Card Set Information

2014-04-10 18:59:34
bio geo

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  1. taxonomy
    • what happens between death and discovery
    • - biostratonomy
    • - diagenesis
  2. biostratinomy
    sedimentary processes interact with remaining parts; surficial processes: scavenging, breakage, transport, etc; after death and before fossilization
  3. diagenesis
    chemical alteration and lithification (process in which sediments compact under pressure); post burial processes: deformation, compaction, erosion, etc; after fossilization and before collection
  4. preservational biases/prerequesites
    hard parts and rapid burial/seclusion from environment
  5. Organisms with __ dominate the fossil record, while organisms with __ have a poor chance of being fossilized.
    mineralized skeletons/hard parts; soft parts
  6. Rapid burial/seclusion from environment is crucial to fossilization because
    they are subjected to fewer destructive taphonomic processes, such as physical damage, scavenging, and microbial decay
  7. modes of preservation
    • Relatively unaltered soft body tissues are very rare.
    • Relatively altered soft body tisssues are rare.
    • Relatively unaltered hard parts are more common.
    • Relatively altered hard parts are the most common.
  8. Unaltered soft tissue can occur due to
    freezing, amber (insects), mummification, and sealing off the organisms from the microbial world by taking away water
  9. Altered soft body parts requires (at least one of the following):
    obtrusion (rapid burial), stagnation (anoxia: no oxygen), and rapid mineralization (carbonization, pyritization)
  10. La brea tar pits, shark teeth, and oyster beds are examples of
    unaltered hard parts
  11. Altered hard parts occur due to
    recrystalization, replacement, permineralization
  12. body fossils
    represents piece of the actual organism, either the remains or the molted skeleton
  13. trace fossils
    evidence of animal behavior but do not represent the animals death. ex. burrows
  14. Lagerstatten
    • fossil bonanza: concentration deposits
    • 1. high diversity with decent preservation (not articulated). e.g. bone beds, dinosaur national monument, la brea tar pits
    • 2. exquisite preservation. e.g. burgess shale, holzmaden shale