Willamette Meteorite at the American Museum of Natural History
|Structural classification||Medium Octahedrite|
|Composition||91% Fe, 7.62% Ni, 18.6ppm Ga, 37.3ppm Ge, 4.7ppm Ir|
|TKW||14,150 kilograms (15.60 short tons)|
|Related media on Wikimedia Commons|
The Willamette Meteorite, officially named Willamette and originally known as Tomanowos by the Clackamas Chinook Native American tribe is an iron-nickel meteorite found in the U.S. state of Oregon. It is the largest meteorite found in North America and the sixth largest in the world. There was no impact crater at the discovery site; researchers believe the meteorite landed in what is now Canada or Montana, and was transported as a glacial erratic to the Willamette Valley during the Missoula Floods at the end of the last Ice Age (~13,000 years ago). It has long been held sacred by indigenous peoples of the Willamette Valley, including the federally recognized Confederated Tribes of the Grand Ronde Community of Oregon (CTGRC).
The meteorite is on display at the American Museum of Natural History in New York City, which acquired it in 1906. Having been seen by an estimated 40 million people over the years, and given its striking appearance, it is among the most famous meteorites. In 2005, the CTGRC sued to have the meteorite returned to their control, ultimately reaching an agreement that gave the tribe access to the meteorite while allowing the museum to keep it as long as they are exhibiting it.
Physical characteristics and formation
The Willamette Meteorite weighs about 34,200 pounds (15,500 kg). It is classified as a type III iron meteorite, being composed of over 91% iron and 7.62% nickel, with traces of cobalt and phosphorus. The approximate dimensions of the meteorite are 10 feet (3 m) tall by 6.5 feet (2 m) wide by 4.25 feet (1.3 m) deep. Most iron meteorites like Willamette have originated from the differentiated core of planetesimals or asteroids that collided with another object. Willamette has a recrystallized structure with only traces of a medium Widmanstätten pattern; it is the result of a significant impact-heating event on the parent body. The Willamette Meteorite contains higher concentrations of various metals that are quite rare in Earth's crust. For example, iridium, one of the least abundant elements in Earth's crust, is found in the Willamette Meteorite at a concentration of 4.7 ppm, thousands of times more concentrated than in the crust.
Emplacement and erosion
The lack of an impact crater at the discovery site was only explained after the 1920s, with the new understanding about the Missoula Floods, one of the largest floods documented, caused by the collapse of an ice barrier during the last deglaciation. The meteorite presumably landed on an ice cap in what is now Montana or western Canada, and was dragged by the glacier ice to the vicinity of an ice barrier that formed across the Clark Fork River. This barrier had ponded a huge amount of water at the Lake Missoula right at the time when the meteorite reached the area and the ice barrier became unstable and breached. The resulting flood involved up to 10 million cubic meters per second of water discharge, with large blocks of ice rafting down the Columbia River and the Willamette Valley at the end of the last Ice Age (~13,000 years ago). Some of these ice rafts included boulders (known as glacial erratics by geologists) like the Willamette meteorite, which eventually sank in the flood waters and settled where they were found by humans.
The deep crevasses of the meteorite resulted from both its high-speed atmospheric entry and its subsequent weathering. Exposed to the elements for thousands of years, rainwater interacted with the mineral troilite, resulting in a form of sulfuric acid which slowly dissolved portions of the meteorite. This resulted in the gradual development of the hollows that are visible today.
The Willamette Meteorite has been venerated by the Clackamas people since long before it was removed from is location in the Willamette Valley near the modern city of West Linn, Oregon. In 1902, Ellis Hughes was the first European settler to recognize the meteorite's significance. At that time the land was owned by the Oregon Iron and Steel Company. Hughes attempted to claim ownership of the meteorite, and secretly moved it to his own land. This involved 90 days of hard work to cover the 3/4 mile (1200 m) distance. The move was discovered, and after a lawsuit, the Oregon Supreme Court held that Oregon Iron and Steel Company was the legal owner.
In 1905, William E. Dodge purchased the meteorite for $26,000 (around $680,000 in 2011). After displaying it at the Lewis and Clark Centennial Exposition, he donated it to the American Museum of Natural History in New York City, where it has been on display since 1906.
The Clackamas people have long used the meteorite, which they call Tomanowos, in ceremonies. In 1999 the Confederated Tribes of the Grand Ronde Community of Oregon (CTGRC), a confederation of Native American tribes, demanded that it be returned and filed an action pursuant to the Native American Graves Protection and Repatriation Act (NAGPRA) against the American Museum of Natural History. In response, the Museum filed a federal lawsuit seeking a declaratory judgment against the CTGRC in 2000. An agreement with the Museum was reached later that year in which the meteorite would remain at the museum with tribal members being able to conduct a private ceremony around the meteorite once a year, and that ownership will be transferred to CTGRC should the museum cease to have the meteorite on display.
In response to a student's request in 2007, Representative John Lim introduced a resolution that would demand that the museum return the meteorite to Oregon. The tribes said they were not consulted, they did not support the resolution, and were content with the current arrangement with the museum.
The 28-pound (13 kg) crown section of the meteorite that had been traded to the Macovich Collection for a Martian meteorite in 1997, was planned to be auctioned in October 2007, which led to claims by the CTGRC of insensitivity. Bidders dropped out when an editorial in the Portland Oregonian newspaper asserted the CTGRC would file a lawsuit against the new owner, but the CTGRC disavowed the editorial and said they had no such intent, and that they could not stop the sale. While the newspaper printed an apology, the specimen was withdrawn. A lawsuit was filed against the newspaper in Oregon Circuit Court and failed.
A 4.5-ounce (130 g), 7.5-inch (19 cm) piece of the meteorite, also with a Macovich Collection provenance, was purchased in a 2006 auction and was displayed at the Evergreen Aviation & Space Museum in McMinnville, Oregon until it was returned to the Confederated Tribes of the Grande Ronde on February 22, 2019.
There is some confusion about the mass of the Willamette meteorite because of the difference between metric tons and short tons, often both called simply tons. The result is that sources report different weights, ranging from 15,500 kilograms (34,200 lb) to 12,700 kilograms (28,000 lb). The official American Museum of Natural History web site also reports both "15.5 tons" and "14 tons". Moreover, in 1906 the American Museum of Natural History stated that the weight of the Willamette meteorite was "at least 31,200 pounds, or about 15.6 tons". After these considerations it is reasonable to guess that the real weight of the meteorite is about 14,150 kilograms (31,200 lb).[original research?]
A replica of the meteorite is in Eugene, Oregon, outside the University of Oregon Museum of Natural and Cultural History on the University of Oregon campus. Another replica stands near the Willamette Methodist Church in West Linn, Oregon. The only exact replica in existence is currently installed in the Chachalu Museum at the Confederated Tribes of Grand Ronde (CTGR) in Grand Ronde, Oregon. The aluminum replica was CNC-milled from a 3D model produced through photogrammetry by artist Garrick Imatani, working in conjunction with the CTGR. Imatani also created an interpretation of this meteorite that is on permanent display at the University of Oregon in Straub Hall. 
- Willamette meteorite, West Linn, Clackamas Co., Oregon, USA. Retrieved on October 30, 2008.
- The American Museum Journal, American Museum of Natural History, 1906.
- Meteoritical Bulletin Database: Willamette. The Meteoritical Society. Retrieved on August 16, 2008.
- Alaimo, Michelle (30 June 2016). "Tribal members visit Tomanowos" (PDF). Smoke Signals. The Confederated Tribes of Grand Ronde. Retrieved 8 July 2018.
- "Willamette Meteorite Agreement". American Museum of Natural History. Retrieved 8 July 2018.
- O. Richard Norton. Rocks from Space. USA, Mountain Press, 1994.
- "Cullman Hall of the Universe: The Willamette Meteorite". American Museum of Natural History. Archived from the original on 2007-12-21. Retrieved 2007-11-02.
- Pugh, R. N.; Allen J.E. (1986). "Origin of the Willamette Meteorite". Abstracts and Program for the 49th Annual Meeting of the Meteoritical Society. 600: 208. Bibcode:1986LPICo.600E.208P.
- "The Willamette Meteorite". Houston Chronicle. October 26, 2007.
- Weiser, Benjamin (February 29, 2000). "Museum Sues to Keep Meteorite Sought by Indian Group". The New York Times.
- Science Channel's "Top Ten Meteorites". Retrieved on November 29th, 2010.
- Sullivan, John (June 23, 2000). "Pact Leaves Meteorite With Museum". The New York Times.
- ^ Vagn F. Buchwald: Handbook of Iron Meteorites, University of California Press 1975.
- Scott, E. R. D.; Wasson, J. T.; Buchwald, V. F. (1973). "The chemical classification of iron meteorites—VII. A reinvestigation of irons with Ge concentrations between 25 and 80 ppm". Geochimica et Cosmochimica Acta. 37 (8): 1957–1983. Bibcode:1973GeCoA..37.1957S. doi:10.1016/0016-7037(73)90151-8.
- Oregon Iron Co. v. Hughes, 47 Or 313, 82 P 572 (1905).
- Preston, Douglas. Strange Journey: Further Travels of The Willamette Meteorite. Meteor Treasures. Retrieved on October 31, 2007.
- Geology Tour. Archived 2005-12-14 at the Wayback Machine University of Oregon: Museum of Natural History. Retrieved on October 31, 2007.
- Walsh, Edward (March 26, 2007). "Oregon's Pet Rock". Retrieved 2010-10-23.
- Chang, Kenneth (February 14, 2002). "Uproar Over a Sliced, and Revered, Meteorite". The New York Times.
- "Tribe: Sale of space rock 'insensitive'". CNN. 2007-09-14. Archived from the original on September 14, 2007. Retrieved September 15, 2007.
- "Cow-killing meteorite sells for $1,554". CNN. 2007-10-29. Archived from the original on October 30, 2007. Retrieved October 31, 2007.
- Saturday, October 20, 2007 / Portland Oregonian — Apology/Retraction on the Editorial Page
- Chan, Sewell (September 14, 2007). "Tribe Alarmed by Auction of a Meteorite Fragment". The New York Times. Retrieved November 28, 2010.
- Tims, Dana (Oct 22, 2007). "For sale: 30 pounds of controversy". The Oregonian. Retrieved April 18, 2014.
- Darryl Pitt v. Advance Publications, et al., Oregon Circuit Court, 0810-14798 (2008)
- "Willamette Meteorite to Return to Oregon as Part of Evergreen Aviation Museum's Collection". Salem-News.com. 2006-04-14. Retrieved 2008-06-06.
- Tims, Dana (2008-06-06). "Space history stands tall in museum". The Oregonian. Retrieved 2008-06-06.
- "A Piece Of Sacred Meteorite Is Returned To An Oregon Tribe". Oregon Public Broadcasting. 2019-02-22. Retrieved 2019-04-15.
- Meteoritical Bulletin Database: Willamette
- Harry Y. McSween. Meteorites and Their Parent Planets. Cambridge University Press, 1999.
- Planets Zone, Rose Center for Earth and Space. Archived 2007-12-21 at the Wayback Machine American Museum of Natural History. Retrieved on August 16, 2008.
- Arthur Ross Hall of Meteorites. Archived 2008-07-05 at the Wayback Machine American Museum of Natural History. Retrieved on August 16, 2008.
- AMNH Special Collections: Astronomy slides. American Museum of Natural History. Retrieved on August 16, 2008.
- The Willamette Meteorite, Information Sources and Links. Clackamas County Oregon History and Genealogy. Retrieved on August 16, 2008.
- Bull, Brian. "A Sacred Meteor To Be Celebrated, Blessed, Through New Art Installation". www.klcc.org. Retrieved 2019-03-06.
|Wikimedia Commons has media related to Willamette meteorite.|
- On the agreement between American Museum of Natural History and the Confederated Tribes of the Grand Ronde Community
- Map reference
- Articles search result for "Meteorite" on the Confederated Tribes of the Grand Ronde website
- Geological Society of Oregon on the Missoula Floods & the Willamette Meteorite
- About the Williamette [sic] Meteorite in Oregon