1. Potentiometric surfaces, altitudes of the tops, and hydrogeology of the Minnelusa and Madison Aquifers, Black Hills area, Wyoming Yale Public content 2002. 2002-10-24T19:15:08Z. 2011-03-03T23:20:41Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Wyoming, Crook County, Weston County, Madison Aquifer, and Black Hills (S.D. and Wyo.).