Fossils
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Fossils

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Fossils Fossils Presentation Transcript

  • Fossils Ch 6 Section 4 P. 166-171
  • Fossil
    • The remains or physical evidence of an organism preserved by geological processes.
      • Most often preserved in sedimentary rock.
      • Sediment slows down decay.
      • Bones and shells resistant to decay, so they are more commonly preserved than soft tissue.
  • Fossils Continued
    • Fossil Examples
    • 1) Fossils in rock
    • 2) Fossils in amber (amber means tree sap) (fossils in tree sap)
    • 3) Petrification the organism's (plant or animal) tissue is replaced by minerals
    • 4) Fossils in asphalt (pavement)
    • 5) Frozen Fossils
    • 6) Trace Fossils a fossilized mark that is formed in soft sediment by the movement of an animal. (dinosaur tracks, dear tracks, tail markings)
    • 7) Mold a mark or cavity made in a sedimentary surface by a shell or other body.
    • (indentation in rock)
    • 8) Cast a type of fossil that forms when sediment fills in the cavity left by a
    • decomposed organism. (object is created, like the TREX tooth)
    • Index Fossil a fossil that is found in only one geologic rock layer and is used to find the age of the rock layers.
  • Amber Fossils
    • Hardened tree sap
      • Bugs, lizards and frogs found here.
  • Petrified Fossils
    • A process in which minerals replace the organism’s tissues.
      • Different types:
        • Pore space in bone/wood fills up with mineral
        • Organisms tissues are replaced by minerals
  • Fossils in Asphalt
    • Asphalt wells up in thick sticky pools.
    • Trapped and preserved organisms in asphalt.
  • Frozen Fossils
    • Cold temperatures slow down decay.
    • Many types of frozen fossils are preserved from the last ice age.
  • Trace Fossils
    • Any naturally preserved evidence of animal activity.
    • Footprints fill with sediment.
      • Tracks reveal how big the animal was & how fast it moved.
      • Shelters made by animals.
      • Animal poop
  • Molds and Casts
    • Mold: A cavity in rock where a plant or animal was buried.
    • Cast: an object created when sediment fills a mold and becomes a rock.
  • Fossils on a Mountaintop?
    • Rock on the mountain formed at the bottom of the ocean.
    • Using fossils, scientists can tell whether the climate was cooler or wetter than present.
  • Fossils Help Date Rocks
    • Index Fossils: fossils of organisms that lived during a relatively short, well-defined geologic time span.