Interpreting geologic history
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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

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Interpreting geologic history

Interpreting Geologic History

Earth and Space Science

Earthcomm: Understanding Your Environment, pages 53-55


Interpreting geologic history

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


Interpreting geologic history

- 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


Interpreting geologic history

- 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

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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.


Geologic cross section 1

Geologic Cross-section #1


Geologic cross section 2

Geologic Cross-section #2


Geologic cross section 3

Geologic Cross-section #3


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