Mafic rocks of 1700-m.y. age group
Paleoproterozoic, about 2,500 to 1,600 million years old. 2 crags on this site have their map point on it.
What the map says
Gabbro and mafic diorite and monzonite Lithology: gabbro, diorite, minor monzonite.
1:500,000 sheet: Horton and others, 2017, U.S. Geological Survey Data Series 1052 (2 crags). A contact line at that scale is about 500 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.