Broadway Alluvium
Cenozoic, about 2.6 to 0.0 million years old. 4 crags on this site have their map point on it.
What the map says
Sand and gravel deposited by the South Platte River and its tributaries. Well-sorted and well-stratified; size analyses indicate that the average size distribution is 50% sand, 25% granules and 25% pebbles. Poorly developed Brown soil profile of early Ho
1:100,000 sheet: Colton, Roger B., 1976, U.S. Geological Survey Geologic Investigations Series I-855-G (4 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.