Granodiorite and monzogranite
Granite. Mesoproterozoic, about 1,600 to 1,000 million years old. 3 crags on this site have their map point on it.
What the map says
Gray to light-pinkish-gray, medium- to coarse-grained, equigranular to porphyritic biotite-plagioclase-microcline-quartz granitoid rocks. Unit consists of two distinct phases: medium-grained rock of approximate monzogranite composition intrudes coarse-grained rock of approximate granodiorite composition. Forms an irregular-shaped pluton near Empire and a larger pluton along Continental Divide near north margin of quadrangle. Formerly considered part of the Routt Plutonic Suite, but preliminary U-Pb zircon ages between 1,435 and 1,425 Ma on two granodiorite samples and one monzogranite sample demonstrate these plutons are part of the Berthoud Plutonic Suite (W.R. Premo, unpub. data, 2006)
1:100,000 sheet: Kellogg and others, 2008, USGS Geologic Investigations Series 3000 (3 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.