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Evolution of the Earth 13.7 Billion Years in the Making

Evolution of the Earth 13.7 Billion Years in the Making. PART 12: Cretaceous Dr. Gregg Wilkerson Earth Science Bakersfield City College. The Mesozoic Era. Triassic Jurassic Cretaceous. Cretaceous: 145 to 65 M.Y. Ago: End of the Dinosaurs.

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Evolution of the Earth 13.7 Billion Years in the Making

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  1. Evolution of the Earth13.7 Billion Years in the Making PART 12: Cretaceous Dr. Gregg Wilkerson Earth Science Bakersfield City College

  2. The Mesozoic Era • Triassic • Jurassic • Cretaceous

  3. Cretaceous: 145 to 65 M.Y. Ago: End of the Dinosaurs

  4. Cretaceous – Tertiary Impact: World Map: 65 Million Years Ago

  5. Sevier Orogeny: 140 and 50 M.Y. Ago • Rocky Mountains • Cretaceous to Eocene • Third Cordilleran Orogeny • Late Jurassic, Cretaceous, Paleocene and Eocene • Subduction of Farallon Plate under N. America at low angle • Western Utah and Eastern Nevada fold and thrust belts • Contemporaneous with the Laramide Orogeny • Video

  6. Sevier and LaramideOrogenies Sevier Laramide Slightly Older Collision of Farallon Plate and cementation to N. Am. plate More like Collison Thick skin, high angle faults 80 to 35 million years More eastern Basement core uplift • Slightly younger • Collision of Farallon and Kulua Plates • More like Subduction • Thin skin, low angle faults • 140 to 50 million years • More western compressional even

  7. Sevier Orogeny: Mesozoic to Cenozoic

  8. Laramide Orogeny • Nevada, California, Utah, Arizona • 4th Cordilleran Orogeny • Overlap with Sevier Orogeny • Video

  9. Life in the Cretaceous ocean: 145 to 65 M.Y. ago

  10. Cretaceous Life on Land • Tyrannosaurus • Triceratops • Ankylosaurus • Mammals • Pterodactyls

  11. Cretaceous Mass Extinction • Deccan Plateau Flood Basalts of India • Global Warming, Forest Fires • Meteorite Impact, global cooling • Disease?

  12. Iridium Layer marks the event Iridium rare in earth rocks, common in meteorites

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