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Ohio's Geologic Timeline

From Ohio History Central
Revision as of 17:11, 24 April 2013 by Unknown user (talk)


Since the oldest sedimentary rocks in Ohio were deposited first, they lie below the youngest rocks. Therefore, if a layer of sedimentary rock lies on top of another layer of such rock, the top layer is younger than that beneath it. This holds true in Ohio EXCEPT in cases where a force has disturbed the layers after they were deposited.

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