History of Earth: using Fossils and Rock Layers to tell the story


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Students are working to understand how rocks tell the history or Earth. Presentation includes fossils and rock layers.

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History of Earth: using Fossils and Rock Layers to tell the story

  1. 1. Exploration of Earth History What evidence can we find in rocks?
  2. 2. Rocks tell the story of Earth’s History • Red Rock Canyon CO Devil’s Tower Wyoming Painted Desert Arizona
  3. 3. Rocks tell the story Link for image Rocks can provide evidence Age of the Earth Type of organisms Evolution of Species Environmental Changes
  4. 4. Original Remains Fossils that are the actual bodies or body parts
  5. 5. Who is ICE MAN? Who needs Ice if you have Maverick?
  6. 6. Ice Man from Himalayans 5,300-year-old corpse turned up on the mountain border between Austria and Italy in 1991
  7. 7. Ice Man Trapped
  8. 8. Ice Man Close Up
  9. 9. Inferences from NatGeo
  10. 10. Trapped in Amber
  11. 11. Tar Pits
  12. 12. Fossils in Sedimentary Rocks Image Link Mold: hollow area left by the living thing Cast: solid mineral deposit that filled the mold, leaving a copy Image Link
  13. 13. Trace Fossils Trace: tracks, burrows, nests Image Link Image Link
  14. 14. Petrification tissue replaced by minerals
  15. 15. Carbon Films
  16. 16. Ice Core Samples
  17. 17. Relative Dating How old something is in comparison to something else
  18. 18. Index Fossils Only around for short periods of time
  19. 19. Ammonite Found in sedimentary rock layers about 400 million years ago
  20. 20. Trilobite Fossils show: Biodiversity How species have changed over time Correlation between rock layers from around the world Relative ages to particular strata Evidence for the geological time scale
  21. 21. Law of Superposition Law that states the older layers were laid down first, then younger materials was put down on top of it Younger Igneous Rock can cut through rock layers
  22. 22. Closer Look at Rock Layers Do you see evidence of Erosion Earthquake A river
  23. 23. Principles of Crosscutting The geologic feature which cuts another is the younger of the two features
  24. 24. What kind of rocks are these fossils in? Which layer is oldest? Which layer is youngest? How do you know?
  25. 25. Intrusions vs Extrusions Intrusion: when magma cools within the earth Always younger than the rock around it Extrusion: when lava cools outside the earth Image A Image B Image C
  26. 26. Is this an Igneous Intrusion?
  27. 27. What evidence do we see in these Road Cuts? Image A Image B Image C III Image D Image E Image F
  28. 28. Did the fold happen before the red rock was deposited?
  29. 29. What could have caused F? When did it happen?
  30. 30. Did the eruption happen before or after layer H?
  31. 31. What story does these rocks tell? Where is the river?
  32. 32. Between which two layers was a fast moving river?
  33. 33. Absolute Dating The actual age of the event Half Life: the length of time it takes for half of the atoms in a sample of a radioactive element to change from an unstable form into another form