g20 - Ice Ages Pleistocene 3 M.y. Permian 250-220 M.y....

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Ice Ages Pleistocene 3 M.y. Permian 250-220 M.y. Ordovician 450 M.y. Precambrian 900-650 M.y. (Snowball Earth) 2300 M.y .
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Time (1000 Years) North America Alps Northern Europe Poland-Russia 0-18 Interglacial 18-67 Wisconsin Wurm Vistula Varsovian 67-128 Sangamon Uznach Eem Masovian 128-180 Illinoisan Riss Warthe/Saale Cracovian 180-230 Yarmouth Hoetting Holstein Sandomirian 230-300 Kansan Mindel Elster Jaroslavian 300-330 Aftonian Cromer Likhvin 330-470 "Nebraskan " Gunz Menapian 470-540 Waalian 540-550 Donau II Weybourne 550-585 Tiglian 585-600 Donau I 600-2000 About 20 Glacial Advances 2000 (2 M.Y.) Beginning of Pleistocene 4000 (4 M.Y.) Dwarf forests still in Antarctica
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The Last 800,000 years
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Beginning of the Ice Ages
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Milankovich Cycles Cool Summers More Important Than Cold Winters Tilt of Axis Shape of Orbit Precession Can’t be the whole story-have operated throughout earth history
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Axis Tilt Small Axis Tilt: Mild winters but cool summers. Favors Ice Age Large Axis Tilt: Cold winters but hot summers. Favors Interglacial
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This note was uploaded on 02/12/2011 for the course GEO 2200 taught by Professor Wolf during the Spring '08 term at University of Florida.

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g20 - Ice Ages Pleistocene 3 M.y. Permian 250-220 M.y....

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