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Ge ologic Time

This article explores the concepts of relative and absolute dating in geologic time, including the use of fossils and cross-cutting relationships. It also discusses the significance of unconformities in understanding the Earth's history.

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Ge ologic Time

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  1. Geologic Time

  2. Geologic Time • Relative dating by superposition, cross-cutting relationships, fossils and evolution • Absolute dating by radioactive decay (igneous)

  3. Relative Time: The Law of Superposition

  4. Cretaceous Ammonites Ordovician Brachiopods Devonian Fish Cambrian Trilobite

  5. Relative Time:Correlating Strata

  6. Relative Time:Correlating Strata

  7. Relative Time:Correlating Strata

  8. Relative Time:Correlating Strata

  9. Relative Time:Constructing the Geologic Timescale

  10. The greater the variety of fossils the more precise the time determination

  11. Absolute Time

  12. Absolute Time

  13. Absolute Time

  14. Absolute Time

  15. Sequence of Events

  16. Timing of Intrusion

  17. Sequence of Events

  18. Unconformities: Disconformity

  19. Unconformities: Disconformity

  20. Unconformities: Disconformity

  21. Unconformities: Disconformity

  22. Unconformities: Angular Unconformity

  23. Unconformities: Angular Unconformity

  24. Unconformities: Angular Unconformity

  25. Unconformities: Angular Unconformity

  26. Unconformities: Angular Unconformity

  27. Unconformities: Non-conformity

  28. Unconformities: Non-conformity

  29. Unconformities: Non-conformity

  30. Unconformities: Non-conformity

  31. Geologic Time

  32. The Grand Canyon and the Great Unconformity

  33. Sequence of Events

  34. Sequence of Events

  35. Geologic Time • Sequence of Events by superposition, cross-cutting relationships, fossils and evolution

  36. Sequence of Events

  37. Sedimentary Facies: Time vs. stratigraphic units

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