Granite of Hagues Peak
Granite. Mesoproterozoic, about 1,600 to 1,000 million years old. 2 crags on this site have their map point on it.
What the map says
Tan, coarse-grained to very coarse grained, porphyritic biotite-rich monzogranite and granodiorite. Contains conspicuous flow-aligned phenocrysts of microcline 2 to 6 cm long. Color index generally 10 to 15. The granite of Hagues Peak is intruded by the granite of Longs Peak (YgLP), and yields a whole-rock Rb-Sr isochron age of approximately 1,480 Ma (Braddock and Cole, 1990). Plymate and others (2005) indicate bulk geochemistry of this unit strongly resembles the granite of the Mt. Evans batholith (exposed 100 km south of the map area) intruded at 1,442±2 Ma (U-Pb on zircon; Aleinikoff and others, 1993) Lithology: granite.
1:100,000 sheet: Workman and others, 2018, U.S. Geological Survey Scientific Investigations Map 3399 (1 crag). A contact line at that scale is about 100 m wide on the ground.
Tan, coarse-grained to very coarse grained porphyritic granite composed of quartz, microcline, oligoclase, and biotite. Contains flow-aligned phenocrysts of microcline 2-8 cm long, and scattered, small, partially assimilated inclusions of biotite schist that contain large porphyroblasts of microcline. The Granite of Hagues Peak is crosscut by the Silver Plume Granite (Ysp), and yields a whole-rock Rb- Sr isochron age of 1,480 Ma (C.E. Hedge, written commun., 1977). GRI Source Map ID 141 (I-1973). Lithology: intrusive igneous (plutonic).
1:100,000 sheet: National Park Service Geologic Resources Evaluation program, 2006, National Park Service (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.