Morrison, Canyon Springs Member Of Sundance And Jelm Formations
Mesozoic, about 222 to 150 million years old. 11 crags on this site have their map point on it.
The map groups these named formations into this unit: Morrison Formation, Canyon Springs Member, Jelm Formation.
What the map says
Morrison Formation (Upper Jurassic)?Upper part of unit is brown sandy marly shale underlain by red and gray shale with beds of silty limestone. Lower part is fine- to medium-grained sandstone 3-4.5 m thick underlain by dark greenish-gray impure limesto
1:100,000 sheet: Colton, Roger B., 1976, U.S. Geological Survey Geologic Investigations Series I-855-G (11 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
- Duncan's Ridge40 routes and 9 boulder problems · Horsetooth Reservoir · 5,719 ft · sandstone (Dakota Sandstone) (another source)
- Kahuna Boulder10 boulder problems · Carter Lake · 5,757 ft
- Chain Rock7 boulder problems · Carter Lake · 5,917 ft
- Big Block6 boulder problems · Carter Lake · 5,908 ft
- Little Boulder1 route and 5 boulder problems · Carter Lake · 5,914 ft
- Little Debbie's Boulder6 boulder problems · Carter Lake · 5,803 ft
- Book Boulder4 boulder problems · Carter Lake · 5,873 ft
- The Bridge aka Cave Rock3 boulder problems · Carter Lake · 5,884 ft
- Entrance Overhang3 boulder problems · Carter Lake · 5,836 ft
- Scenic Rock3 boulder problems · Carter Lake · 5,860 ft
- Doughboy Boulder2 boulder problems · Carter Lake · 5,761 ft