Minturn Fm in west-central and south-central and other units

What the map says

Arkosic sandstone, conglomerate, shale, and limestone. Includes Madera Fm and Sharpsdale Fm of Chronic (1958) in Sangre de Cristo Range and Gothic Fm of Langenheim (1952) in Elk Mountains. Other units of Middle Pennsylvanian age. Lithology: arkose, conglomerate, shale, minor limestone.

1:500,000 sheet: Horton and others, 2017, U.S. Geological Survey Data Series 1052 (8 crags). 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.