Granitic rocks of 1400- and 1700-m.y. age groups, undivided, or, in Taylor River region, rocks with characteristics of Xg but U-Th-Pb zircon ages of Yg
Granite. Mesoproterozoic, about 1,600 to 1,000 million years old. 3 crags on this site have their map point on it.
What the map says
The sheet gives no description for this unit. Lithology: granite.
1:500,000 sheet: Horton and others, 2017, U.S. Geological Survey Data Series 1052 (3 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.