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There will only be a record of a given part of geologic time if sediment was laid down at that time. For any given time period, there are regions in which sediment was not laid down. Addtionally, even where the sediment was laid down, some may been eroded and the rock record destroyed. Additionally, in a region where rock from one time period are expossed, rocks from older periods, if they exist, will bur buried, often too deep to be accessible.

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Q: Why doesn't one region on earth contain a record of all geologic time?
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