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FOSSILS

FOSSILS. Fossils. Is any preserved evidence of an organism Plants, animals, and even bacteria can form fossils Not all organisms fossilize. Most organisms decompose before they have a chance to become fossilized. 6 Types of fossils. Trace fossil Molds and casts Replacement

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FOSSILS

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  1. FOSSILS

  2. Fossils • Is any preserved evidence of an organism • Plants, animals, and even bacteria can form fossils • Not all organisms fossilize. Most organisms decompose before they have a chance to become fossilized.

  3. 6 Types of fossils • Trace fossil • Molds and casts • Replacement • Petrified or Permineralized • Amber • Original material

  4. 1) Trace Fossils • Indirect evidence left by an organism • Examples: Footprints and Burrows

  5. 2) Molds and casts • A mold is an impression of an organism • A cast is a mold filled with sediment

  6. 3) Replacement • Original material of an organism is replaced with mineral crystals

  7. 4) Petrified or permineralized • Empty pore spaces are filled in by minerals, such as in petrified wood

  8. 5) Amber • Preserved tree sap traps an entire organism

  9. 6) Original material • Mummification or freezing preserves original organisms

  10. Paleontologist • People who study fossils • He or she attempts to read the record of life in rocks.

  11. Fossils tell us: • Organisms before have evolved from earlier organisms • When species have become extinct • Compare homologous and vestigial structures • Date of when organism/fossil existed

  12. Geological Time Scale • A model that expresses the major geological and biological events in Earth’s history

  13. What makes a geological time period? • Periods are divisions in an Era • At the end of each time period, an event occurred leading to large percentage of living things becoming extinct • This event is known as Mass Extinction • http://youtu.be/FlUes_NPa6M

  14. Mass Extinctions • The last mass extinction occurred about 65 million years ago when the last surviving dinosaurs became extinct

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