Dakota, Purgatoire, Morrison, Ralston Creek, and Entrada Fms in southeast. Dakota, Morrison, and Entrada Fms in central mountains. Dakota, Burro Canyon, Morrison, Wanakah, and Entrada Fms in Gunnison River area. Dakota, Morrison, Curtis, And Entrada F
Mesozoic, about 166 to 100 million years old. 1 crag on this site has its map point on it.
The map groups these named formations into this unit: Dakota Formation, Purgatoire Formation, Morrison Formation, Ralston Creek Formation, Entrada Sandstone, Burro Canyon Formation, Wanakah Formation, Curtis Formation.
What the map says
The sheet gives no description for this unit. Lithology: sandstone, mudstone, limestone, minor shale, claystone.
1:500,000 sheet: Horton and others, 2017, U.S. Geological Survey Data Series 1052 (1 crag). 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.