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2. Isopach : Inyan Kara Formation

Yale Public content
1987. 2008-09-04T13:47:56Z. 2011-03-25T21:38:24Z. Moore, Walter L., 1916-. North Dakata Geological Survey. English. Public. North Dakota. Cretaceous.
1996. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by U.S.G.S. Information Services. English. Public. Powder River Watershed (Wyo. and Mont.). Cretaceous, Jurassic, Pennsylvanian, Permian, and Triassic.