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1
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- Division of Geologic Time
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2
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- Scientists divide geologic time into units- based on fossil records of
extinct organisms and the law of superposition
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3
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- The largest division of geological time.
- The end of each Era is usually marked by the extinction of the era’s
major organism.
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4
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- Era’s are divided into smaller units of time called Periods.
- Periods are divided into even smaller time units called Epochs.
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Notes
