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September 14 th

September 14 th. Are you ready for some Fossil time?. Candy Toss. Science style…. In what type of rock do fossils form?. The law of superposition helps geologists determine the absolute age of a rock layer. T or F. What is the law of superposition?. What is the law of Uniformitarianism.

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September 14 th

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  1. September 14th Are you ready for some Fossil time?

  2. Candy Toss Science style…..

  3. In what type of rock do fossils form?

  4. The law of superposition helps geologists determine the absolute age of a rock layer. T or F

  5. What is the law of superposition?

  6. What is the law of Uniformitarianism

  7. What is the law of original horizontality?

  8. Explain radioactive decay

  9. Fossil investigation Can you name the fossil?

  10. Fossil Lab • Migrate to each of the 12 fossil samples • Complete columns 1 – 3 • Complete column 4 after I place the Fact Cards next to each fossil sample. • Scrambled fossil names: • fish • brachiopod • gastropod • trilobite • echinoderm • tree • pelecypod • coral • shark's tooth • cephalopod • allosaur claw • fern

  11. Quiz Answers Date: 9/14 Section: GD Title: Geological Dating Quiz Page:

  12. Quiz Answers 1.

  13. Fossil Lab Chart – Separate Sheet of Paper Lab Assessment

  14. Fossil Coffee Talk What did you discover?

  15. What are Fossils?  Fossils are the remains or traces of prehistoric life. They are important components of sediment and sedimentary rocks.  The type of fossil that is formed is determined by the conditions under which an organism died and how it was buried.

  16. 2. Altered vs. Unaltered Remains

  17. A. Unaltered Remains • Some remains of organisms—such as teeth, bones, and shells—may not have been altered, or may have changed hardly at all over time.

  18. B. Altered Remains • The remains of an organism are likely to be changed over time. • Fossils often become petrified or turned to stone. • Molds and casts are another common type of fossil. • Carbonization is particularly effective in preserving leaves and delicate animals. It occurs when an organism is buried under fine sediment.

  19. 3. Indirect evidence  Indirect Evidence • Trace fossils are indirect evidence of prehistoric life.

  20. Trace Fossil

  21. 4. Preservation • Conditions Favoring Preservation • Most organisms do not become fossils… • Two conditions are important for preservation: rapid burial and the possession of hard parts.

  22. Preservation

  23. 5. What are the different kinds of fossils?

  24. a. Amber Amber

  25. #1 Amber

  26. b. Asphalt & Tar

  27. #2 Asphalt/Tar • Asphalt wells up in thick sticky pools. • Trapped and preserved organisms in asphalt.

  28. c. Petrified

  29. #3 Petrified Fossils • A process in which minerals replace the organism’s tissues. • Different types: • Pore space in bone/wood fills up with mineral • Organisms tissues are replaced by minerals

  30. d. Frozen

  31. #4 Frozen

  32. e. Molds & Casts

  33. Molds and Casts

  34. f. Trace

  35. Trace

  36. 6. Environments • a. Interpreting Environments • Fossils can also be used to interpret and describe ancient environments and changes that occurred (polar areas once being tropical) • They can identify extinct species and effects of catastrophism (floods, volcanic eruptions, earthquakes). • They can describe geologic changes (mountains once under water, Pangaea) • Shark tooth in Georgia?!?!

  37. Rocks on the mountain formed at the bottom of the ocean. Using fossils, scientists can tell whether the climate was cooler or more wet than present. b. Fossils on a Mountaintop?

  38. The Fossil Foldable – Tier 2 Fossilization

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