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But the mammoth's extinction is still shrouded in mystery, and scientists continue to debate whether an abruptly warming climate, human hunters or a combination of both drove the animals to extinction.
In a study published in 2016 in the journal Science Advances, researchers suggested that a perfect storm of both factors doomed the ice age giants, but earlier works, such as a 2014 study published in the journal PLOS ONE, placed more of the blame on humans, Live Science previously reported."Such questions are essential to understanding the greater impact of people on their environments," Krasinski and Wygal wrote in the email.
Ocean sediment C-14 data The Lamont-Doherty Earth Observatory of Columbia University has compiled 974 C-14 dates from 309 ocean sediments cores, covering the period from 40,000 years BP to the present worldwide. The USGS Bear Lake Project aims to create records of past climate change for the Bear Lake region,including changes in precipitation patterns during the last 10,000 years and how the size of Bear Lake has varied in the past, to assess the possibility of future flooding and drought.
A prehistoric campfire and a number of archaeological treasures — including a large tusk of a mammoth, and tools fashioned out of stone and ivory — remained hidden for thousands of years in the Alaskan wilderness until researchers discovered them recently.
It fell into a pit-like cave with no escape, and there it died.
Though other sites have ivory fragments, this discovery marks only the second time that researchers have uncovered an entire mammoth tusk from an archaeological site in Alaska, the researchers said.
Blue-gray Arctic foxes native to the 40-square-mile island appear without fear outside home base, a research station run by the National Oceanic and Atmospheric Administration.
At last, a bright morning arrives and the researchers head to Lake Hill, a crater lake encircled by a snow-covered rim. Members thread together meter-long sections of pipe attached to a tube, or corer.
A decade after he found the tooth, Graham returned to St.
Paul with his team of experts, ready to glean clues from new sediment cores about the intertwined history of the island and its mammoths.