Pierre Shale (Kp), Niobrara (Kn), and Carlile, Greenhorn, and Graneros (Kcg) Fms, undivided
Late Cretaceous, about 97 to 84 million years old. 2 crags on this site have their map point on it.
The map groups these named formations into this unit: Pierre Shale, Niobrara Formation, Carlile Formation, Greenhorn Formation, Graneros Shale.
What the map says
The sheet gives no description for this unit. Lithology: shale, limestone.
1:500,000 sheet: Horton and others, 2017, U.S. Geological Survey Data Series 1052 (2 crags). A contact line at that scale is about 500 m wide on the ground.
Served by Macrostrat (CC BY 4.0). The wording is the map's own, quoted as a fact about the mapped unit, not about any one wall.