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Earth History GEOL 2110

Earth History GEOL 2110. The Paleozoic Era Part 4A: The Silurian and Devonian Periods Time of Fish, Amphibians and Forests. Major Concepts. Biodiversity on the seafloor continued in Silurian and Devonian times. Ammonites replaced Nautiloids ; Bony fish diversified to skeletal fish.

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Earth History GEOL 2110

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  1. Earth History GEOL 2110 The Paleozoic Era Part 4A: The Silurian and Devonian Periods Time of Fish, Amphibians and Forests

  2. Major Concepts • Biodiversity on the seafloor continued in Silurian and Devonian times. Ammonites replaced Nautiloids; Bony fish diversified to skeletal fish. • Land began to be populated with burrowing animals, spiders, scorpians and later amphibians • Spore-bearing vascular plants took root in the form of club moss, ferns, horsetails and seed ferns. • The proliferation of coral reefs caused restricted basins wherein great thickness of limestone and evaporites were deposited.

  3. Silurian – Devonian Major Events

  4. Marine Biodiversity Recovers from Ordovician Extinction Trilobites get big and defensive 1’ Spirifer Brachiopods Thick-walled, “winged” Brachs

  5. Marine Biodiversity Recovers from Ordovician Extinction Coiled Ammonoid Cephalopods Replace Straight Nautiloids

  6. The Age of Fishes Jawed Spiny Acanthodians

  7. Invasion of the LandVascular Plants take Root Lycopsids (Club Moss) Rhynia – leaf-less tubes Sphenopsids (Horsetail) Psilophyton –Rooted , strong bundled stalks

  8. Invasion of the LandLate Devonian – Seeded Plants and Trees Plants colonize the land! Late Devonian Seed Fern Stumps, Catskill Mtns, NY Modern-day spore tree fern as existed in the Late Devonian Fossilized Seeds from a Seed Fern

  9. Invasion of the LandVascular Plants take Root Plants colonize the land!

  10. Invasion of the LandBugs and Slimy Creatures Follow Plants colonize the land! Devonian centipede claw and head Devonian compound insect eye Millipede fossil

  11. Invasion of the LandBugs and Slimy Creatures Follow Plants colonize the land!

  12. Proliferation of Reefs

  13. Huge reefs in the Silurian and Devonian, made of: Silurian-Devonian Coral Reefs Tabulate Chain Coral Sponges Rugose Corals Heliophyllum Hexagoneria

  14. Silurian-Devonian Coral Reefs

  15. Ecological Zonation of Coral Reefs

  16. Reef Facies Devonian Reef Complex, W. Australia

  17. Modern-day Reef Environment

  18. Silurian Reef Thorton Quarry, South of Chicago

  19. Late Devonian ExtinctionAnother Cool Down?

  20. Next Lecture • The Paleozoic Era • Part 4b: Stratigraphyand Tectonics ofSilurian and Devonian Periods

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