Image: USGS Decorah crater
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Description: Recent airborne geophysical surveys near Decorah, Iowa are providing an unprecedented look at a 470- million-year-old meteorite crater concealed beneath bedrock and sediments.
Title: USGS Decorah crater
Credit: USGS resistivity map of the Decorah crater, url=http://www.usgs.gov/newsroom/article.asp?ID=3521.
Author: USGS
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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