Silver Plume Quartz Monzonite

What the map says

Pale yellowish- orange to pale reddish-gray, equigranular, fine- to medium-grained, biotite- muscovite quartz monzonite; some outcrops are gray to tan, medium- to coarse-grained porphyritic quartz monzonite that contains tabular microcline phenocrysts; c

1:100,000 sheet: Colton, Roger B., 1976, U.S. Geological Survey Geologic Investigations Series I-855-G (2 crags). A contact line at that scale is about 100 m wide on the ground.

Coarse-grained to fairly fine-grained muscovite-biotite quartz monzonite. Locally foliated. Age about 1.44 billion years (Hedge, 1969).

1:100,000 sheet: Trimble and others, 2003, U.S. Geological Survey Geologic Investigations Series I-856-H (15 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.