Cenozoic History

Cenozoic History - Cenozoic Events Cenozoic period Eocene...

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1 Cenozoic Events Eocene and Modern Cenozoic period Cenozoic • Half of the present sea floor was formed since the end of the Cretaceous! • Atlantic and Indian rifting had increased. East Coast • Erosion is still dominant. • Passive margins. • Carbonate sediments accumulated along Florida. Florida region
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2 Eastern passive margin GOM • Best record of Cenozoic strata in N.A. • 8 transgressions/regressions have been recorded in the sediment layers. • Transgressions as far north as Illinois! Gulf Coast/GOM Tectonics and Erosion in the Rockies • At the end of the Cretaceous was the Laramide orogeny . This continued into the middle Eocene (70-40myr ago). • This orogeny produced intermontane basins. Cordillera Laramide orogeny
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Intermontane basins - Formed large freshwater lakes in the middle Eocene. - Green River Formation - In some places limestone formed. - Amazing fossil preservation. - Oil shales. - Claron Formation Eocene freshwater fossils from intermontane lakes Green River Formation Location of oil shales Oils shales • Organic rich fine
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This note was uploaded on 01/23/2012 for the course GEOL 102 taught by Professor Kysar during the Spring '06 term at George Mason.

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Cenozoic History - Cenozoic Events Cenozoic period Eocene...

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