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Fossils

Fossils. Fossils. Fossils - the preserved remains or evidence of living things. Types of Fossils. Original Remains- Unchanged remains of plants and animals Examples Hard parts : Bones, Shells Animals trapped in ice : Wooly Mammoth Animals trapped in tar or in amber.

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Fossils

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  1. Fossils

  2. Fossils • Fossils- the preserved remains or evidence of living things

  3. Types of Fossils • Original Remains-Unchanged remains of plants and animals • Examples • Hard parts: Bones, Shells • Animals trapped in ice: Wooly Mammoth • Animals trapped in tar or in amber

  4. Amber with an insect Saber-toothed Tiger Frog in Amber Woolly Mammoth in ice

  5. Fossilized dinosaur bones in sandstone (sedimentary rock)

  6. The La Brea tar pit in Los Angeles, California is famous for its many fossils! Tar is thick and sticky

  7. Types of Fossils • Replaced Remains: Hard parts of plants or animals are replaced byminerals over time. The minerals are in the shape of the organism. • This occurs when water containing minerals seeps through the plant/animal material. • Petrified wood forms in this way

  8. Example: Petrified Wood Minerals have replaced all of the wood cells and turned this wood into rock!

  9. Types of Fossils • Molds and Casts: Impressions and copies • Molds are created as mud or sediment becomes rock around dead organisms. • Casts are created as minerals get deposited into the molds and then harden. They make a copy of the fossil. Ice= Cast Ice cube tray= Mold

  10. Example: Cast of an Ammonite

  11. Types of Fossils • Trace Fossils: Evidence of organisms • Footprints, teeth marks, tunnels • Carbonaceous film: thin film of carbon resembling a silhouette of the organism

  12. Trilobite: Index fossil of Paleozoic • Graptolite: Index fossil of the Silurian

  13. Question: • Fossils are usually formed when the organism dies and gets buried in mud or sand. As a result, What type of rock are fossils usually found in?

  14. Questions: • Why are fossils NOT usually found in igneous rock?

  15. Questions: • What 4 settings (environments) could fossils be preserved?

  16. Questions: • What are the 5 types of fossils?

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