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Fossils - PowerPoint PPT Presentation


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Fossils. 4 Types of Fossils. 1. Body Fossils 2. Trace Fossils 3. Mold 4. Casts. Body Fossils. The entire body of an organism is preserved. For example… a small bug trapped inside tar ( Jurrassic Park)

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4 types of fossils
4 Types of Fossils
  • 1. Body Fossils
  • 2. Trace Fossils
  • 3. Mold
  • 4. Casts
body fossils
Body Fossils
  • The entire body of an organism is preserved.
  • For example…
    • a small bug trapped inside tar

(Jurrassic Park)

- Herds of animals discovered in a tar pit (animals may have thought it was a watering hole, became stuck and died)

trace fossils
Trace Fossils
  • Portion of an organism preserved.
  • For example…
    • Footprints
    • Bones
    • Teeth
    • Animal poo
    • Nests
mold fossils
Mold Fossils
  • Mold fossils are made by an organism’s impression (imprint) in the sediment.
  • The impression then becomes packed with many layers of sediment.
cast fossils
Cast Fossils
  • Cast fossils are exact replicas of the original organism.
  • When the organism dies and becomes covered with sediments, the impression fills with water.
  • The water dries up leaving the minerals from the water behind.
  • The minerals harden over time and take the shape of the organism.