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Coastal environments during the Last Glacial Maximum were complex.

Coastal areas deglaciated rapidly as coastal alpine glaciers, then lobes of Cordilleran ice, retreated.The pre-LGM warm cycles in Arctic Siberia saw flourishes of megafaunas.The oxygen isotope record from the Greenland Ice Cap suggests that these cycles after about 45k years BP lasted anywhere from hundreds to between one and two thousand years, with greater duration of cold periods starting around 32k cal years BP.Stones described as probable tools, hammerstones and anvils, have been found in southern California, at the Cerutti Mastodon site, that are associated with a mastodon skeleton which appeared to have been processed by humans.The mastodon skeleton was dated by thorium-230/uranium radiometric analysis, using diffusion–adsorption–decay dating models, to 130.7 ± 9.4 thousand years ago. Waters commented that "To demonstrate such early occupation of the Americas requires the presence of unequivocal stone artefacts.

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Models of molecular evolution rates are used to estimate the ages at which Native American DNA lineages branched off from their parent lineages in Asia and to deduce the ages of demographic events.

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