Results: 1 - 3 of 3
Apr 30, 2012
Open File Report
… by sulphur-stained, dark grey shale of the Westgate Formation. A … bentonite units in the otherwise shale-dominated Fish Scales … the Belle Fourche Formation is shale dominated with silty lenses, …
Dec 31, 1974
Earth Sciences Report
Dec 31, 1999
Earth Sciences Report
… material (e.g., anhydrite and shale beds) has been considered. As …