Median-permeability contour maps of the J sandstone, Dakota Group, in the Denver Basin, Colorado, Nebraska, and Wyoming /

Published 1986

Thickness of upper Cretaceous rocks from the base of the Niobrara Formation to the base of the clay spur bentonite (top of lower Cretaceous rocks), Powder River Basin, Wyoming and...

Published 1987

Thickness of lower Cretaceous rocks, Powder River Basin, Wyoming and Montana /

Published 1987

Thickness of Jurassic rocks, Powder River Basin, Wyoming and Montana /

Published 1987

Thickness of Triassic rocks, Powder River Basin, Wyoming and Montana /

Published 1987