Madison Group
The Madison Limestone is a thick sequence of mostly carbonate rocks of Mississippian age in the Rocky Mountain and Great Plains areas of western United States. The rocks serve as an important aquifer as well as an oil reservoir in places. The Madison and its equivalent strata extend from the Black Hills of western South Dakota to western Montana and eastern Idaho, and from the Canadian border to western Colorado and the Grand Canyon of Arizona.
Read more about Madison Group: Age and Nomenclature, Lithology, Subdivisions
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