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Ordovician

EARLY PALEOZOIC LIFE. Ordovician. EARLY PALEOZOIC LIFE. Silurian. EARLY PALEOZOIC LIFE. Plants in the Paleozoic. Stromatolites Blue-green algae Abundant in Cambrian. EARLY PALEOZOIC LIFE. Plants in the Paleozoic. Green algae Receptaculids Chlorophytes Silurian to Devonian.

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Ordovician

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  1. EARLY PALEOZOIC LIFE Ordovician

  2. EARLY PALEOZOIC LIFE Silurian

  3. EARLY PALEOZOIC LIFE Plants in the Paleozoic Stromatolites Blue-green algae Abundant in Cambrian

  4. EARLY PALEOZOIC LIFE Plants in the Paleozoic Green algae Receptaculids Chlorophytes Silurian to Devonian Unknown affinity “Sunflower coral” Not sunflower or coral

  5. EARLY PALEOZOIC LIFE Plants in the Paleozoic Land Plants Cooksonia Silurian

  6. EARLY PALEOZOIC LIFE Mass Extinctions

  7. EARLY PALEOZOIC LIFE Mass Extinctions • Extinction Processes • Extinction strikes on the land and in the sea. • On the land, while animals suffer repeatedly, • plants tend to be highly resistant to mass extinctions. • Preferential disappearance of tropical forms of life • during mass extinctions. • Tendency of certain groups of animals to experience • them repeatedly (for example, trilobites and • ammonoids). • Alleged equal spacing, or periodicity in geological time • (occurring about every 26 million years).

  8. EARLY PALEOZOIC LIFE Mass Extinctions

  9. EARLY PALEOZOIC LIFE Mass Extinctions

  10. EARLY PALEOZOIC LIFE Mass Extinctions Ordovician Mass Extinction Second most devastating in earth history Caused by glaciation and associated lowering of sea level

  11. EARLY PALEOZOIC LIFE Mass Extinctions Devonian Mass Extinction Caused by glaciation or meteorite impact

  12. EARLY PALEOZOIC LIFE Mass Extinctions Permian Mass Extinction 90-95% of marine species became extinct in the Permian Caused by formation of Pangea, glaciation, volcanic eruptions

  13. EARLY PALEOZOIC LIFE Mass Extinctions Triassic Mass Extinction 25% of all families became extinct at end of Triassic Caused by climate change (increase in rainfall)?

  14. EARLY PALEOZOIC LIFE Mass Extinctions Cretaceous-Tertiary (K-T) Mass Extinction 85% of all species died in the K-T extinction Caused by meteorite impact and/or volcanic eruptions

  15. THE DEVONIAN The Age of Fishes Named for outcrops near Devonshire, England Named by Sedgewick and Murchison in 1839 prior to bitter arguments Includes the Old Red Sandstone of Scotland and Wales

  16. THE DEVONIAN The Age of Fishes

  17. THE DEVONIAN

  18. THE DEVONIAN Kaskaskia Sequence Began in Devonian and continued to the end of the Mississippian Craton again flooded

  19. THE DEVONIAN Kaskaskia Sequence Began with deposition of clean quartz sand Initial deposit of transgressing sea Oriskany Sandstone

  20. THE DEVONIAN Kaskaskia Sequence Oriskany Sandstone Some heavy minerals Indicate source area Sandstone followed by Limestones Salts and gypsum Shales

  21. THE DEVONIAN Acadian Orogeny

  22. THE DEVONIAN Devonian Paleogeography

  23. THE DEVONIAN Devonian Paleogeography

  24. THE DEVONIAN Impact of Avalonian Terrane Thick folded sequence of turbidites Intruded with rhyolites and granites Destroyed the marine depositional basin off eastern US coast

  25. THE DEVONIAN Impact of Avalonian Terrane Nonmarine clastics shed to west

  26. THE DEVONIAN Impact of Avalonian Terrane Changes from conglomerate to shale going east to west

  27. THE DEVONIAN Impact of Avalonian Terrane Catskill Clastic Wedge

  28. THE DEVONIAN Impact of Avalonian Terrane Catskill Clastic Wedge

  29. THE DEVONIAN Impact of Avalonian Terrane Catskill Clastic Wedge Nonmarine rocks – red color Braided or meandering streams

  30. THE DEVONIAN Impact of Avalonian Terrane Catskill Clastic Wedge

  31. THE DEVONIAN Impact of Avalonian Terrane Catskill Clastic Wedge First forests Gilboa, NY

  32. THE DEVONIAN Impact of Avalonian Terrane Gilboa, NY Fossils Winifred Goldring NY State Paleontologist First woman to hold title Aneurophyton (foliage) Eospermatopteris (tree)

  33. THE DEVONIAN Impact of Avalonian Terrane Gilboa, NY Reconstruction of Forest

  34. THE DEVONIAN Europe Old Red Sandstone Equivalent to Catskill Clastic Wedge

  35. THE DEVONIAN Acadian shales Chattanooga Shale Few fossils, stagnant anoxic water High organic content, black, phytoplankton bloom

  36. THE DEVONIAN Western US Williston Basin Reefs developed Salt and gypsum Extensive oil reserves

  37. THE DEVONIAN Western US Antler Orogeny Late Devonian to Pennsylvanian Began with subduction on west coast

  38. THE DEVONIAN Western US Antler Orogeny Late Devonian to Pennsylvanian Convergence of volcanic island arc

  39. THE DEVONIAN Western US Antler Orogeny Convergence of volcanic island arc

  40. THE DEVONIAN Devonian Paleogeography

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