1. Geologic structure and altitude of the top of the Minnelusa Formation, northern Black Hills, South Dakota and Wyoming, and Bear Lodge Mountains, Wyoming, 1985 Yale Public content 1987. 2002-06-01T04:00:00Z. 2009-02-23T15:01:40Z. Geological Survey (U.S.). The Survey ; Books and Open-File Reports Section [distributor]. English. Public. Black Hills (S.D. and Wyo.) and Bear Lodge Mountains (Wyo.).