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Cenozoic Life - Cenozoic Life Cenozoic EVIDENCE FOR...

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4/22/11 1 Cenozoic Life Cenozoic EVIDENCE FOR CENOZOIC CLIMATE CHANGE… Remember in the Cretaceous, climates were much warmer than today. Although the oceans and atmosphere are affected by the K/T boundary the climate soon returned to its greenhouse state in the Paleocene. Eocene rocks show fossils of palms and cycads at 60°N, alligators lived at 77°N. Beginning of the Eocene was marked by a major warming event. • Why? Change in oceanic circulation. The Late Eocene and Oligocene the earth climate had dropped >10°C. Earth went from hothouse ocean to icebox ocean. Close to home! Calvert Cliffs
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4/22/11 2 35-40myr the earth began to experience a steady temperature decline until a critical threshold has reached and ice caps began to form and grow. Glaciation began on both poles in the middle Cenozoic. Oligocene and Miocene fossils suggests cooling temperatures. IRD was first found in the Cenozoic from Miocene aged sediments. The Arctic ocean has been mainly ice covered for the past 15myr. Plankton O-18 evidence for cooling Benthic foraminifera Nummulitid foraminifera
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4/22/11 3 Leaf evidence for climate
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