Revision of Lower Ordovician Nomenclature in the Upper Mississippi Valley
- 1 May 1966
- journal article
- research article
- Published by University of Chicago Press in The Journal of Geology
- Vol. 74 (3) , 361-365
- https://doi.org/10.1086/627170
Abstract
Detailed study of more than forty exposures in the upper Mississippi valley area suggests a logical solution to stratigraphic nomenclature of the Lower Ordovician (Prairie du Chien) strata of this area. Examination of the type area of the Shakopee Formation indicates that strata cropping out in Shakopee, Minnesota, belong to the upper carbonate unit of the Prairie du Chien. The Prairie du Chien Group is comprised of the lower Oneota Dolomite and the upper Shakopee Formation. The Shakopee is subdivided into the New Richmond Sandstone Member and the Willow River Dolomite Member.Keywords
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