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Evolution Through Fossils: Evidence of Change Over Time in the Fossil Record

This unit explores how the fossil record provides evidence for the evolution of animals over time, highlighting examples such as the coelacanth and the law of superposition. Unique fossils like sharks and soft-bodied creatures challenge traditional views, including uniformitarianism and catastrophism. Discover how rapid sedimentation plays a critical role in fossilization, ensuring that even delicate forms, such as jellyfish, can be preserved. Through everything, remember the importance of making informed choices and avoiding drugs!

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Evolution Through Fossils: Evidence of Change Over Time in the Fossil Record

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  1. Unit 12Change Over Time How the fossil record is used to attempt to show evidence of animals changing over time.

  2. Seasons can show change over time

  3. Skeleton of a dog.

  4. Skeleton of a bulldog.

  5. Law of Superposition Newer Older

  6. Coelacanth as a fossil

  7. Coelacanth alive today.

  8. Sharks alive today

  9. Sharks preserved as a fossil

  10. Other “living” fossils

  11. Some thoughts…. • Uniformitarianism doesn’t explain how we find soft-tissue animals in the fossil record. • Slow deposition over time simply takes too long • Soft bodied animals like jellyfish would be either rotted away or eaten by scavengers. • Catastrophism can explain how a jellyfish can be fossilized.

  12. In order for a fish giving birth to fossilized, it has to be covered instantly with sediments, at the moment it occurs.

  13. In order for a fish eating a fish to fossilized, it has to be covered instantly, at the moment it occurs.

  14. This is a trilobite and the tracks it made just prior to be covered up by a massive and sudden amount of sediments!

  15. Remember! Don't Do Drugs!

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