Granite of Rosalie Peak
Granite. Mesoproterozoic, about 1,600 to 1,000 million years old. 1 crag on this site has its map point on it.
What the map says
Gray to light-pinkish-gray, coarse-grained, equigranular to porphyritic biotite syenogranite and monzogranite (Bryant and Hedge, 1978). Locally contains Carlsbad-twinned microcline phenocrysts as long as 4 cm and has weak foliation defined by aligned biotite. Two small plutons intrude the Mount Evans batholith near Rosalie Peak. May be relatively felsic phase of granodiorite of Mount Evans batholith (unit YgdM). U-Pb zircon date is 1,448±9 Ma (Aleinikoff and others, 1993a). Includes the granite of Sheep Mountain in southeastern Keystone quadrangle (Widmann and others, 2003), which Lovering (1935) included with the granite of Rosalie Peak
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.