Rock and Fossil Record

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Rock and Fossil Record

• Chapter 3

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Uniformitarianism

• Same geologic processes at work in past and today
• James Hutton

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Catastrophism

• All geologic change occurs suddenly
• Accepted for decades

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Modern Geology

• Most geologic change is gradual
• Catastrophes do occur

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Relative Dating

• Age relative to something else
• Use rocks and fossils

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Principle of Superposition

• Young rocks lie over top old rocks

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• Assume rocks are put down in layers
• Assume layers are undisturbed

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Geologic Column

• Ideal sequence of all rock layers and known
  fossils

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Disturbing Rock Layers
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Faults
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Folding
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Unconformity

• A missing part of the areas geologic record

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• Rock layers are eroded
• Covered by new deposition

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