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November 2,2011

November 2,2011. Objective: To learn how geologists infer the logical sequence of events and establish a probable relative age for a series of rock layers. Agenda: Law of superposition notes Text book questions Page 204-205 answer questions 4,12,13 Geologic Timeline hanging

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November 2,2011

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  1. November 2,2011

  2. Objective: • To learn how geologists infer the logical sequence of events and establish a probable relative age for a series of rock layers • Agenda: • Law of superposition notes • Text book questions • Page 204-205 answer questions 4,12,13 • Geologic Timeline hanging • Lab: Law of Superposition

  3. Discovering Earth’s History • Principle of Uniformitarianism: • The forces and processes happening today have been going on for a long time

  4. Key Principles • Relative Dating • Tells us the sequence in which events occurred • Law of Superposition • In sedimentary rocks, each bed is older than the one above it and younger than the one below it

  5. Law of Superposition • Younger Layers→ • Older Layers→

  6. Ordering the Grand Canyon’s History

  7. Disturbed Rock Layers

  8. Relative Dating—Key Principles  Principle of Cross-Cutting Relationships • The principle of cross-cutting relationships states that when a fault cuts through rock layers, or when magma intrudes other rocks and crystallizes, we can assume that the fault or intrusion is younger than the rocks affected.

  9. Applying Cross-Cutting Relationships

  10. Formation of Inclusions

  11. Relative Dating—Key Principles  Unconformities • An unconformity represents a long period during which deposition stopped, erosion removed previously formed rocks, and then deposition resumed.

  12. Formation of an Angular Conformity

  13. Relative Dating—Key Principles  Unconformities • A break in the geologic record created when rock layers are eroded or when sediment is not deposited for a long period of time.

  14. A Record of Uplift, Erosion, and Deposition

  15. Correlation of Rock Layers or walking the outcrop  Correlation is establishing the equivalence of rocks of similar age in different areas.

  16. Correlation of Strata at Three Locations

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