ESCI exam 2 randoms

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Author:
jennnn
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78228
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ESCI exam 2 randoms
Updated:
2011-04-08 00:02:33
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esci unh earth hist
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unh, earth history exam 2
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  1. Alleghanian orogeny
    Pennsylvanian- Modern day US and Africa (Gondwonaland) collide to form Pangaea
  2. Acadian orogeny
    Silurian/Devonian - collision of Baltica and Avalonia
  3. Taconic orogeny
    • Ordovician - Island arc collides with Laurentia (Modern N. Am) on the eastern margin
    • forms the Appalachian mountains
  4. Cambrian macrofauna
    • poorly calcified marine invertebrates (Trilobites)
    • inarticulated brachiopods, primitive crinoids
  5. Paleozoic macrofauna
    well calcified invertebrates, articulated brachiopods, crinoids, rugose+tabulate corals - development of reef communities
  6. Modern macrofauna
    • taxa that survive the Permo-Triassic extinction
    • eg. gastropods, bivalves
  7. Permo-Triassic extinction
    90 to 95 of all species extinct - trilobites, tabulate corals and rugose corals die out, death of reef life
  8. Causes of Permo-Triassic extinction
    • weak evidence for meteorite theory - A huge volcanic episodes released gases - Siberian Traps-evidence of changes in carbon and sulfur cycle
    • or - gases trapped in massive glaciers, released by melting - evidence...death of passive breathers
  9. Best dating method for materials under 60,000
    • Carbon 14 dating
    • uranium lead dating for oldest materials,
    • potassium argon
  10. Importance of the Burgess Shale
    Cambrian explosion-Shows great diversity in body types, unique phyla...basis for Gould's model of diversification and decimation - First appearance of hard bodies, important for fossil record
  11. Anagenesis vs. cladogenesis
    • Anagenesis is variation with in a species
    • Cladogenesis is a division of the species (speciation)

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