Mineralogy and Stratigraphy of the Lower Part of the Pierre Shale, South Dakota and Nebraska mineralogical data that clarify stratigraphic relations of the Gregory and Crow Creek M... von Schultz, Leonard G.

“… Studies of the Pierre Shale in the Northern Great Plains …”

Stratigraphy of the Pierre Shale, Valley City and Pembina Mountain areas, North Dakota five lithologic subdivisions of the Pierre Shale in eastern North Dakota correlated with equi... von Gill, James R., Cobban, William A.

“… Studies of the Pierre Shale in the northern great plains …”