- Usage in publication:
-
- Thirteenmile Creek Tongue*
- Modifications:
-
- Named
- Dominant lithology:
-
- Marlstone
- Sandstone
- AAPG geologic province:
-
- Piceance basin
Summary:
Named for Dry Thirteenmile Creek in the No Name Creek quad, Rio Blanco Co, CO as a tongue of Green River Formation. Type section measured on south side of creek in SW1/4 sec 26, SE1/4 sec 27, NW1/4 sec 34, T2S, R95W in the Piceance basin. Is a heterogeneous sequence composed mostly of marlstone, but has sandstone, limestone, and oil shale. Marlstone is light gray and variably silty. Sandstone is light brown, very fine grained, tuffaceous, and calcareous. A few tan siltstone beds present. The few limestone beds are porous, algal-ostracodal and have abundant gastropods at some localities. Is 137 ft thick at type--ranges from 60-200 ft in thickness. Overlies and underlies Uinta Formation. Is widespread in northern part of basin. Merges with main body of Green River in east part of basin. Called Barcus Creek marker bed in previous reports. Assigned an Eocene age.
Source: GNU records (USGS DDS-6; Denver GNULEX).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).