Quartz-feldspar gneiss
Gneiss, schist & quartzite. Paleoproterozoic, about 2,500 to 1,600 million years old. 37 crags on this site have their map point on it.
What the map says
Gray, dark-gray, white, pinkish-gray, and tan, moderately foliated to well-foliated, layered, fine- to coarse-grained (mostly medium grained) quartz-plagioclase-microcline-biotite gneiss. Proportion of minerals varies widely. Layers typically 10 cm to several tens of meters thick and commonly wavy. Locally contains layers of foliated monzogranite and granodiorite. May contain minor, thin layers of hornblende gneiss and amphibolite. Commonly migmatitic. U-Pb date on weakly foliated rock of monzogranitic composition in northwestern part of Indian Hills 7.5-minute quadrangle is 1,776±4 Ma. Weathers tan to pinkish tan in rounded outcrops. Crops out widely throughout map area
1:100,000 sheet: Kellogg and others, 2008, USGS Geologic Investigations Series 3000 (37 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.
Golden
- Primo Wall38 routes · Clear Creek Canyon · 7,097 ft · gneiss and schist (another source)
- East Colfax27 routes · Clear Creek Canyon · 7,091 ft · gneiss and schist (another source)
- The Fiscal Cliff19 routes · Clear Creek Canyon · 6,938 ft · gneiss and schist (another source)
- The Bunker13 routes · Clear Creek Canyon · 7,777 ft · gneiss and schist (another source)
- The Armory12 routes · Clear Creek Canyon · 7,078 ft · gneiss and schist (another source)
- Nomad's Cave12 routes · Clear Creek Canyon · 7,090 ft · gneiss and schist (another source)
- A Little Piece of South Dakota10 routes · Clear Creek Canyon · 6,769 ft · gneiss and schist (another source)
- Play Pen10 routes · Clear Creek Canyon · 7,035 ft · gneiss and schist (another source)
- Convenience Cliff9 routes · Clear Creek Canyon · 7,323 ft · gneiss and schist (another source)
- The Conspiracy Crag8 routes · Clear Creek Canyon · 7,423 ft · gneiss and schist (another source)
- The Crystal Tower7 routes · Clear Creek Canyon · 7,091 ft · gneiss and schist (another source)
- Mourning Glory7 routes · Clear Creek Canyon · 7,269 ft · gneiss and schist (another source)
- Breakfast Cliff6 routes · Clear Creek Canyon · 7,172 ft · gneiss and schist (another source)
- Main Cliff6 routes · Ralston Buttes · 7,381 ft
- The Aqueduct5 routes · Clear Creek Canyon · 8,144 ft · gneiss and schist (another source)
- Broverhang5 routes · Clear Creek Canyon · 7,120 ft · gneiss and schist (another source)
- The Healing Center5 routes · Clear Creek Canyon · 7,338 ft · gneiss and schist (another source)
- Broken Angel3 routes · Clear Creek Canyon · 7,081 ft · gneiss and schist (another source)
- The Nest3 routes · Clear Creek Canyon · 7,299 ft · gneiss and schist (another source)
- The Guppy2 routes · Clear Creek Canyon · 7,150 ft · gneiss and schist (another source)
Dumont vicinity
- Mill Creek Crag27 routes · 8,874 ft
- Mill Creek Dome14 routes · 9,380 ft
- Mill Creek Block5 routes and 2 boulder problems · 8,937 ft
- Lisa Randall Wall5 routes · 9,026 ft
- Trundle Wall3 routes · 7,911 ft
- ? Fall River Rd/I-70 slab aka Stanley Slab or Stanley Road or Frontage River Road2 routes · 7,882 ft
- The Correction Crag2 routes · Correction Crag, The · 8,866 ft
- Saint Mary's Glacier1 route · 9,050 ft
Morrison/Evergreen/Littleton
- Lover's Leap15 routes · 7,048 ft
- Deer Creek Crag6 routes and 6 boulder problems · 6,416 ft
- Fireblack Boulder12 boulder problems · 6,731 ft
- Pyramid Boulder3 boulder problems · 7,054 ft
- What's With all These Tiny Trees? (WWATTT)3 boulder problems · 6,506 ft
- Corwina Park Boulders2 boulder problems · 6,759 ft