The Bering land bridge slips under the sea again

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CONTENTS of 1,000,000 BC- 8,001 BC: The peopling of the prehistoric Americas and the extinctions of the American megafauna

This page last updated on or about 10-13-05
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Approximately 8,500 BC - 7,500 BC: The Bering land bridge slips under the sea again, separating the Americas from Asia

Sea voyages once again become the only way to reach the Americas from the rest of the world (unless travelers can survive a crossing of the icy wastes of the Arctic).

The Bering land bridge may have been dry as recently as 9,000 BC, but its vegetation was inadequate to support grazing animals of substantial size.

-- Beringia Land Bridge Lasted Until 11,000 Years Ago, 11/26/96, Anthropology News Briefs ["http://realindy.com/anthronews.htm"]

In the northern hemisphere at least (and likely true of the rest of the world as well), substantial climate change for vast regions can take place within ten years or less-- well within a single human life time. The so-called Little Ice Age was documented to end in a mere ten years during the 1840s.

-- Evidence of catastrophic volcanic events locked in Wyoming glacier ["http://www.eurekalert.org/releases/usgs-eoc022800.html"]; EurekAlert! 27 FEBRUARY 2000 Contact: Heidi Koehler hkoehler@usgs.gov 303-202-4743 United States Geological Survey

Climate changes can happen with little or no warning. Around 8000 BC in Michigan there was around a 145 year window of opportunity for a certain small forest to spring up in the wake of shrinking Ice Age glaciers. A sudden climate change opened the window, while further escalations in that climate change later closed it, when the glaciers rapidly collapsed and flooded the area with silt carrying water, burying and drowning the forest where it stood. The flood was gentle enough not to topple or strip the trees.

From studies of the tree growth rings, it appears that there was no indication beforehand that the climate was going to warm up when it did, in either instance.

-- A Forest From the Past ["http://abcnews.go.com/sections/science/DyeHard/dyehard.html"] By Lee Dye, http://www.abcnews.go.com/, February 24, 2000

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