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Fossils

Fossils. Mr. Skirbst Earth Science Topic 24. Fossils. The preserved remains or evidence of a living thing. Types of Fossils. Petrification. Types of Fossils. Petrification minerals replace organic material Ex. Petrified wood. Types of Fossils. Molds. Types of Fossils. Molds

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Fossils

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  1. Fossils Mr. Skirbst Earth Science Topic 24

  2. Fossils The preserved remains or evidence of a living thing

  3. Types of Fossils • Petrification

  4. Types of Fossils • Petrification minerals replace organic material Ex. Petrified wood

  5. Types of Fossils • Molds

  6. Types of Fossils • Molds empty space left by plant of animal buried in sediment

  7. Types of Fossils • Molds empty space left by plant of animal buried in sediment • Casts

  8. Types of Fossils • Molds empty space left by plant of animal buried in sediment • Casts a filled in mold

  9. Types of Fossils Molds & Casts CAST MOLD

  10. Types of Fossils • Imprints

  11. Types of Fossils • Imprints impression in soft sediment

  12. Types of Fossils • Preservation

  13. Types of Fossils • Preservation entire specimen preserved (hard and soft parts)

  14. Types of Fossils • Preservation entire specimen preserved (hard and soft parts) Freezing – trapped in ice

  15. Types of Fossils • Preservation entire specimen preserved (hard and soft parts) Freezing – trapped in ice Amber – trapped in sap

  16. Types of Fossils • Preservation entire specimen preserved (hard and soft parts) Freezing – trapped in ice Amber – trapped in sap Tar pit – trapped in tar

  17. Types of Fossils • Preservation entire specimen preserved (hard and soft parts) Freezing – trapped in ice Amber – trapped in sap Tar pit – trapped in tar Peat pit – trapped in peat / bog

  18. Types of Fossils • Trace Fossils

  19. Types of Fossils • Trace Fossils tracks, trails, footprints

  20. Age of Fossils

  21. Age of Fossils 1. Relative Age:

  22. Age of Fossils 1. Relative Age: - determining age “relative” to others

  23. Age of Fossils Law of Superposition

  24. Age of Fossils Law of Superposition in sedimentary rock layers, older rocks are beneath younger rocks

  25. Age of Fossils Law of Superposition YOUNG OLD

  26. Age of Fossils Index Fossils

  27. Age of Fossils Index Fossils - layers of rock with index fossils are close in age to other layers with the same kind of fossils

  28. Age of Fossils 1 Index Fossils 2 1 3 2 3 4

  29. Age of Fossils 2. Absolute Age

  30. Age of Fossils 2. Absolute Age determining the “actual” age of fossils

  31. Age of Fossils Radioactive Dating

  32. Age of Fossils Radioactive Dating - radioactive elements decay at a constant rate

  33. Age of Fossils Radioactive Dating - radioactive elements decay at a constant rate Half-life – time it takes for ½ of element to decay

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