Tidal Deposits pp 299-306 | Cite as

Intertidal and Associated Deposits of the Prairie du Chien Group (Lower Ordovician) in the Upper Mississippi Valley

  • Richard A. DavisJr.
Conference paper


The Prairie du Chien Group represents the lowermost Ordovician sequence in the Upper Mississippi Valley. Although rarely are fossils preserved, conodonts in this sequence have been identified as being Tremodocian in age., This sequence of dolomites represents the earliest Paleozoic carbonate deposits in the upper midwest area of the United States. Exposures of the Prairie du Chien form the prominent bluffs along the Mississippi River and adjacent coulees in Minnesota, Iowa, and Wisconsin (Fig. 34-1). Numerous quarries and roadcuts also provide access to these strata.


Quartz Sandstone Ancient Carbonate Algal Structure Wisconsin Alumnus Research Foundation Lithic Type 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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© Springer-Verlag New York Inc. 1975

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  • Richard A. DavisJr.

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