1. Maps showing formation temperatures and configurations of the tops of the Minnelusa Formation and the Madison Limestone, Powder River Basin, Wyoming, Montana, and adjacent areas [cartographic material] Yale Public content 1979. 2014-09-15T20:29:15Z. 2014-09-30T22:05:01Z. Head, William J. U.S. Geological Survey. English. Public. Powder River Basin (Wyo. and Mont.) and U.S.