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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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3 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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