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Fossils PowerPoint Presentation

Fossils

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Fossils

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Presentation Transcript

  1. Fossils Remains of Ancient Plants And Animals, Evidence of Life

  2. Commonly Preserved: Hard Parts of Organisms: • Bones • Shells • Hard Parts of Insects • Woody Material

  3. Rarely Preserved Soft or Easily Decayed Parts of Organisms: • Internal Organs • Skin • Hair • Feathers

  4. Types of Fossils • Original Material • Casts & Molds • Replacement (Petrified Wood) • Carbonized Films (Leaves) • Footprints, Tracks, Etc. • “Trace Fossils” – Our only preserved record of behavior of fossil organisms

  5. Pseudofossils Look Like Fossils But Aren't • Dendrites • Concretions

  6. Pseudofossils

  7. A Pseudofossil

  8. Natural or Sculpture?

  9. Johannes Beringer’s “Fossils”

  10. Beringer’s Book

  11. Where Fossils Occur Almost Exclusively in Sedimentary Rocks • Heat of Melting or Metamorphism Would Destroy Almost Every Type of Fossil • Rare Exceptions: • Some Fossils in Low-grade Metamorphic Rocks • Trees Buried by Lava Flow To Be Preserved, Organisms Have to Be: • Buried Rapidly After Death • Preserved From Decay

  12. Good Index Fossils • Abundant • Widely-distributed (Global Preferred) • Short-lived or Rapidly Changing

  13. Correlation Correlation

  14. The Geologic Time Scale