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10. fossil notes
10. fossil notes
10. fossil notes
10. fossil notes
10. fossil notes
10. fossil notes
10. fossil notes
10. fossil notes
10. fossil notes
10. fossil notes
10. fossil notes
10. fossil notes
10. fossil notes
10. fossil notes
10. fossil notes
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10. fossil notes

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Transcript

  • 1. Fossils
  • 2. Fossils:  The trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock, can be used to identify the relative or absolute age of a rock
  • 3. Paleontology  The study of fossils and ancient organisms
  • 4. Mummification  Typically occurs in dry places where bacteria can’t survive
  • 5. Amber:  Organisms trapped in ancient tree sap
  • 6. Tar Seeps:  Thick petroleum that comes to the surface and is covered by water
  • 7. Freezing:  Low temperatures protect an organism from bacteria
  • 8. Petrification:  Minerals in water seep in and replace original organic materials
  • 9. Imprints:  Carbonized imprints left behind after the organic material decays
  • 10. Molds and Casts  Molds are empty impressions filled by rock while casts are replica of their original organism
  • 11. Gastroliths:  Smooth stones in the digestive system of dinosaurs to help grind up and digest food
  • 12. Trace Fossil:  A fossilized mark that formed in sedimentary rock by the movement of an animal on or within a soft sediment (i.e. a footprint)
  • 13. Index Fossils:  A fossil that is used to establish an age of a rock because it is distinct, abundant, and widespread, and only existed for a short span of geological time, can be used to determine the absolute age of a rock layer
  • 14. Evidence of Plate Tectonics  Fossils of marine life on mountain tops and shallow water organisms in deep water prove crustal movement
  • 15. Key Beds:  Rock layers that contain distinctive characteristics (such as volcanic ash) or fossil content that allow one to correlate rock layers in different areas

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