Fossils
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Fossils Presentation Transcript

  • 1. Fossils
    • Preserved remains of living things
    • Provide scientists (paleontologists) with evidence of how life on Earth has changed over time
  • 2. Fossil Formation http://www.youtube.com/watch?v=G4jM2t3NHPA&feature=related
  • 3. Fossil Formation
    • Organism dies and is quickly buried by sediment (this protects the organism)
    • Minerals replace all or part of organisms original structure
      • More delicate parts often decay before this can happen
    • Sediment hardens and turns into rock
  • 4. Mold and Cast Fossils
    • Most common
    • Mold
      • hollow area in shape of organism
    • Cast
      • copy of the organism
    • Mold & Cast are opposites
  • 5. Mold and Cast Fossils
    • Provides evidence of:
    • Organism’s physical characteristics (size, shape, etc)
      • Limited to the structures that are able to be preserved
    • May also provide clues to environment in which organism lived
  • 6. Petrified Fossils
    • Minerals replace all or part of an organism
      • Occurs when water rich in minerals is absorbed into organisms cells
      • Petrified means turned into stone
  • 7. Petrified Fossils
    • Provides evidence of:
      • Size of organism
      • Age of organism (esp. if a tree)
      • Past environments
  • 8. Carbon Film
    • Extremely thin layer of carbon on a rock in the shape of the organism
    • Preserves delicate parts of plant leaves and insects
  • 9. Preserved Remains
    • Organisms preserved with little or no change to original structure
    • Occurs when organism is trapped in a substance that assists in the preservation
      • Tar, amber, ice
  • 10. Preserved Remains
    • Provides evidence of
      • Physical structures that are often lost through other fossilization processes
  • 11. Trace Fossils
    • Provides evidence of the activities of ancient organisms
    • Examples include footprints, burrows and trails
  • 12. Reflection Page 40
    • Identify which of the 6 fossils types is the most important for scientists as they unravel the history of the earth
      • Justify your answer!!
  • 13.