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Encyclopedia Dubuque

www.encyclopediadubuque.org

"Encyclopedia Dubuque is the online authority for all things Dubuque, written by the people who know the city best.”
Marshall Cohen—researcher and producer, CNN

Affiliated with the Local History Network of the State Historical Society of Iowa, and the Iowa Museum Association.




GEOLOGY: Revision history

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27 February 2010

19 September 2009

15 August 2008

20 July 2008

  • curprev 22:0922:09, 20 July 2008Randylyon talk contribs 2,011 bytes +2,011 New page: GEOLOGY. Ordovician rocks in the Dubuque area were formed from deposits made in shallow water that covered this region as much as 475 million years ago. The middle portion of Iowa's Ordovi...