L+5-The+Ice+Age

L+5-The+Ice+Age - Lecture 5: The Ice Age Geologic Time &...

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Lecture 5: The Ice Age Lecture 5: The Ice Age
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Over the past 70 million years there has been a general decrease in atmospheric temperature. The Pleistocene (Ice Age) began about 2 m. y. a. Based mainly on O 18 /O 16 ratios in foraminifera Price & Feinman, p. 82
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Pleistocene Glacial Chronology Pleistocene Glacial Chronology 9 major oscillations Glacial (cold) followed by Interglacial (warmer) periods Seasonality was less pronounced, with cooler summers Causes are unclear Volcanism Solar radiation Mountain uplift Variation in earth’s orbit Milankovitch forcing A drop in atmospheric temperature of 8 degrees F would certainly bring on a Ice Age Price & Feinman, p. 83
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Continental Glaciers and Shelves Continental Glaciers and Shelves 30% of the earth’s surface was covered by glaciers Up to 3 miles thick Reduced the earth’s liquid reservoir of water Sea levels lowered by 500 ft Price & Feinman, p. 84
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Barriers and Corridors Barriers and Corridors
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This note was uploaded on 04/08/2008 for the course ARCH UNKNOWN taught by Professor Seeman during the Spring '08 term at Kent State.

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L+5-The+Ice+Age - Lecture 5: The Ice Age Geologic Time &...

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