Image: Decorah Formation in Decorah Iowa
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Description: Decorah Formation (Upper Ordovician) exposed in Decorah, Iowa. The Decorah is gray; above it is the brown Cummingsville Formation.
Title: Decorah Formation in Decorah Iowa
Credit: Own work
Author: Wilson44691
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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