Dakota Sandstone
Sandstone. Cretaceous, about 113 to 95 million years old. 1 crag on this site has its map point on it.
What the map says
Gray and brown, fine- to coarse-grained, thin- to medium-bedded, commonly cross-bedded sandstone, locally conglomeratic in basal part; and small amounts of commonly medium-gray to very dark gray and rarely greenish-gray, carbonaceous siltstone and shale. Locally proportion of shale equal to sandstone. Unit contains commonly impure lenticular coal beds. Contact with underlying Burro Canyon Formation is an erosional hiatus and is placed at base of conglomeratic sandstone or carbonaceous shale. Thickness ranges from approximately 45m (150 ft) to 60m (200 ft).
1:100,000 sheet: Gualtieri, J.L., 1988, U.S. Geological Survey Miscellaneous Investigations Map I-1765 (1 crag). 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.