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Interpreting Geologic History. Earth and Space Science Earthcomm : Understanding Your Environment, pages 53-55. Geologic events such as deposition, erosion, folding, faulting, uplift, subsidence, igneous intrusion , volcanism, and metamorphism have changed the crust over time.

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interpreting geologic history

Interpreting Geologic History

Earth and Space Science

Earthcomm: Understanding Your Environment, pages 53-55

slide2

Geologic events such as deposition, erosion, folding, faulting, uplift, subsidence, igneous intrusion, volcanism, and metamorphism have changed the crust over time.

slide3

- Uplift – process where areas of the Earth’s

crust are slowly raised due to

expansion of the surrounding rock layers

  • rocks tend toexpand when heated
slide4

- Subsidence – process where areas of the

Earth’s crust slowly sink due to

the contraction of surrounding rocks

 rocks tend to contract when cooled

6 basic geologic principles
6 Basic Geologic Principles
  • Check out this website
  • YouTube clip
  • Helpful website
1 principle of superposition
1. Principle of Superposition
  • Younger sedimentary and volcanic rocks are deposited on top of older rocks
2 principle of original horizontality
2. Principle of Original Horizontality
  • Sedimentary and volcanic rocks are laid down in approximately horizontal layers
3 principle of lateral continuity
3. Principle of Lateral Continuity
  • Sedimentary and volcanic rocks are laid down in layers that are usually much wider (lateral extent) than they are thick
4 principle crosscutting relationships
4. Principle Crosscutting Relationships
  • If one

rock or

geologic

structure

cuts

across

another

rock unit

or geologic feature the cutter is younger than

the rock which is being cut

5 the law of included fragments
5. The law of included fragments
  • The fragments that make up a rock are older than the entire sample.
6 the law of folds or tilts
6. The Law of Folds or Tilts:
  • Tilts in rocks are younger than the rocks themselves.
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