Chinle Formation
Late Triassic, about 232 to 207 million years old. 6 crags on this site have their map point on it.
What the map says
Red and reddish-brown siltstone interbedded with lenses of red sandstone and shale, limestone-pebble and shale-pellet conglomerate; lenses of grit and quartz-pebble conglomerate near base. Thickness 80-120 feet. Lithology: clastic; siltstone; sandstone; shale.
1:100,000 sheet: Day and others, 1999, U.S. Geological Survey Open-File Report 99-0427 (6 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.
Grand Junction Area
- Liberty Cap16 routes · Colorado National Monument · 5,545 ft · sandstone (Wingate Sandstone) (another source)
- Independence Monument7 routes · Colorado National Monument · 5,564 ft · sandstone (Wingate Sandstone) (another source)
- Organ Pipe Spire and Pipe Organ Spire7 routes · Colorado National Monument · 5,558 ft · sandstone (Wingate Sandstone) (another source)
- Black Rock4 routes and 1 boulder problem · Westwater Area · 4,426 ft
- Sentinel Spire4 routes · Colorado National Monument · 5,298 ft · sandstone (Wingate Sandstone) (another source)
- [Redacted]1 route · Colorado National Monument · 5,814 ft · sandstone (Wingate Sandstone) (another source)