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To investigate the mystery of Kennewick Man further and determine whether the skeleton belonged to the Umatilla Native American tribe, who occupied the territory where it was found, scientists analyzed a sample of DNA, but reported that "available technology and protocols do not allow the analysis of ancient DNA from these remains." Forensic anthropologist Douglas Owsley, who later led the scientific team that examined Kennewick Man's skeleton in 2005, discovered that the bones in Kennewick Man's arms were bent.Owsley theorized that this was the result of powerful muscles built up over the course of a lifetime of hunting and spearfishing.Please help by moving some material from it into the body of the article.Please read the layout guide and lead section guidelines to ensure the section will still be inclusive of all essential details.In June 2015, it was made public that scientists at the University of Copenhagen in Denmark determined through DNA from 8,500‑year-old bones that Kennewick Man is, in fact, related to modern Native Americans, including the Confederated Tribes of the Colville Reservation from the region in which his bones were found.In September 2016, the US House and Senate passed legislation to return the ancient bones to a coalition of Columbia Basin tribes for reburial according to their traditions.In July 2005, a team of scientists from around the United States convened in Seattle to study the remains in detail.

Chatters said that the "presence of Caucasoid traits [and a] lack of definitive Native-American characteristics", as well as the apparent context of the skeleton as part of an early Paleo-American group led him to conclude that the body was "Caucasian", A small bone fragment was submitted to the University of California, Riverside, for radiocarbon dating, which dated the skeleton as 9,300 to 9,600 years old (8,400 uncalibrated "radiocarbon years"), and not from the 19th century, as had originally been thought. Chatters put the bone through a CT scan, and it was discovered that the projectile was made from a siliceous gray stone that was found to have igneous (intrusive or volcanic) origins.

However, when size was excluded as a factor, no association to any population was established. Loring Brace classified Ainu and Polynesians as a single craniofacial Jomon-Pacific cluster, and Chatters said "Polynesians have craniofacial similarities to Asian, Australian and European peoples".

Anthropologist Joseph Powell of the University of New Mexico was also allowed to examine the remains.

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but it was not until 2013 that Ancient DNA analysis techniques had improved enough to shed light on the remains.

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