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Mesozoic Geology

Mesozoic Geology. Part 1 Tectonics. Mesozoic. Age of Reptiles Pangea breakup. Early stages of rifting. Rifting forms small ocean. Rifting develops full ocean. How to recognize a rift? How to date a rift?. Pangaea at end of Permian. Late Triassic rifting. Atlantic ocean opens

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Mesozoic Geology

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  1. Mesozoic Geology Part 1 Tectonics

  2. Mesozoic • Age of Reptiles • Pangea breakup

  3. Early stages of rifting

  4. Rifting forms small ocean

  5. Rifting develops full ocean

  6. How to recognize a rift? • How to date a rift?

  7. Pangaea at end of Permian

  8. Late Triassic rifting • Atlantic ocean opens • 1st: N. America/Africa • 2nd: S. and N. America

  9. Late Triassic rifting • Atlantic ocean opens • 1st: N. America/Africa • 2nd: S. and N. America

  10. New ocean basin • Water fills new ocean basins • Still restricted currents in tropics • High temps., high evaporation • What forms?

  11. Jurassic rifting • Gondwana starts • Australia/Antarctica break from S. America/Africa

  12. Jurassic rifting • India • South America and Africa • Europe and Africa converge

  13. Cretaceous rifting • Australia and Antarctica • India near equator • S. America and Africa well apart

  14. What is left: • Greenland from Europe and N. America in Cenozoic

  15. Effects of Pangaea breakup • Young, hot ocean crust • Sea levels pushed up by crust • Cretaceous: sea level highest since Ordovician • 1/3 of current exposed land was underwater

  16. Effects of Pangaea breakup • Climate changes • Pangaea’s climate? • Triassic evaporites/red beds/desert dunes

  17. Effects of Pangaea breakup • Jurassic & Cretaceous: less deserts on all continents

  18. Permian North America geography • N. America near equator • Absaroka sea retreats

  19. North America in Triassic

  20. North America in Jurassic

  21. North America in Cretaceous • Cretaceous Seaway • Arctic to Gulf of Mexico

  22. East Coast Geology limestone Cretaceous Marine shale Marine sandstone Marine sandstone Jurassic Marine shale Marine sandstone Continental sandstone/conglomerates Basalt flows Triassic continental sandstone/conglomerates with lots of faults Continental sandstone/conglomerates

  23. Triassic on East coast • Rift-related lava on east coast • Nova Scotia to N. Carolina

  24. Gulf Coast Geology limestone Cretaceous shale sandstone Jurassic Salt, gypsum Conglomerates, nonmarine muds Triassic

  25. New ocean basin • Evaporites • Triassic/Jurassic in Gulf of Mexico • Jurassic in southern Atlantic

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