Hunter Canyon Formation of the Mesaverde Group
Late Cretaceous, about 86 to 66 million years old. 3 crags on this site have their map point on it.
What the map says
Buff and gray medium- to coarse-grained massive cliff-forming sandstone and gray to greenish-gray shale. Thickness 375 to 1,400 ft. Lithology: clastic; sandstone; shale.
1:100,000 sheet: Day and others, 1999, U.S. Geological Survey Open-File Report 99-0427 (3 crags). A contact line at that scale is about 100 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.