This archaeological site and the residential structure there dating to the Pleistocene contains child cremation remains. : A Terminal Pleistocene Child Cremation and Residential Structure from Eastern Beringia.
Radioactive isotopes are unstable and undergo spontaneous nuclear reactions, emitting particles and/or wavelike radiation.
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— The discovery at Upward Sun River is considered to be the first and earliest evidence of human remains in the Arctic and Sub-Arctic of North America.