When deep ice sheets chilled most of North America and Europe 20,000 years ago, Alaska and eastern Siberia remained remarkably ice-free, providing passage for America's first humans. But before the explorers arrived, during earlier Pleistocene ice ages, an ice sheet more than half a mile (about 1 kilometer) thick jutted into the Arctic Ocean from Siberia, a new study finds. Seafloor surveys near Wrangel Island (off the coast of Siberia) and the ...
http://www.huffingtonpost.com/2013/10/04/ancient-arctic-ice-sheet-seaf
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