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Cenozoic Mammals and the Modern World
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Cenozoic 65-0 Myr
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Highlights of the Cenozoic: Geology 1.Continents move into their current configurations. (Western NA remains active.) 2.Tethys Sea closes with the Alpine/Himalayan Orogeny. 3.Minor sea level fluctuations 4.Temperature peaks in the Eocene and drops through the Pliocene/Pleistocene Ice Age.
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Highlights of the Cenozoic: Life 1.Mammals and angiosperms (including grasses) diversify and dominate. 2.Mammals return to the sea. 3.Two minor mass extinctions - Eocene and Pleistocene/Holocene. 4.Humans appear in the Pliocene and by the late Holocene become a “geologic force”.
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Cenozoic Geology
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Late Cretaceous
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Early Eocene
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Late Eocene
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Early Miocene
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Late Miocene
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Separation of Antarctica & Climate
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Alpine/Himalayan Orogeny & the Closing of the Tethys Sea
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The Rise and Fall of the Western US Subduction to San Andreas Laramide Orogeny to Basin and Range
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Subduction of the Farallon Plate: Origin of the San Andreas Fault and the Gulf of California
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Subduction of a Spreading Ridge
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The Laramide Orogeny (Rocky Mountains)
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The Basin and Range
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Curiosities: The Grand Canyon <5 Myr Old!
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Curiosities: Yellowstone
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Curiosities: The Olympics
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Curiosities: Chesapeake Bay Late Eocene
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Curiosities: Central America
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Central American Land Bridge
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Climate - Hot to Cold
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Sea Level Fluctuations TransgressionRegression
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The Pliocene/Pleistocene Ice Age
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The Final Ice Age
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What Causes Ice Ages? 1.Position of the Continents Changes to Ocean Currents Closer o Poles 2.Orogenies / Uplift of Land Surface Changes in air circulation Increased erosion 3.Changes in Greenhouse Gases
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Glacial Cycles within an Ice Age
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What Causes Cycles?
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Some Effects of the Ice
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Changing Ecosystems
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