier. According to Olaus, the boats were captured from Greenland pirates by one of the Haakons, which would place the event in the 14th century.
In Ferdinand Columbus's biography of his father Christopher, he says that in 1477 his father saw in Galway, Ireland, two dead bodies which had washed ashore in their boat. The bodies and boat were of exotic appearance, and have been suggested to have been Inuit who had drifted off course.
There is also evidence of Inuit coming to Europe under their own power or as captives after 1492. A substantial body of Greenland Inuit folklore first collected in the 19th century told of journeys by boat to Akilineq, here depicted as a rich country across the ocean.
Pre-Columbian contact between Alaska and Kamchatka via the subarctic Aleutian Islands would have been conceivable, but the two settlement waves on this archipelago started on the American side and its western continuation, the Commander Islands, remained uninhabited until after Russian explorers encountered the Aleut people in 1741. There is no genetic or linguistic evidence for earlier contact along this route.
Claims of Pre-Columbian contact with Christian missionaries
During the period of Spanish colonization of the Americas, several indigenous myths and works of art led a number of Spanish chroniclers and authors to suggest that Christian preachers may have visited Mesoamerica well before the Age of Discovery. Bernal Diaz del Castillo, for example, was intrigued by the presence of cross symbols in Mayan hieroglyphs, which according to him suggested that other Christians may have arrived in ancient Mexico before the Spanish conquistadors. Fray Diego Duran, for his part, linked the legend of the Pre-Columbian god Quetzalcoatl (which he describes as being chaste, penitent, and a miracle-worker) to the Biblical accounts of Christian apostles. Fray Bartolome de las Casas describes Quetzalcoatl as being fair-skinned, tall, and bearded (therefore suggesting an Old World origin), while Fray Juan de Torquemada credits him with bringing agriculture to the Americas. Modern scholarship has cast serious doubts on several of these claims, since agriculture was practiced in the Americas well before the emergence of Christianity in the Old World, and Mayan crosses have been found to have a very different symbolism from that present in Christian religious traditions.
According to Pre-Columbian myth, Quetzalcoatl departed Mexico in ancient times by travelling east across the ocean, promising he would return. It is accepted that the Aztec emperor Moctezuma Xocoyotzin believed Spanish conquistador Hernan Cortes (who arrived in what is today Mexico from the east) to be Quetzalcoatl, and his coming to be a fulfillment of the myth's prophecy. Fringe theories suggest that Quetzalcoatl may have been a Christian preacher from the Old World who lived among indigenous peoples of ancient Mexico, and eventually attempted to return home by sailing eastwards. Carlos de Siguenza y Gongora, for example, speculated that the Quetzalcoatl myth may have originated from a visit to the Americas by Thomas the Apostle in the 1st century CE. Later on, Fray Servando Teresa de Mier argued that the cloak with the image of the Virgin of Guadalupe, which the Catholic Church claims was worn by Juan Diego, was instead brought to the Americas much earlier by Thomas, who used it as an instrument for evangelization.
Mexican historian Manuel Orozco y Berra conjectured that both the cross hieroglyphs and the Quetzalcoatl myth may have originated on a visit to Mesoamerica by a Catholic Norse missionary in medieval times. However, there is no archaeological or historical evidence to suggest that the Norse explorations ever made it as far as ancient Mexico or Central America. Other proposed identities for Quetzalcoatl - which have been attributed to their proponents pursuing religious agendas - include St. Brendan or even Jesus Christ.
Claims of ancient Jewish migration to the Americas
Since the first centuries of European colonization of the Americas and up until the 19th century, several European intellectuals and theologians tried to account for the presence of the aboriginal population by connecting them to the Ten Lost Tribes of Israel, who according to Biblical tradition were deported following the conquest of the Israeli kingdom by the Neo-Assyrian Empire. These efforts have been used in the past to further the interests of both Jewish and Christian religious groups, as well as to justify European settlement of the Americas.
One of the first to claim that the aboriginal peoples of the Americas were descendants of the Lost Tribes was Portuguese rabbi and writer Menasseh Ben Israel, who in his book The Hope of Israel argued that the discovery of the alleged long-lost Jews heralded the imminent coming of the Biblical Messiah. In 1650, a British preacher in Norfolk, Thomas Thorowgood, published Jewes in America or Probabilities that the Americans are of that Race, for the New England missionary society. Tudor Parfitt writes:
The society was active in trying to convert the Indians but suspected that they might be Jews and realized they better be prepared for an arduous task. Thorowgood's tract argued that the native population of North America were descendants of the Ten Lost Tribes.
In 1652 Sir Hamon L'Estrange, an English author writing on history and theology, published Americans no Jews, or improbabilities that the Americans are of that Race in response to the tract by Thorowgood. In response to L'Estrange, Thorowgood published a second edition of his book in 1660 with a revised title and included a foreword written by John Eliot, a Puritan missionary who had translated the Bible into an Indian language.
The Book of Mormon, a sacred text of the Latter Day Saint movement published by founder and leader Joseph Smith Jr in 1830 at the age of 24, states that some ancient inhabitants of the New World are descendants of Semitic peoples who sailed from the Old World. Mormon groups such as the Foundation for Ancient Research and Mormon Studies attempt to study and expand on these ideas. Scientific consensus rejects these claims.
The National Geographic Society, in a 1998 letter to the Institute for Religious Research, stated "Archaeologists and other scholars have long probed the hemisphere's past and the society does not know of anything found so far that has substantiated the Book of Mormon."
Some LDS scholars hold the view that archaeological study of Book of Mormon claims are not meant to vindicate the literary narrative. For example, Terryl Givens, professor of English at the University of Richmond, points out that there is a lack of historical accuracy in the Book of Mormon in relation to modern archaeological knowledge.
In the 1950s, Professor M. Wells Jakeman popularized a belief that the Izapa Stela 5 represents the Book of Mormon prophets Lehi and Nephi's tree of life vision, and was a validation of the historicity of the claims of pre-Columbian settlement in the Americas. His interpretations of the carving and its connection to pre-Columbian contact have been disputed. Since that time, scholarship on the Book of Mormon has concentrated on cultural parallels rather than "smoking gun" sources.
- Pre-Columbian era
- Origins of Paleoindians
- Genetic history of indigenous peoples of the Americas
- Columbian exchange
- Diffusion (anthropology)
- Hyperdiffusionism in archaeology
- Timeline of pre-Columbian trans-oceanic contact
- Davenport Tablets
- Institute for the Study of American Cultures
- Kensington Runestone
- Maine Penny
- Newport Tower
- Vinland map
- Westford Knight
- Gwennan Gorn
- Burrows Cave
- Carroll L. Riley; J. Charles Kelley; Campbell W. Pennington; Robert L. Rands (2014). Man Across the Sea: Problems of Pre-Columbian Contacts. University of Texas Press. p. 9. ISBN 978-1-4773-0478-5.
- Lizzie Wade (August 10, 2017). "Most archaeologists think the first Americans arrived by boat. Now, they're beginning to prove it". Science.
- Linda S. Cordell; Kent Lightfoot; Francis McManamon; George Milner (2008). Archaeology in America: An Encyclopedia [4 volumes]: An Encyclopedia. ABC-CLIO. pp. 82–83. ISBN 978-0-313-02189-3.
- Kehoe, Alice Beck (2003). "The Fringe of American Archaeology: Transoceanic and Transcontinental Contacts in Prehistoric America" (PDF). Journal of Scientific Exploration. 17 (1): 19–36.[unreliable source?]
- Garrett G. Fagan (2006). Archaeological Fantasies: How Pseudoarchaeology Misrepresents the Past and Misleads the Public. Psychology Press. p. 405. ISBN 978-0-415-30592-1.
- S. A. Wurm; Peter Mühlhäusler; Darrell T. Tyron (1996). Atlas of Languages of Intercultural Communication in the Pacific, Asia, and the Americas. Walter de Gruyter. p. 1048. ISBN 978-3-11-013417-9.
- John Logan Allen (2007). North American Exploration. U of Nebraska Press. p. 27. ISBN 978-0-8032-1015-8.
- Axel Kristinsson (2010). Expansions: Competition and Conquest in Europe Since the Bronze Age. ReykjavíkurAkademían. p. 216. ISBN 978-9979-9922-1-9.
- Kirsten A. Seaver (2014). The Last Vikings: The Epic Story of the Great Norse Voyagers. I.B.Tauris. p. 63. ISBN 978-1-78453-057-0.
- Jordan Paper (August 1993). "A Material Case for a Late Bering Strait Crossing Coincident with Pre-Columbian Trans-Pacific Crossings". Sino-Platonic Papers (39). Retrieved August 3, 2018.
- Vajda, Edward. "The Siberian Origins of Native Americans".
- Owen Jarus (April 16, 2015). "Evidence of Pre-Columbus Trade Found in Alaska House". www.livescience.com. Retrieved August 3, 2018.
- "Old World metals were traded on Alaska coast several hundred years before contact with Europeans". Purdue University. 2016.
- Van Tilburg, Jo Anne. 1994. Easter Island: Archaeology, Ecology and Culture. Washington D.C.: Smithsonian Institution Press
- Langdon, Robert (2001). "The Bamboo Raft as a Key to the Introduction of the Sweet Potato in Prehistoric Polynesia". The Journal of Pacific History. 36 (1): 51–76. doi:10.1080/00223340123312.
- Montenegro, Álvaro; Avis, Chris; Weaver, Andrew (2008). "Modeling the prehistoric arrival of the sweet potato in Polynesia". Journal of Archaeological Science. 35 (2): 355–367. doi:10.1016/j.jas.2007.04.004.
- Roullier, Caroline; et al. (January 22, 2013), "Historical collections reveal patterns of diffusion of sweet potato in Oceania obscured by modern plant movements and recombination", PNAS, 110 (6), pp. 2205–2210, Bibcode:2013PNAS..110.2205R, doi:10.1073/pnas.1211049110, PMC 3568323, PMID 23341603
- Greenhill, Simon J.; Clark, Ross; Biggs, Bruce (2010). "Entries for KUMALA.1 [LO] Sweet Potato (Ipomoea)". POLLEX-Online: The Polynesian Lexicon Project Online. Retrieved July 16, 2013.
- Willem F. H. Adelaar; Pieter C. Muysekn (June 10, 2004). "Genetic relations of South American Indian languages". The Languages of the Andes. Cambridge University Press. p. 41. ISBN 978-1-139-45112-3.
- "28801_April08.indd" (PDF). York.ac.uk. December 2, 2010. Retrieved February 3, 2011.[permanent dead link]
- From the University of York Magazine, page 9, April/May 2008
- Did ancient Polynesians visit California? Maybe so., San Francisco Chronicle
- Jones, Terry L.; Kathryn A. Klar (June 3, 2005). "Diffusionism Reconsidered: Linguistic and Archaeological Evidence for Prehistoric Polynesian Contact with Southern California". American Antiquity. 70 (3): 457–484. doi:10.2307/40035309. JSTOR 40035309. Archived from the original (– Scholar search) on September 27, 2006. Retrieved March 6, 2008. and Adams, James D.; Cecilia Garcia; Eric J. Lien (January 23, 2008). "A Comparison of Chinese and American Indian (Chumash) Medicine". Evidence-based Complementary and Alternative Medicine. 7 (2): 219–25. doi:10.1093/ecam/nem188. PMC 2862936. PMID 18955312. Archived from the original on February 14, 2009. Retrieved March 6, 2008.. See also Terry Jones's homepage Archived May 11, 2008, at the Wayback Machine, California Polytechnic State University.
- For the argument against the Chumash—Polynesian contact theory, see Arnold, J.E. (2007). "Credit Where Credit is Due: The History of the Chumash Oceangoing Plank Canoe". American Antiquity. 72 (2): 196–209. doi:10.2307/40035811. JSTOR 40035811.
- Arnold, Jeanne E. (ed.) 2001. The Origins of a Pacific Coast Chiefdom: The Chumash of the Channel Islands. Salt Lake City: University of Utah Press.
- Gamble, Lynn H. (2002). "Archaeological Evidence for the Origin of the Plank Canoe in North America". American Antiquity. 67 (2): 301–315. doi:10.2307/2694568. JSTOR 2694568.
- Storey, A. A.; Ramirez, J. M.; Quiroz, D.; Burley, D. V.; Addison, D. J.; Walter, R.; Anderson, A. J.; Hunt, T. L.; Athens, J. S.; Huynen, L.; Matisoo-Smith, E. A. (2007). "Radiocarbon and DNA evidence for a pre-Columbian introduction of Polynesian chickens to Chile". Proceedings of the National Academy of Sciences. 104 (25): 10335–10339. Bibcode:2007PNAS..10410335S. doi:10.1073/pnas.0703993104. PMC 1965514. PMID 17556540.
- Whipps, Heather (June 4, 2007). "Chicken Bones Suggest Polynesians Found Americas Before Columbus". Live Science. Retrieved June 5, 2007.
- "Top 10 Discoveries of 2007 – Polynesian Chickens in Chile – Archaeology Magazine Archive". archaeology.org.
- Gongora, J.; Rawlence, N. J.; Mobegi, V. A.; Jianlin, H.; Alcalde, J. A.; Matus, J. T.; Hanotte, O.; Moran, C.; Austin, J. J.; Ulm, S.; Anderson, A. J.; Larson, G.; Cooper, A. (2008). "Indo-European and Asian origins for Chilean and Pacific chickens revealed by mtDNA". Proceedings of the National Academy of Sciences. 105 (30): 10308–10313. Bibcode:2008PNAS..10510308G. doi:10.1073/pnas.0801991105. PMC 2492461. PMID 18663216.
- Thomson, Vicki A; Lebrasseur, Ophélie; Austin, Jeremy J.; Hunt, Terry L.; Burney, David A.; Denham, Tim; Rawlence, Nicolas J.; Wood, Jamie R.; Gongor, Jaime; Flink, Linus Girdland; Linderholm, Anna; Dobney, Keith; Larson, Greger; Cooper, Alan (April 1, 2014). "Using ancient DNA to study the origins and dispersal of ancestral Polynesian chickens across the Pacific". Proceedings of the National Academy of Sciences of the United States of America. 111 (13): 4826–4831. Bibcode:2014PNAS..111.4826T. doi:10.1073/pnas.1320412111. PMC 3977275. PMID 24639505.
- Hillebrand, William (1888). Flora of the Hawaiian Islands. London: Williams and Norgate.
- Brown, Forest B. H. (1935). "Flora of Southeastern Polynesia, III. Dicotyledons". Bishop Museum Bulletin, Honolulu. 130.
- Tessman, Günter (1930). Die Indianer Nordost-Perus. Hamburg: Friederichsen, de Gruyter, & Co. pp. 161, 324.
- Tessman, Günter (1928). Menschen ohne Gott : ein Besuch bei den Indianern des Ucayali. Stuttgart: Strecker und Schroder.
- Sopher, David E. (1950). Turmeric in the Color Symbolism of Southern Asia and the Pacific Islands. Berkeley California: M.A. Thesis, University of California, Berkeley. p. 88.
- Lawler, Andrew (June 11, 2010). "Beyond Kon-Tiki: Did Polynesians Sail to South America?". Science. 328 (5984): 1344–1347. Bibcode:2010Sci...328.1344L. doi:10.1126/science.328.5984.1344. PMID 20538927.
- Lie, B. A.; Dupuy, B. M.; Spurkland, A.; Fernández-Viña, M. A.; Hagelberg, E.; Thorsby, E. (2007). "Molecular genetic studies of natives on Easter Island: evidence of an early European and Amerindian contribution to the Polynesian gene pool". Tissue Antigens. 69 (1): 10–18. doi:10.1111/j.1399-0039.2006.00717.x. PMID 17212703.
- Thorsby, E.; Flåm, S. T.; Woldseth, B.; Dupuy, B. M.; Sanchez-Mazas, A.; Fernandez-Vina, M. A. (2009). "Further evidence of an Amerindian contribution to the Polynesian gene pool on Easter Island". Tissue Antigens. 73 (6): 582–5. doi:10.1111/j.1399-0039.2009.01233.x. PMID 19493235.
- Westerholm, Russell (October 24, 2014). "Easter Island Was Not Populated Solely by the Polynesians, According to New Genetic Study". University Herald. Retrieved December 24, 2014.
- Vanessa Faria Gonçalves; Jesper Stenderup; Cláudia Rodrigues-Carvalho; Hilton P. Silva; Higgor Gonçalves-Dornelas; Andersen Líryo; Toomas Kivisild; Anna-Sapfo Malaspinas; Paula F. Campos; Morten Rasmussen; Eske Willerslev; Sergio Danilo J. Pena (2013). "Identification of Polynesian mtDNA haplogroups in remains of Botocudo Amerindians from Brazil". Proceedings of the National Academy of Sciences of the United States of America. 110 (16): 6465–6469. Bibcode:2013PNAS..110.6465G. doi:10.1073/pnas.1217905110. PMC 3631640. PMID 23576724.
- Pontus Skoglund; Swapan Mallick; Maria Cátira Bortolini; Niru Chennagiri; Tábita Hünemeier; Maria Luiza Petzl-Erler; Francisco Mauro Salzano; Nick Patterson; David Reich (July 2015). "Genetic evidence for two founding populations of the Americas". Nature. 525 (7567): 104–8. Bibcode:2015Natur.525..104S. doi:10.1038/nature14895. PMC 4982469. PMID 26196601.
- Skoglund, P.; Reich, D. (2016). "A genomic view of the peopling of the Americas". Current Opinion in Genetics & Development. 41: 27–35. doi:10.1016/j.gde.2016.06.016. PMC 5161672. PMID 27507099.
- Raghavan, M; Steinrucken, M; Harris, K; Schiffels, S; Rasmussen, S; Degiorgio, M; Albrechtsen, A; Valdiosera, C; Avila-Arcos, M. C; Malaspinas, A.-S; Eriksson, A; Moltke, I; Metspalu, M; Homburger, J. R; Wall, J; Cornejo, O. E; Moreno-Mayar, J. V; Korneliussen, T. S; Pierre, T; Rasmussen, M; Campos, P. F; Damgaard, P. d. B; Allentoft, M. E; Lindo, J; Metspalu, E; Rodriguez-Varela, R; Mansilla, J; Henrickson, C; Seguin-Orlando, A; et al. (July 2015). "Genomic evidence for the Pleistocene and recent population history of Native Americans". Science. 349 (6250): aab3884. doi:10.1126/science.aab3884. PMC 4733658. PMID 26198033.
- Roewer, Lutz; Nothnagel, Michael; Gusmão, Leonor; Gomes, Veronica; González, Miguel; Corach, Daniel; Sala, Andrea; Alechine, Evguenia; Palha, Teresinha; Santos, Ney; Ribeiro-Dos-Santos, Andrea; Geppert, Maria; Willuweit, Sascha; Nagy, Marion; Zweynert, Sarah; Baeta, Miriam; Núñez, Carolina; Martínez-Jarreta, Begoña; González-Andrade, Fabricio; Fagundes De Carvalho, Elizeu; Da Silva, Dayse Aparecida; Builes, Juan José; Turbón, Daniel; Lopez Parra, Ana Maria; Arroyo-Pardo, Eduardo; Toscanini, Ulises; Borjas, Lisbeth; Barletta, Claudia; Ewart, Elizabeth; et al. (2013). "Continent-Wide Decoupling of Y-Chromosomal Genetic Variation from Language and Geography in Native South Americans". PLOS Genetics. 9 (4): e1003460. doi:10.1371/journal.pgen.1003460. PMC 3623769. PMID 23593040.
- Pool, p. 92, who cites Gordon Ekholm (1964) "Transpacific Contacts" in Prehistoric Man in the New World JD Jennings and E. Norbeck, eds., Chicago: University of Chicago, pp. 489—510.
- This theory is mentioned in the history book The Rise of the West: A History of the Human Community (1963) by William H. McNeill
- Xu, Origin of the Olmec civilization.
- Dr. Mike Xu's Transpacific website Archived August 2, 2001, at the Wayback Machine, comparing Olmec and Chinese Shang period artifacts.
- David C. Grove (1976) "Olmec origins and transpacific diffusion: reply to Meggers" 
- Dean, James (January 1884). "Anthropology". The American Naturalist. 18 (1): 98–99. doi:10.1086/273578. JSTOR 2450831.
- Keddie, Grant (1990). "The Question of Asiatic Objects on the North Pacific Coast of North America: Historic or Prehistoric?" (PDF). Contributions to Human History. Royal British Columbia Museum (3). ISSN 0832-8609. Retrieved February 8, 2020.
- Anonymous (1892). "The Land of Fu-Sang,' Science 20:148; reprinted in William R. Corliss, ed. (1978) Ancient Man: A Handbook of Puzzling Artifacts, Glen Arm, Maryland: Sourcebook Project, ISBN 0-915554-03-8 p. 767
- Feder, Kenneth L. (1999). Frauds, Myths and Mysteries (Third ed.). Mayfield. pp. 103–104. ISBN 978-0-7674-0459-4.
- Menzies, Gavin. 1421: The Year China Discovered the World (Transworld Publishers, 2003).
- "The 1421 myth exposed". Archived from the original on March 18, 2018. Retrieved March 22, 2007.
- "Zheng He in the Americas and Other Unlikely Tales of Exploration and Discovery". Archived from the original on March 17, 2007. Retrieved March 22, 2007.
- "1421: The Year China Discovered the World by Gavin Menzies". Archived from the original on July 5, 2003. Retrieved March 22, 2007.
- Finlay, Robert (2004). "How Not to (Re)Write World History: Gavin Menzies and the Chinese Discovery of America" (PDF). Journal of World History. 15 (2): 229–242. doi:10.1353/jwh.2004.0018. Archived from the original (PDF) on November 9, 2013.
- Feder, Kenneth L. (2010). Encyclopedia of Dubious Archaeology: From Atlantis to the Walam Olum. Westport, CN: Greenwood. page 209. ISBN 978-0-313-37919-2
- Estrada, E; Meggers, BJ; Evans, C (1962). "Possible Transpacific Contact on the Coast of Ecuador". Science. 135 (3501): 371–2. Bibcode:1962Sci...135..371E. doi:10.1126/science.135.3501.371. PMID 17782632.
- Evans, Clifford; Meggers, Betty (January 1966). "A Transpacific Contact in 3000BC". Scientific American. 214 (1): 28. Bibcode:1966SciAm.214a..28M. doi:10.1038/scientificamerican0166-28.
- Valdivia, Jomon Fishermen, and the Nature of the North Pacific: Some Nautical Problems with Meggers, Evans, and Estrada's (1965) Transoceanic Contact Thesis Gordon F. McEwan, D. Bruce Dickson American Antiquity, Vol. 43, No. 3 (Jul. 1978), pp. 362–371.
- Prehistory of the Americas By Stuart J. Fiedel pp 188–189.
- Davis, Nancy Yaw (200). The Zuni Enigma. W. W. Norton & Company. ISBN 0-393-32230-0, ISBN 978-0-393-32230-9
- Wickersham, James (1892). "Origin of the Indians--The Polynesian Route." American Antiquarian, 16:323-335, partly reprinted in William R. Corliss, ed. (1978) Ancient Man: A Handbook of Puzzling Artifacts, Glen Arm, Maryland: Sourcebook Project, ISBN 0-915554-03-8 pp. 705-709
- "Japanese Castaways of 1834: The Three Kichis - HistoryLink.org". www.historylink.org. Retrieved January 30, 2018.
- Banse, Tom. "Japanese Retrace Path Of History-Making Castaways, 180 Years Later". Retrieved January 30, 2018.
- Cunningham, Alexander (1879). The Stupa of Bharhut. London: W.H.Allen. p. 47.
- Pokharia, Anil Kumar; Sekar, B.; Pal, Jagannath; Srivastava, Alka (2009). "Possible evidence of pre-Columbian transoceanic voyages based on conventional LSC and AMS 14C dating of associated charcoal and a carbonized seed of custard apple (Annona squamosa L.)". Radiocarbon. 51 (3): 923–930. doi:10.1017/S0033822200033993.
- Yetts, W. Perceval (1924). "Elephants and Maya Art". The Burlington Magazine for Connoisseurs. 45 (261): 262–265, 268–269. JSTOR 862358.
- Johannessen, Carl L.; Parker, Anne Z. (1989). "Maize ears sculptured in 12th and 13th century A.D. India as indicators of pre-columbian diffusion". Economic Botany. 43 (2): 164–180. doi:10.1007/bf02859857.
- Payak, M.M.; Sachan, J.K.S (1993). "Maize ears not sculpted in 13th century Somnathpur temple in India". Economic Botany. 47 (2): 202–205. doi:10.1007/BF02862023.
- Veena, T.; Sigamani, N. (1991). "Do objects in friezes of Somnathpur temple (1286 AD) in South India represent maize ears?" (PDF). Current Science. 61 (6): 395–397.
- John L. Sorenson, Carl L. Johannessen, Scientific Evidence for Pre-Columbian Transoceanic Voyages, Sino-Platonic Papers, Department of East Asian Languages and Civilizations, University of Pennsylvania, no.133, 2004
- Stirling, p. 2, who cites Melgar, Jose (1869) "Antigüedades mexicanas, notable escultura antigua", in Boletín de la Sociedad Mexicana de Geografía y Estadística, época 2, vol. 1, pp. 292–297, Mexico, as well as Melgar, Jose (1871) "Estudio sobre la antigüedad y el origen de la Cabeza Colosal de tipo etiópico que existe en Hueyapan del cantón de los Tuxtlas" in Boletín de la Sociedad Mexicana de Geografía y Estadística, época 2, vol. 3, pp. 104–109; Mexico.
- "CA Forum on Anthropology in Public: Robbing Native Cultures: Van Sertima's Afrocentricity and the Olmecs," in Current Anthropology, Vol. 38, no. 3 (June 1997), 419–441.
- Leo Wiener, Africa and the Discovery of America, Philadelphia, p. 259, Inness and Sons, 1922, Vol 3.
- Leo Wiener, Africa and the Discovery of America, American Anthropologist, New Series, Vol. 23, No. 1 (Jan. - Mar. 1921), pp. 83–94.
- Joan Baxter (December 13, 2000). "Africa's 'greatest explorer'". BBC News. Retrieved February 12, 2008.
- Morison, Samuel Eliot (1963). Journals & Other Documents on the Life & Voyages of Christopher Columbus. New York: The Heritage Press. pp. 262, 263.
- Thacher, John Boyd (1903). Christopher Columbus: his life, his work, his remains, as revealed by original printed and manuscript records, together with an essay on Peter Martyr of Anghera and Bartolomé De Las Casas, the first Historians of America. New York: G. P. Putnam's Sons. pp. 379, 380.
- Olson, Julius E.; Bourne, Edward Gaylord, eds. (1906). The Northmen, Columbus and Cabot, 985-1503. New York City: Charles Scribner's Sons – via Project Gutenberg.
- Romero, Simon (March 27, 2014). "Discoveries Challenge Beliefs on Humans' Arrival in the Americas". The New York Times. Retrieved December 4, 2014.
- Qiong Zhang (June 5, 2015). Making the New World Their Own: Chinese Encounters with Jesuit Science in the Age of Discovery. Brill. pp. 134–135. ISBN 9789004284388.
- Joseph Needham & Colin A. Ronan (1986). The Shorter Science and Civilisation in China. 3. Cambridge University Press. pp. 119–20. ISBN 978-0-521-31560-9.
- Hui-lin Li; Li, Hui-lin (1960–1961). "Mu-lan-p'i: A Case for Pre-Columbian Transatlantic Travel by Arab Ships". Harvard Journal of Asiatic Studies. 23: 114–126. doi:10.2307/2718572. JSTOR 2718572.
- Joseph Needham & Colin A. Ronan (1986). The Shorter Science and Civilisation in China. 3. Cambridge University Press. p. 120. ISBN 978-0-521-31560-9.
- Tabish Khair (2006). Other Routes: 1500 Years of African and Asian Travel Writing, p. 12. Signal Books. ISBN 1-904955-11-8
- Ali al-Masudi (940). Muruj Adh-Dhahab (The Book of Golden Meadows), Vol. 1, p. 268.
- Jason Colavito (June 22, 2013). "Did Columbus Find an Ancient Mosque in Cuba?".
- Scott, J. M. 2005. Geography in Early Judaism and Christianity. Cambridge University Press, pp. 182–183.
- McMenamin, M. A. 1997. The Phoenician World Map. Mercator's World 2(3): 46–51.
- McMenamin, Mark A. (2000). Phoenicians, Fakes and Barry Fell: Solving the Mystery of Carthaginian Coins Found in America. Meanma Press. p. 22. ISBN 978-1-893882-01-0. Retrieved February 8, 2020.
The putative Carthaginian coins must now be removed from the body admissible evidence favoring a pre-Columbian transatlantic crossing. It gives me some chagrin to admit this, as I ha4 earlier come out mildly in support of the authenticity of these coins (McMenamin 1999b, 2000a, 2000b). Weak evidence (involving measurements of die axis; the Arkansas coin has a die axis [33 degrees] differing from the Alabama type coins [12 to 20 degrees]) in support of the authenticity of these coins (McMenamin 2000b) is superseeded by the strong evidence in the current work.
- Biblical Archaeology Review, July–August 1993.
- McCulloch, Huston. "The Bat Creek Stone". OSU Arts and Sciences. Ohion State University. Retrieved July 31, 2019.
- Ungar-Sargon, Batya (February 27, 2013). "The Mystery Stone". Tablet Magazine. Tablet Magazine. Retrieved July 31, 2019.
- Pace, Eric (April 9, 2001). "Cyrus Gordon, Scholar of Ancient Languages, Dies at 92". The New York Times.
- Robert C. Mainfort, Jr., and Mary L. Kwas, "The Bat Creek Stone: Judeans In Tennessee?" Tennessee Anthropologist Vol. XVI, No. 1, Spring 1991 Archived August 16, 2007, at the Wayback Machine
- Cyrus Herzl Gordon, Before Columbus; links between the Old World and ancient America, Crown, 1971, p. 138
- Weigand, Phil C. (1978). "Review of In Search of Noah's Ark by Dave Balsiger; Charles E. Sellier,; Remote Kingdoms by Tertius Chandler; The Key by John Philip Cohane; Gods of the Cataclysm: A Revolutionary Investigation of Man and his Gods before and after the Great Cataclysm by Hugh Fox". American Anthropologist. 80 (3): 731–733. doi:10.1525/aa.1978.80.3.02a00760.
- Bradley, Bruce; Stanford, Dennis (2004). "The North Atlantic ice-edge corridor: a possible Palaeolithic route to the New World" (PDF). World Archaeology. 36 (4): 459–478. CiteSeerX 10.1.1.694.6801. doi:10.1080/0043824042000303656.
- Carey, Bjorn (February 19, 2006). "First Americans may have been European". Live Science.
- Meltzer, David J. (2009). First Peoples in the New World, Berkeley: University of California Press, 2009, p. 188
- Fagundes, Nelson J.R.; Kanitz, Ricardo; Eckert, Roberta; et al. (2008). "Mitochondrial Population Genomics Supports a Single Pre-Clovis Origin with a Coastal Route for the Peopling of the Americas". American Journal of Human Genetics. 82 (3): 583–592. doi:10.1016/j.ajhg.2007.11.013. PMC 2427228. PMID 18313026.
- Kashani, Baharak Hooshia; Perego, Ugo A.; Olivieri, Anna; et al. (January 2012). "Mitochondrial haplogroup C4c: A rare lineage entering America through the ice-free corridor?". American Journal of Physical Anthropology. 147 (1): 34–39. doi:10.1002/ajpa.21614. PMID 22024980.
Recent analyses of mitochondrial genomes from Native Americans have brought the overall number of recognized maternal founding lineages from just four to a current count of 15. However, because of their relative low number, almost nothing is known about some of these lineages. This leaves a considerable void in understanding the events that led to the colonization of the Americas following the Last Glacial Maximum (LGM). In this study, we identified and completely sequenced 14 mitochondrial DNAs belonging to one extremely rare Native American lineage known as haplogroup C4c. Its age and geographical distribution raise the possibility that C4c marked the Paleo-Indian group(s) that entered North America from Beringia through the ice-free corridor between the Laurentide and Cordilleran ice sheets. The similarities in ages and geographical distributions for C4c and the previously analyzed X2a lineage provide support to the scenario of a dual origin for Paleo-Indians.
- Hristov, Romeo H.; Genovés T., Santiago (1999), "Mesoamerica evidence of pre-Columbian transoceanic contacts", Ancient Mesoamerica, 10 (2): 207–213, doi:10.1017/S0956536199102013
- Jashemski, Wilhelmina (2002). The natural history of Pompeii. Cambridge University Press. p. 81. ISBN 978-0-521-80054-9.
- Forbes, Jack D. The American Discovery of Europe University of Illinois Press; April 16, 2007 ISBN 978-0-252-03152-6 p.108
- Hristov and Genovés (1999).
- Smith, Michael E., "The 'Roman Figurine' Supposedly Excavated at Calixtlahuaca". Accessed: February 13, 2012. (Archived by WebCite at https://www.webcitation.org/65PlUfqJr)
- Steffy, J. Richard (January 1985). "The Kyrenia Ship: An Interim Report on Its Hull Construction". American Journal of Archaeology. 89 (1): 71–101. doi:10.2307/504772. JSTOR 504772.
- "Earl Henry Sinclair". Orkneyjar. Retrieved February 3, 2011.
- Johann Reinhold Forster, History of the Voyages and Discoveries Made in the North, Printed for G.G.J. and J. Robinson, London, 1786
- T. J. Oleson, "ZENO, NICOLÒ," in Dictionary of Canadian Biography, vol. 1, University of Toronto/Université Laval, 2003–, accessed October 1, 2014
- Christopher Knight and Robert Lomas. The Hiram Key. Fair Winds Press, 2001 ISBN 1-931412-75-8.
- Turnbull, Michael TRB (August 6, 2009). "Rosslyn Chapel". BBC. Retrieved December 14, 2016.
- Mark Oxbrow & I. Robertson. Rosslyn and the Grail. Mainstream Publishing, 2005 ISBN 1-84596-076-9.
- Historian Mark Oxbrow, quoted in "The ship of dreams" by Diane MacLean, Scotsman.com, May 13, 2005
- "It is most probable that Columbus visited Bristol, where he was introduced to English commerce with Iceland." Bedini, Silvio A. and David Buisseret (1992). The Christopher Columbus encyclopedia, Volume 1, University of Michigan press, republished by Simon & Schuster, ISBN 0-13-142670-2, p. 175.
- Seaver (1995) p.222
- Seaver, K.A.(1995) The Frozen Echo Stanford University Press ISBN 0-8047-3161-6 p. 221.
- Columbus, Christopher; Cohen, J. M. (translator) (May 5, 1992). The Four Voyages, pp. 27–37. New York: Penguin Books. ISBN 0-14-044217-0.
- Soren, Larsen. (1925) The Pining voyage: The Discovery of North America Twenty Years Before Columbus.
- Thomas L. Hughes, The German Discovery of America: A Review of the Controversy over Didrik Pining's Voyage of Exploration in 1473 in the North Atlantic Archived September 27, 2007, at the Wayback Machine in: German Historical Institute Bulletin, No. 33 (Fall 2003)
- "El mito de que los balleneros vascos estuvieron en América antes que Cristóbal Colón". May 13, 2015.
- Howley, Andrew (May 16, 2013). "Did St. Brendan Reach North America 500 Years Before the Vikings? – National Geographic Society (blogs)". voices.nationalgeographic.com. Retrieved October 22, 2017.
- Williams, Gwyn A (1979): Madoc: The Making of a Myth. London: Eyre Methuen
- Sisson, David (September 1984)"Did the Irish discover America?". The Saturday Evening Post. Retrieved July 23, 2006.
- Kelley, D. H. (Spring 1990). "Proto-Tifinagh and Proto-Ogham in the Americas: Review of Fell; Fell and Farley; Fell and Reinert; Johannessen, et al.; McGlone and Leonard; Totten". The Review of Archaeology. 11 (1). Archived from the original on July 9, 2008.
I have no personal doubts that some of the inscriptions which have been reported [in the Americas] are genuine Celtic ogham. [...] Despite my occasional harsh criticism of Fell's treatment of individual inscriptions, it should be recognized that without Fell's work there would be no [North American] ogham problem to perplex us. We need to ask not only what Fell has done wrong in his epigraphy, but also where we have gone wrong as archaeologists in not recognizing such an extensive European presence in the New World.
- Oppenheimer, Monroe; Wirtz, Willard (Spring 1989). "A Linguistic Analysis of Some West Virginia Petroglyphs". The West Virginia Archeologist. 41 (1).
- "Curse of the Cocaine Mummies" written and directed by Sarah Marris. (Producers: Hilary Lawson, Maureen Lemire and narrated by Hilary Kilberg). A TVF Production for Channel Four in association with the Discovery Channel, 1997.
- "A look at the Evidence for Cocaine in Mummies". Thehallofmaat.com. Retrieved February 14, 2020.
- "The Stoned Age?". Hall of Maat. Retrieved February 3, 2011.
- Buckland, P.C.; Panagiotakopulu, E. "Rameses II and the tobacco beetle". Antiquity. 75 (549–56): 2001.
- Counsell, D. C., "Intoxicants in Ancient Egypt? Opium, nymphea, coca, and tobacco," in David, Ann Rosalie, ed. Egyptian Mummies and Modern Science, Cambridge University Press, 2008, ISBN 978-0-521-86579-1 p.213
- Bucaille, M. Mummies of the Pharaohs: Modern Medical Investigations NY: St. Martin's Press pp 186-188
- Ebenesersdóttir, Sigríður Sunna; Sigurðsson, Ásgeir; Sánchez-Quinto, Federico; Lalueza-Fox, Carles; Stefánsson, Kári; Helgason, Agnar (2011). "A new subclade of mtDNA haplogroup C1 found in icelanders: Evidence of pre-columbian contact?". American Journal of Physical Anthropology. 144 (1): 92–9. doi:10.1002/ajpa.21419. PMID 21069749.
- Der Sarkissian, Clio; Brotherton, Paul; Balanovsky, Oleg; Templeton, Jennifer E. L.; Llamas, Bastien; Soubrier, Julien; Moiseyev, Vyacheslav; Khartanovich, Valery; Cooper, Alan; Haak, Wolfgang (2014). "Mitochondrial Genome Sequencing in Mesolithic North East Europe Unearths a New Sub-Clade within the Broadly Distributed Human Haplogroup C1". PLOS One. 9 (2): e87612. Bibcode:2014PLoSO...987612D. doi:10.1371/journal.pone.0087612. PMC 3913659. PMID 24503968.
- Eirik the Red's Saga by John Sephton paragraph 14
- Forbes, Jack D. (2007). The American Discovery of Europe. University of Illinois Press. p. 163. ISBN 978-0-252-03152-6. Retrieved December 20, 2011.
- Forbes, Jack D. (1993). Africans and Native Americans: The Language of Race and the Evolution of Red-Black Peoples. University of Illinois Press. pp. 18–21. ISBN 978-0-252-06321-3. Retrieved December 20, 2011.
- Seaver (1995), p. 208
- Fossett, Renée (2001). In Order to Live Untroubled: Inuit of the Central Arctic, 1550–1940. University of Manitoba Press. pp. 75–77. ISBN 978-0-88755-647-0.
- "The Peopling of the Aleutians". Science. 335 (6065). January 13, 2012. pp. 158–161. Bibcode:2012Sci...335..158B. doi:10.1126/science.335.6065.158.
- "Quetzalcóatl ¿blanco y de ojos azules?". June 28, 2016.
- León-Portilla, Miguel (1974). "Quetzalcóatl-Cortés en la Conquista de México". Historia Mexicana. 24 (1): 13–35. JSTOR 25135435.
- Riley, Carroll L.; Charles Kelley, J.; Pennington, Campbell W.; Rands, Robert L. (October 14, 2014). Man Across the Sea: Problems of Pre-Columbian Contacts. ISBN 9781477304785.
- "Native Americans and Jews: The Lost Tribes Episode".
- Oliver's Bookshelf, The Premier Web-Site for Early Mormon History Archived October 29, 2013, at the Wayback Machine
- Parfitt, Tudor (2003). The Lost Tribes of Israel: The History of a Myth. Phoenix. p. 66.
- Parfitt, Tudor (2003). The Lost Tribes of Israel: The History of a Myth. Phoenix. pp. 66, 76.
- "National Geographic Society Statement on the Book of Mormon". August 12, 1998. Letter from Julie Crain addressed to Luke Wilson of the Institute for Religious Research.
- Givens, Terryl (January 1, 2004). The Latter-day Saint Experience i n America. Greenwood Publishing Group. pp. 145–. ISBN 978-0-313-32750-6. Retrieved November 8, 2014.
- *Brewer, Stewart W., (1999); "The History of an Idea: The Scene on Stela 5 from Izapa, Mexico, as a Representation of Lehi's Vision of the Tree of Life", (p. 12)
- Paulson, Matthew A. (September 1, 2000). Breaking the Mormon Code. WingSpan Press. pp. 236–. ISBN 978-1-59594-067-4. Retrieved November 8, 2014.
- Lund, John (November 22, 2007). MesoAmerica And The Book of Mormon. Granite Publishing & Distribution. p. 286. ISBN 978-1891114403.
- Allen, Joseph (June 15, 1989). Exploring the Lands of the Book of Mormon. S.A. Publishers. p. 437. ISBN 978-6877470597.
- Wirth, Diane (August 1, 2007). Decoding Ancient America: A Guide to the Archaeology of the Book of Mormon. Horizon Publishers, an Imprint of Cedar Fort, Inc. pp. 150–. ISBN 978-0882908205.
- Ashe, Geoffrey, The Quest for America (New York: Praeger Publishers, 1971);
- Blench, Roger (2010). "Remapping the Austronesian expansion". In Evans, Bethwyn (ed.). Festschrift for Malcolm Ross (PDF). Canberra: Pacific Linguistics. pp. 1–25. Retrieved August 5, 2013.
- Fagan, Brian M. The Great Journey. Thames and Hudson. (1987)
- Feder, Kenneth L. (1999) "Frauds, myths, and mysteries: science and pseudoscience in archaeology" (3rd ed., Mountain View, Calif. : Mayfield Pub. Co.
- Fell, Barry (1984) America B.C.: Ancient Settlers in the New World (New York: Simon & Schuster, 1984)
- William J. Hamblim Archaeology and the Book of Mormon (Provo, Utah: Maxwell Institute, 1993), Volume 5, Issue 1, pp. 250–272, Text ;
- Gerol, E. Harry Dioses, Templos y Ruinas.
- Guernsey, Julia (2006) Ritual and Power in Stone: The Performance of Rulership in Mesoamerican Izapan Style Art, University of Texas Press, Austin, Texas, ISBN 978-0-292-71323-9.
- Hey, J. (2005). "On the number of New World founders: A population genetic portrait of the peopling of the Americas". PLOS Biology. 3 (6): e193. doi:10.1371/journal.pbio.0030193. PMC 1131883. PMID 15898833.
- Howgaard, William (1971) The Voyages of the Norsemen to America (New York: The American-Scandinavian Foundation, 1914, Kraus Reprint Co., 1971);
- Hristov, Romeo H. and Santiago Genovés T. (2001) "The Roman Head from Tecaxic-Calixtlahuaca, Mexico: A Review of the evidence", Paper prepared for the 66th—Annual Meeting of the Society for American Archaeology, New Orleans (2001).
- Huyghe, Patrick (1992) Columbus was Last: A Heretical History of who was First (New York: Hyperion, 1992; Anomalist Books, 2005)
- Ingstad, Helge Westward to Vinland (New York: St. Martins, 1969);
- Johnson, Adrian America Explored (New York: The Viking Press, 1974);
- Jones, Gwyn A History of the Vikings (Oxford University Press, 1984);
- Jones, Peter N. American Indian mtDNA, Y Chromosome Genetic Data, and the Peopling of North America. Boulder: Bauu Press. 2004;
- Lawrence, Harold G. (1962). African Explorers of the New World. John Henry and Mary Louisa Dunn Bryant Foundation. ASIN B0007HV7US.
- Arlington Mallery and Mary Roberts Harrison, The Rediscovery of Lost America (New York: E.P. Dutton, 1979);
- Marcus, G. J., "The Conquest of the North Atlantic" (New York: Oxford University Press, 1980);
- Mowat, Farley (1998) The Farfarers (Toronto, Key Porter Books, 1998) ISBN 1-55013-989-4;
- Frederick J. Pohl, The Lost Discovery (New York: W.W. Norton & Co., 1952);
- Frederick J. Pohl, The Viking Explorers (New York: Thomas Y. Crowell Co., 1966);
- Gary A. Rendsburg, "'Someone Will Succeed in Deciphering Minoan': Minoan Linear A as a West Semitic Dialect," Biblical Archaeologist, 59:1 (1996), pp. 36–43, esp. p. 40.
- Seaver, K.A.(1995) The Frozen Echo: Greenland and the Exploration of North America ca A.D. 1000–1500 Stanford University Press ISBN 0-8047-3161-6
- Smith, Michael E. "The 'Roman Figurine' Supposedly Excavated at Calixtlahuaca", accessed December 2007.
- Sorenson, John L. and Johannessen, Carl L. (2006) "Biological Evidence for Pre-Columbian Transoceanic Voyages." In: Contact and Exchange in the Ancient World. Ed. Victor H. Mair. University of Hawai'i Press. Pp. 238–297. ISBN 978-0-8248-2884-4; ISBN 0-8248-2884-4
- Sorenson, John L.; Raish, Martin H. (1996) Pre-Columbian Contact with the Americas Across the Oceans: An Annotated Bibliography. 2v. 2d ed., rev., Provo, Utah: Research Press, ISBN 0-934893-21-7.
- Sorenson, John L. and Johannessen, Carl L. (2009) World Trade and Biological Exchanges Before 1492, Bloomington, IN: iUniverse, ISBN 978-0-595-52441-9;
- Stirling, Matthew (1967) "Early History of the Olmec Problem", in Dumbarton Oaks Conference on the Olmec, E. Benson, ed., Dumbarton Oaks, Washington, D.C.
- Van Sertima, Ivan (1976). They Came Before Columbus. Random House. ISBN 978-0-394-40245-1.
- Von Wuthenau, Alexander (1975). Unexpected Faces in Ancient America: The Historical Testimony of Pre-Columbian Artists. Crown Publishers. ISBN 978-0-517-51657-7.
- Wauchope, Robert (1962) Lost Tribes & Sunken Continents. University of Chicago Press.
- Williams, Stephen (1991) "Fantastic Archaeology: The Wild Side of North American Prehistory", Philadelphia: University of Pennsylvania Press, ISBN 0-8122-8238-8/0-8122-1312-2.
- Man across the sea: Problems of Pre-Columbian contacts (Austin and London: University of Texas Press, 1971).
- Report of Severin's trip in the National Geographic Magazine, Volume 152, Number 6 (December 1977).
|Wikimedia Commons has media related to Pre-Columbian trans-oceanic contact hypotheses.|