Roadcut West of Stockton, Kansas by Ron Schott

The Niobrara Formation, Fort Hays Member here conformably overlies the Blue Hill Shale member of the Carlile Shale. The Codell Sandstone member of the Carlile Shale is not present here although the uppermost shaly layers of the Blue Hill are somewhat sandier than lower down. All units are Cretaceous in age and were deposited in the Western Interior Seaway. A minor fault cuts obliquely through the Fort Hays chalk beds almost parallel to the face of the roadcut in the center of the field of view; slickensides are visible in the first snapshot, indicating dip-slip displacement.