Quartzofeldspathic mica schist
Gneiss, schist & quartzite. Paleoproterozoic, about 2,500 to 1,600 million years old. 7 crags on this site have their map point on it.
What the map says
Mica-poor schist interbedded with quartzofeldspathic metasandstone; typically shows identifiable sillimanite, and garnet is locally prominent. Unit contains interbedded knotted mica schist (Xbk) and sparse, thin beds of granule-sized metaconglomerate Lithology: schist.
1:100,000 sheet: Workman and others, 2018, U.S. Geological Survey Scientific Investigations Map 3399 (7 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.
Fort Collins
- Pine Vu4 routes and 21 boulder problems · Poudre Canyon · 5,760 ft · granite and gneiss (another source)
- Happy Hour Crag10 routes · Poudre Canyon · 5,696 ft · granite and gneiss (another source)
- Stove Prairie Road Areas8 routes · Poudre Canyon · 6,615 ft · granite and gneiss (another source)
- Poudre Practice Rock4 routes and 1 boulder problem · Poudre Canyon · 5,459 ft · granite and gneiss (another source)
- Brink's Rock Area3 routes · Poudre Canyon · 5,862 ft · granite and gneiss (another source)
- Brink's Rock1 route · Poudre Canyon · 5,851 ft · granite and gneiss (another source)
- Mile Marker 1181 boulder problem · Poudre Canyon · 5,537 ft · granite and gneiss (another source)