Lyons Sandstone
Sandstone. Permian, about 282 to 273 million years old. 5 crags on this site have their map point on it.
What the map says
Moderate-orange, pink to pinkish-gray, fine- to medium-grained, firmly cemented, well-sorted, cross-stratified, quartzose sandstone; about 77 m thick in Boulder area, 108 m in Lyons quadrangle, but only 6 m thick northwest of Ft. Collins; at Greeley it i
1:100,000 sheet: Colton, Roger B., 1976, U.S. Geological Survey Geologic Investigations Series I-855-G (5 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.