Mount Garfield Formation and Sego Sandstone of the Mesaverde Group
Sandstone. Late Cretaceous, about 75 to 66 million years old. 2 crags on this site have their map point on it.
The map groups these named formations into this unit: Mount Garfield Formation, Sego Sandstone.
What the map says
Mount Garfield Formation: buff and gray fine- to medium-grained sandstone and gray shale. Upper part contains very little coal. Lower part contains thick persistent coal beds. Rollins Sandstone member occurs in coal-bearing sequence. Sego Sandstone: buff and light-gray fine-grained sandstone and gray shale. Lithology: clastic; sandstone; shale; coal.
1:100,000 sheet: Day and others, 1999, U.S. Geological Survey Open-File Report 99-0427 (2 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.