ice age earthice ages arrive in cycles every 100,000 years or so, with brief 20,000 year...
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Ice Age Earth
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Ice Age Earth• Between 2 million and 12,000 years ago, much of the
northern hemisphere was covered in ice.
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Ice Ages arrive in cycles every 100,000 years or so, with brief 20,000 year “Interglacial” periods of relative warmth.
The last Ice Age ended about 10,000 ya
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Ice Age North America 15,000 years ago
• The continent saw two large ice sheets dipping from the arctic to the northern part of the U.S.
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Seattle during Ice Age
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Ice Age Sea Levels Were 300 feet Lower!• Because so much water was locked up in continental
ice sheets, the ocean level was much lower.
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Ice Age Coastline of North America
• The coastline of Washington was 30 miles further west
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The Mississippi Valley and Delta is primarily built from ice age sediments
Deepwater delta deposits
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Bering Land Bridge Connected North America and Asia
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The Bering Land Bridge allowed movement of species between continents
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Beringia Was an Ice Free Grassland During the Ice Age
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Migration of Animals (both ways)
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Great Biotic ExchangeFrom Asia to North America
• Moose, Elk, Deer, Caribou, Musk Ox, Bison, and Bighorn sheep
• Gray wolves
• Grizzly bears and polar bears
• Jaguars, bobcats, lynx
• Skunk, otters, tapirs, weasels, and wolverines
• Beavers, marmots, and snowshoe hares
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America provided Lions, Cheetahs, Horses, and Camels to Asia
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Extinct Ice Age Species• Woolly Mammoth
• Columbia Mammoth
• Mastodons
• Woolley Rhinoceros
• Ground sloths
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Extinct Ice Age Species
• Short-faced Bear
• American lion
• American cheetah
• Sable-toothed cat
• Dire wolf
• American hyena
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Extinct Ice Age Species
• American horses
• American camels
• Giant beavers
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A Mammoth Tusk and Sloth Bones in
Seattle
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