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How are chunks of time in the geologic timeline organized?

User Addeladde
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About the geologic time scale divisions
The geologic history of the Earth is broken up into hierarchical chunks of time. From largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

User Thinwybk
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Each chunk of time represents a time when fossil indicate that Earth's life forms were similar.
User Reena Upadhyay
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