Lecture 25-new

Lecture 25-new - TheOnceandFuture GlacialWorld...

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The Once and Future ‘Glacial World’ The world of the Wisconsin (Eemian) Glacial Period 12,000 - 71,000 years before present
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The Quaternary Glacial World About 2.5 million years ago, the increasingly colder conditions of the Cenozoic Era led to the beginning of a period, the Quaternary, with true ‘glacial ages’ separated by intervals of much warmer conditions. In the beginning, the glacial/interglacial cycles lasted about 40,000 years. But, about 1 million years ago the cycles changed to about 100,000 years. We stil l do not know exactly why this happened.
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Quaternary Glacial/Interglacial Oscillations Cause of Glacial/Interglacial Oscillations - Milankovich Cyclicity
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Milankovich Cyclicity and Glaciations Amount of insolation controls the rate of ice buildup or melting. There will be a time lag, however, because it takes 1000s of years for glaciers to grow or melt.
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interglacial glacial Proxy evidence for glacial conditions
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last glacial have been recovered
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This note was uploaded on 05/08/2009 for the course GEOL 150Lxg taught by Professor Stott during the Spring '07 term at USC.

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Lecture 25-new - TheOnceandFuture GlacialWorld...

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