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http://epod.usra.edu/blog/2011/10/ancient-marine-worm-tracks.html

http://www.geograph.org.uk/photo/107618

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http://lams.slcusd.org/pages/teachers/saxby/wordpress/?p=1262

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http://www.geolsoc.org.uk/gsl/geoscientists/page3473.html

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http://www.gsi.ie/Programmes/Heritage+and+Planning/Archives/Du+Noyer+Collection.htm

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http://marlimillerphoto.com/SrU-24.html

http://tin.er.usgs.gov/geology/state/sgmc-unit.php?unit=NYOag%3B3