Bactria–Margiana Archaeological Complex
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The Bactria–Margiana Archaeological Complex (or BMAC, also known as the Oxus civilization) is the modern archaeological designation for a Bronze Age civilisation of Central Asia, dated to ca. 2300–1700 BCE, located in present day northern Afghanistan, eastern Turkmenistan, southern Uzbekistan and western Tajikistan, centered on the upper Amu Darya (Oxus River). Its sites were discovered and named by the Soviet archaeologist Viktor Sarianidi (1976). Bactria was the Greek name for the area of Bactra (modern Balkh), in what is now northern Afghanistan, and Margiana was the Greek name for the Persian satrapy of Margu, the capital of which was Merv, in modern-day southeastern Turkmenistan.
Sarianidi's excavations from the late 1970s onward revealed numerous monumental structures in many sites, fortified by impressive walls and gates. Reports on the BMAC were mostly confined to Soviet journals, until the last years of the Soviet Union, so the findings were largely unknown to the West until Sarianidi's work began to be translated in the 1990s.
There is archaeological evidence of settlement in the well-watered northern foothills of the Kopet Dag during the Neolithic period. This region is dotted with the multi-period hallmarks characteristic of the ancient Near East, similar to those southwest of the Kopet Dag in the Gorgan Plain in Iran. At Jeitun (or Djeitun), mudbrick houses were first occupied c. 6000 cal. BCE. The inhabitants were farmers who kept herds of goats and sheep and grew wheat and barley, with origins in southwest Asia. Jeitun has given its name to the whole Neolithic period in the northern foothills of the Kopet Dag. At the late Neolithic site of Chagylly Depe, farmers increasingly grew the kinds of crops that are typically associated with irrigation in an arid environment, such as hexaploid bread wheat, which became predominant during the Chalcolithic period.
During the Copper Age, the population of this region grew. Vadim Mikhaĭlovich Masson, who led the South Turkmenistan Complex Archaeological Expedition from 1946, sees signs that people migrated to the region from central Iran at this time, bringing metallurgy and other innovations, but thinks that the newcomers soon blended with the Jeitun farmers. By contrast a re-excavation of Monjukli Depe in 2010 found a distinct break in settlement history between the late Neolithic and early Chalcolithic eras there.
Major chalcolithic settlements sprang up at Kara-Depe and Namazga-Depe. In addition there were smaller settlements at Anau, Dashlyji, and Yassy-depe. Settlements similar to the early level at Anau also appeared further east– in the ancient delta of the River Tedzen, the site of the Geoksiur Oasis. About 3500 BCE the cultural unity of the culture split into two pottery styles: colourful in the west (Anau, Kara-Depe and Namazga-Depe) and more austere in the east at Altyn-Depe and the Geoksiur Oasis settlements. This may reflect the formation of two tribal groups. It seems that around 3000 BCE people from Geoksiur migrated into the Murghab Delta, where small, scattered settlements appeared, and reached further east into the Zerafshan Valley in Transoxiana. In both areas pottery typical of Geoksiur was in use. In Transoxiana they settled at Sarazm near Pendjikent. To the south the foundation layers of Shahr-i Shōkhta on the bank of the Helmand River in south-eastern Iran contained pottery of the Altyn-Depe and Geoksiur type. Thus the farmers of Iran, Turkmenistan and Afghanistan were connected by a scattering of farming settlements.
In the Early Bronze Age the culture of the Kopet Dag oases and Altyn-Depe developed a proto-urban society. This corresponds to level IV at Namazga-Depe. Altyn-Depe was a major centre even then. Pottery was wheel-turned. Grapes were grown. The height of this urban development was reached in the Middle Bronze Age c. 2300 BCE, corresponding to level V at Namazga-Depe. It is this Bronze Age culture which has been given the BMAC name.
The inhabitants of the BMAC were sedentary people who practised irrigation farming of wheat and barley. With their impressive material culture including monumental architecture, bronze tools, ceramics, and jewellery of semiprecious stones, the complex exhibits many of the hallmarks of civilization. The complex can be compared to proto-urban settlements in the Helmand basin at Mundigak in western Afghanistan and Shahr-i Shōkhta in eastern Iran, or at Harappa and Mohenjo-daro in the Indus Valley.
Sarianidi regards Gonur as the "capital" of the complex in Margiana throughout the Bronze Age. The palace of North Gonur measures 150 metres by 140 metres, the temple at Togolok 140 metres by 100 metres, the fort at Kelleli 3 125 metres by 125 metres, and the house of a local ruler at Adji Kui 25 metres by 25 metres. Each of these formidable structures has been extensively excavated. While they all have impressive fortification walls, gates, and buttresses, it is not always clear why one structure is identified as a temple and another as a palace. Mallory points out that the BMAC fortified settlements such as Gonur and Togolok resemble the qala, the type of fort known in this region in the historical period. They may be circular or rectangular and have up to three encircling walls. Within the forts are residential quarters, workshops and temples.
Extensive irrigation systems have been discovered at the Geoksiur Oasis.
Models of two-wheeled carts from c. 3000 BCE found at Altyn-Depe are the earliest complete evidence of wheeled transport in Central Asia, though model wheels have come from contexts possibly somewhat earlier. Judging by the type of harness, carts were initially pulled by oxen, or a bull. However camels were domesticated within the BMAC. A model of a cart drawn by a camel of c. 2200 BCE was found at Altyn-Depe.
The discovery of a single tiny stone seal (known as the "Anau seal") with geometric markings from the BMAC site at Anau in Turkmenistan in 2000 led some to claim that the Bactria-Margiana complex had also developed writing, and thus may indeed be considered a literate civilization. It bears five markings strikingly similar to Chinese "small seal" characters, but such characters date from the Qin reforms of roughly 100 AD, while the Anau seal is dated by context to 2,300 BCE. It is therefore an unexplained anomaly. The only match to the Anau seal is a small jet seal of almost identical shape from Niyä (near modern Minfeng) along the southern Silk Road in Xinjiang, assumed to be from the Western Han dynasty.
Interactions with other cultures
BMAC materials have been found in the Indus civilisation, on the Iranian plateau, and in the Persian Gulf. Finds within BMAC sites provide further evidence of trade and cultural contacts. They include an Elamite-type cylinder seal and an Harappan seal stamped with an elephant and Indus script found at Gonur-depe. The relationship between Altyn-Depe and the Indus Valley seems to have been particularly strong. Among the finds there were two Harappan seals and ivory objects. The Harappan settlement of Shortugai in Northern Afghanistan on the banks of the Amu Darya probably served as a trading station.
There is evidence of sustained contact between the BMAC and the Eurasian steppes to the north, intensifying c. 2000 BCE. In the delta of the River Amu Darya where it reaches the Aral Sea, its waters were channeled for irrigation agriculture by people whose remains resemble those of the nomads of the Andronovo Culture. This is interpreted as nomads settling down to agriculture, after contact with the BMAC. The culture they created is known as Tazabag'yad. About 1800 BCE the walled BMAC centres decreased sharply in size. Each oasis developed its own types of pottery and other objects. Also pottery of the Andronovo-Tazabag'yab culture to the north appeared widely in the Bactrian and Margian countryside. Many BMAC strongholds continued to be occupied and Andronovo-Tazabagyab coarse incised pottery occurs within them (along with the previous BMAC pottery) as well as in pastoral camps outside the mudbrick walls. In the highlands above the Bactrian oases in Tajikistan, kurgan cemeteries of the Vaksh and Bishkent type appeared with pottery that mixed elements of the late BMAC and Andronovo-Tazabagyab traditions.
As argued by Michael Witzel and Alexander Lubotsky, there is a proposed substratum in Proto-Indo-Iranian which can be plausibly identified with the original language of the BMAC. Moreover, Lubotsky points out a larger number of words apparently borrowed from the same language, which are only attested in Indo-Aryan and therefore evidence of a substratum in Vedic Sanskrit. Some of these proposed substratum words have now also been found in Tocharian. The loan words related to local fauna and agriculture is opined by Witzel to indicate acculturation to settled life. However, Michael Witzel asserts that his theory on supposed loans "would require far more intimate relationships between the Andronovo and the Bactrian Margiana complex than the existing distribution of 'mutually exclusive material culture would permit'" . He understands that for his theory to be plausible a more massive Indo Iranian (steppe) influx into the BMAC would be necessary. However, the archaeological evidence for this remains sketchy. See also Substratum in Vedic Sanskrit: Language of the BMAC.
Relationship with Indo-Iranians
The Bactria-Margiana complex has attracted attention as a candidate for those looking for the material counterparts to the Indo-Iranians, a major linguistic branch that split off from the Proto-Indo-Europeans. Sarianidi himself advocates identifying the complex as Indo-Iranian, describing it as the result of a migration from southwestern Iran. Bactrian Margiana material has been found at Susa, Shahdad, and Tepe Yahya in Iran, but Lamberg-Karlovsky does not see this as evidence that the complex originated in southeastern Iran. "The limited materials of this complex are intrusive in each of the sites on the Iranian Plateau as they are in sites of the Arabian peninsula."
A significant section of the archaeologists[who?] are more inclined to see the culture as begun by farmers in the Near Eastern Neolithic tradition, but infiltrated by Indo-Iranian speakers from the Andronovo culture in its late phase, creating a hybrid[dubious ]. In this perspective, a steppe migration into the Indian subcontinent and Iran would be impossible, had Proto-Indo-Iranian not necessarily developed within a "hypothetical" composite culture with both Andronovo and BMAC influences. As James P. Mallory phrased it
It has become increasingly clear that if one wishes to argue for Indo-Iranian migrations from the steppe lands south into the historical seats of the Iranians and Indo-Aryans that these steppe cultures were transformed as they passed through a membrane of Central Asian urbanism. The fact that typical steppe wares are found on BMAC sites and that intrusive BMAC material is subsequently found further to the south in Iran, Afghanistan, Nepal, India and Pakistan, may suggest then the subsequent movement of Indo-Iranian-speakers after they had adopted the culture of the BMAC.
However, it is very difficult to reconcile this view with the archaeological evidence presented by Sarianidi, which makes it clear that steppe penetration into the Bactria Margiana Archaeological Complex was a minimum and that it only extended to the borderlands between the northern regions of the complex and the southern steppe belt. Contact is indicated by some presence of Andronovo materials, but this could be indicative of peaceful trade as opposed to population displacement, especially since the complex reveals no signs of systematic destruction. CC Lamberg-Karlovsky notes that
Not a single artifact of Andronovo type has been identified in Iran or in northern India, but there is ample evidence for the presence of Bactrian Margiana materials on the Iranian Plateau and in Baluchistan. It is impossible, however, to trace the continuity of these materials into the 1st millennium and relate them to the known cultures of Iranian-speakers—the Medes or the Achaemenids 
To the effect of these findings, since there is a minimal effect on the Bactria Margiana Archaeological Complex by the Andronovo culture, and a non-existent effect on either the Indian subcontinent and the Iranian plateau, the only way to conform the linguistic hypotheses of Indo-Iranian expansion with the archaeological evidence is to assume the model of a "Kulturkegel". The migrants coming from the steppe completely discarded their Andronovo cultural associations and extensively adopted both Bactrian material and religious culture, while retaining their language with minimal substratum influence. This tedious "cultural bullet" model is invoked by JP Mallory  and would explain why Aryans had a massive linguistic influence (i.e. changing the hydronyms and toponyms of northern India [see Bryant, Edwin (2001)] yet express none of their original Andronovo identity in the South Asian archaeological cultures associated with them.
The Indian archaeologist B. B. Lal has seriously questioned the BMAC and Indo-Iranian connection, and disputed the proclaimed relations. Others maintain there is insufficient evidence for any ethnic or linguistic identification of the BMAC solely based on material remains, in the absence of written records.
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