Geologic Time

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Geologic Time
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Geologic Time

• Relative dating by superposition, cross-cutting
  relationships, fossils and evolution
• Absolute dating by radioactive decay (igneous)

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Relative Time The Law of Superposition
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Cretaceous Ammonites
Ordovician Brachiopods
Devonian Fish
Cambrian Trilobite
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Relative TimeCorrelating Strata
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Relative TimeCorrelating Strata
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Relative TimeCorrelating Strata
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Relative TimeCorrelating Strata
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Relative TimeConstructing the Geologic
Timescale
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The greater the variety of fossils the more
precise the time determination
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Absolute Time
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Absolute Time
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Absolute Time
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Absolute Time
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Sequence of Events
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Timing of Intrusion
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Sequence of Events
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Unconformities Disconformity
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Unconformities Disconformity
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Unconformities Disconformity
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Unconformities Disconformity
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Unconformities Angular Unconformity
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Unconformities Angular Unconformity
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Unconformities Angular Unconformity
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Unconformities Angular Unconformity
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Unconformities Angular Unconformity
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Unconformities Non-conformity
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Unconformities Non-conformity
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Unconformities Non-conformity
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Unconformities Non-conformity
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Geologic Time
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The Grand Canyon and the Great Unconformity
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Sequence of Events
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Sequence of Events
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Geologic Time

• Sequence of Events by superposition,
  cross-cutting relationships, fossils and evolution

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Sequence of Events
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Sedimentary Facies Time vs. stratigraphic units
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