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Earth History GEOL 2110 PowerPoint Presentation
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Earth History GEOL 2110

Earth History GEOL 2110

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Earth History GEOL 2110

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  1. Earth History GEOL 2110 The Paleozoic Era Carboniferous and the Permian Periods in North America

  2. Major Concepts • Carbonate deposition dominant in the Silurian and Devonian, persisted into the early Carboniferous (the Mississippian period). • After a major regression and subsequent transgression marking the Mississippian-Pennsylvanian break in North America, the Absaroka sequence was dominated by clastic sediments and great accumulations of land-based organic material creating coal seams. • This change in sedimentation, which persisted into the Permian, was triggered by creation of the final orogenic event of the Appalachian mobile belt caused by the collision of southeastern North America with Africa and South America and the creation of the large continental land mass ever on Earth - Pangea

  3. Events of the Late Paleozoic Era

  4. Mississippian DepositsMore Limestone Chockful O’ Crinoids Madison LS, MT Redwall LS, AZ Pahasapa LS, SD

  5. Late Mississippian Regression Immature clastic sediment appear in Eastern NA deposits Sourced from deeper erosion of rejuvenated Caledonian and Acadian Mts More Unconformities developed on warped craton highs

  6. Pennsylvanian DepositsClastic Sedimentation Dominates (+Coal)

  7. Pennsylvanian DepositsCyclothems – Trangressive Cycles Limestone Coal Organic Shale TRANSGRESSION Shale Sandstone Illinois Basin Cyclothem

  8. Pennsylvanian DepositsCyclothems – Trangressive Cycles

  9. Pennsylvanian DepositsOver 100 Cycles in 100 million years! • Cause of Cycles • Rapid sea level changes due to Gondwanaland glaciation • Spasmodic tectonic up-down oscillations • Cyclic climate change affecting erosion and sedimentation

  10. Pennsylvanian Coal DepositsSubtropical Rain Forests Peat Anthracite Everglades Bituminous Coal AnthraciteCoal

  11. Permian Deposits Craton Tilts West / Seas Retreat / Climate Dries

  12. Barrier Reefs in the Southwest

  13. Ancestral Rocky MountainPennsylvanian-Permian Uplift

  14. Late Paleozoic Strata of the Grand Canyon Kls Tf Css HSh Sgp

  15. Late Paleozoic Strata of the Sedona Area

  16. Permian Climate Dries In the Rain Shadow of the Appalachians

  17. The Appalachian OrogenyCreating Pangea ~250 Ma

  18. Continent-Continent CollisionMonster Thrust Faulting 1950’s Interpretation 1980 ~260 Km Displacement

  19. Summary of Paleozoic Tectonics Acadian/Caledonian Appalachian/Hercynian Gondwanaland Taconian North American Paleozoic Orogenies

  20. Next Lecture • The Paleozoic Era • Geological History of Gondwanaland and Late Paleozoic Life • Mid-term on Friday!! • Chapters 8-13