Subject: Formations (Geology) / Year: 1987 - Yale University Library GeoBlacklight Search Results

Start Over Subject Formations (Geology) Year 1987

1. Geologic map of the frontal fold and thrust zone in the Blacktail Mountains, Beaverhead County, Montana [microform]

1987. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey : [Books and Open-file Reports Section, distributor]. English. Public. Montana and Beaverhead County.

2. Thickness of upper Cretaceous rocks from the base of the Niobrara Formation to the top of the Frontier Formation, including the Carlile shale, Greenhorn Formation, and Sage Breaks shale, Powder River Basin, Wyoming and Montana [microform]

1987. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey. English. Public. Powder River Basin (Wyo. and Mont.). Cretaceous.