Chap. 10

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abreaux
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80317
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Chap. 10
Updated:
2011-04-18 04:05:58
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geo
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geo
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  1. Phanerozoin Eon means:
    "visible life"
  2. Phanerozoic Eon occured:
    542 million years ago to the present
  3. Phanerozoin Eon consists of 3 eras:
    • - Paleozoic "ancient life
    • - Mesozoin "middle life"
    • - Cenozoic "recent life"
  4. The Paleozoic Era can be divided into 2 parts:
    Early Paleozoic and Late Paleozoic
  5. Cambrian, Ordovician, and Silurian
    Early Paleozoic
  6. Devonian, Mississippian, Pennsylvanian, and Permian
    Late Paleozoic
  7. Vascular plants on land first appeared in...
    late Silurian; erosion was active/severe without plant roots to hold soil
  8. The first-occurance of shell-bearing organisms:
    the base of the Cambrian; trilobites, brachiopods, molluscs
  9. The oldest occurance of feeding burrows of the trace fossil Phycodes pedum
    the base of the Cambrian
  10. The Paleozoic is characterized by long periods of sedimentations punctuated by mountain building
  11. Paleoclimatic evidence comes from environmentally-sensitive sedimentary rocks
    glacial depisots, coal swamp deposits, reef carbonates, evaporites
  12. The early Paleozoic climate was affected by:
    • - Earth spun faster & had shorter days
    • - tidal effects stronger because Moon was closer to Earth
    • - vascular plants were absent on land
  13. Major Orogenic Belts:
    • - Appalacian Mtns
    • - Ouachita Mtns
    • - Cordillera Mtns
  14. Paleozoic rocks of the platform are:
    relatively flat-lying to gently dipping (warped into basins, doms, arches, synclines)
  15. Paleozoic rocks in Ouachita-Appalachian orogenic belt are:
    severely deformed (folded, faulted, etc)
  16. mountain-building events
    orogenies
  17. In Appalachian region, there were 3 Paleozoic orogenies:
    • - Taconic orogeny (Ordovician)
    • - Acadian orogeny (Silurian-Devonian)
    • - Alleghanian orogeny (Pennsylvanian)
  18. When did the supercontinent Rodinia rifted apart to form several large continents?
    just before the Paleozoic
  19. When continents are located on a pole, glaciers will form
    shallow epicontinental seas are unlikely during glaciations
  20. By Cambrian period, continents moved off the pole
    some continents lie on the equator
  21. By Cambrian Period, glaciers melted and sea levels rose
    shallow epicontinental seas flooded the continents
  22. Laurentian
    North American
  23. During the Early Paleozoic, shallow epicontinental seas transgressed across Laurentian (N. American) craton
    this happened as the glaciers melted and sea level rose
  24. seas regressed as the glaciers enlarged and sea level dropped
  25. Epicontinental Seas (during transgression)
    sands, muds, and carbonates were deposited in the shallow seas
  26. Cambrian Paleogeography of N. America
    Laurentia is covered in shallow seas; lies on equator so water is warm; water deeps towards edges of continent where shale is deposited
  27. planktonic (floating) colonial animals; fossils occur as black marking in dark shale
    Graptolites
  28. Taconic Orogenic Belt
    lies between Laurentia (N. America) and Baltica (Europe) in Ordovician; partial closer of lapetus Ocean
  29. As Taconic mountain belt eroded,
    huge delta systems spread westward
  30. During Ordovician, Gondwana moved towards S. Pole
    leading to glaciation in Africa at end of Ordovician
  31. End of Ordovician:
    sea levels dropped sharply; glaciation
  32. In the Middle ____, shallow seas covered more of the continents than at any other time
    Silurian
  33. The epicontinental seas withdrew toward end of the:
    Silurian

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