- Usage in publication:
-
- Black Butte tongue
- Modifications:
-
- Original reference
- Dominant lithology:
-
- Shale
- AAPG geologic province:
-
- Green River basin
Summary:
Pg. 52-53, fig. 1. Black Butte tongue of Rock Springs formation of Mesaverde group. Sediments are characteristic of deposition in shallow-water near-shore environment. Shale is commonly sandy and contains much carbonaceous material. Thickness 860 feet. Overlies Chimney Rock tongue (new) [of Blair formation]. Underlies Ericson formation of Mesaverde group. Age is Late Cretaceous.
Named from exposures along Black Butte Creek, in sec. 36, T. 18 N., R. 102 W.,
Sweetwater Co., southwestern WY. Occupies strike valley between Chimney Rock
escarpment and cliffs of overlying Ericson formation.
Source: US geologic names lexicon (USGS Bull. 1200, p. 359).
- Usage in publication:
-
- Black Butte tongue
- Modifications:
-
- Revised
- AAPG geologic province:
-
- Green River basin
Summary:
Pg. 90 (fig. 1), 92, 93 (fig. 3). Black Butte tongue of Mancos shale. Lithologically similar to Blair formation, both being zones of lateral and vertical transition between typical marine and continental lithology. Equivalent to Rangely tongue (new) of Mancos. Figure 3 shows Black Butte tongue of Mancos. Age is Late Cretaceous.
Source: US geologic names lexicon (USGS Bull. 1200, p. 359).
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 ([ ]).