Image: Blue Rock, at Plum Creek in Nugget Lake County Park
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Description: This exposed Prairie du Chien sandstone, known as Blue Rock, which typically displays horizontal stratification, was uplifted by the impact and forced to the edge of the crater.
Title: Blue Rock, at Plum Creek in Nugget Lake County Park
Credit: Own work
Author: InexorableAlloy
Usage Terms: Creative Commons Zero, Public Domain Dedication
License: CC0
License Link: http://creativecommons.org/publicdomain/zero/1.0/deed.en
Attribution Required?: No
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