Amphibolite and quartzite
Gneiss, schist & quartzite. Paleoproterozoic, about 2,500 to 1,600 million years old. 1 crag on this site has its map point on it.
What the map says
Gray to dark-gray, interlayered amphibolite, hornblende gneiss, biotite-hornblende-plagioclase gneiss, and subordinate calc-silicate gneiss and quartzite. Mapped only in Indian Hills 7.5-minute quadrangle (Bryant and others, 1973), where it forms a structurally overlying carapace to two antiformal bodies of quartz-feldspar gneiss (Xf). One U-Pb zircon age on a quartz-rich layer in a hornblende-gneiss sequence from near Phillipsburg is 1,773±4 Ma (W.R. Premo, unpub. data, 2006), which is minimum age of deposition of the quartz-rich protolith
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.