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What are the 2 methods of dating in Geologic Time?

What are the 2 methods of dating in Geologic Time?. __________ and _______________ studied features preserved in rocks & present-day geologic processes. Why is Sir Charles Lyell important? Uniformitarianism . Seven principles of relative dating: . . . . . . .

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What are the 2 methods of dating in Geologic Time?

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  1. What are the 2 methods of dating in Geologic Time?

  2. __________ and _______________ studied features preserved in rocks & present-day geologic processes. Why is Sir Charles Lyell important? Uniformitarianism

  3. Seven principles of relative dating: • . • . • . • . • . • . • . Who formulated these principles? Who expounded upon these principles?

  4. Original horizontality Superposition Lateral continuity Grand Canyon, Ariz.

  5. A B Inclusions In A & C, granite contains inclusions & is younger than the inclusions. • In B, sandstone is younger than the granite b/c it contains inclusions of granite. Wisconsin C

  6. Ontario, Canada Castaic, Ca Cross-cutting relationships

  7. Principle of deformed rocks

  8. Types of Unconformities What areconformable contacts? Unconformities What is a hiatus?

  9. What is a Disconformity? • How are disconformities recognized?

  10. What is an Angular unconformity? James Hutton = 1st to recognize & understand the significance of an angular unconformity Siccar Point, Scotland

  11. What is a Nonconformity?

  12. What is correlation? Why do geologists use correlation? Factors: What are Key beds?

  13. Why are fossils important? What are Index fossils?

  14. What is Faunal succession?

  15. Absolute-Dating • ___________________________discovered radioactivity in 1903. • Radiometric dating • Radioactivity • Isotopes

  16. Radioactive decay Alpha decay Beta decay Electron capture

  17. Half-Lives

  18. Geologic Time Scale www.acs.appstate.edu/~hagemans/timescale.html How was the Geologic Time Scale Developed?

  19. Can sedimentary rocks be dated radiometrically? Explain. How are they dated?

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