Outer cap rock monzogranite of the Virginia Dale ring-dike complex
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
Pinkish-gray, medium-grained, porphyritic biotite monzogranite, similar in all respects to inner cap rock monzogranite (YgVi) except that phenocrysts are smaller and better aligned, and biotite-rich streaks are more common; color index generally 7 to 9. Contact with inner cap rock monzogranite is gradational Lithology: monzogranite.
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.
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.