Granodiorite and monzogranite of unknown age
Granite. Proterozoic, about 2,500 to 1,000 million years old. 1 crag on this site has its map point on it.
What the map says
Gray, medium- to coarse-grained, equigranular to porphyritic, massive to weakly foliated quartz-plagioclase-microcline-biotite ±hornblende tonalite, granodiorite, and monzo-granite. May include a younger, medium-grained monzogranite phase and an older, medium- to coarse-grained granodiorite phase. Most rocks of unit similar to Boulder Creek Granodiorite (XgdB), but here mapped separately due to uncertainty in age and whether derived from same magma and intrusive event as Boulder Creek Granodiorite (Tweto, 1987). Dated Middle Proterozoic rocks similar to Early Proterozoic Boulder Creek Granodiorite, such as granodiorite of the Mount Evans batholith (YgdM) and granodiorite and monzogranite unit (Ygd), attest to the difficulty in assigning a Middle or Early Proterozoic age to some granodiorites and monzogranites
1:100,000 sheet: Kellogg and others, 2008, USGS Geologic Investigations Series 3000 (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.