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Multiproxy evidence indicates that warmer-than-present summers became established in Eastern Beringia as early as 14,000–13,000 years ago, but the dispersal of spruces, pines, cedars and hemlocks across the Pacific Northwest (PNW) region of southern Alaska did not begin until at least 1500 years afterwards, and took many thousands of years to be completed. There are many potential reasons for this...
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