Usage:
Black Sulphur Tongue of Green River Formation (CO*)
Geologic age:
Tertiary*
Eocene*
Type section, locality, area and/or origin of name:
Type section: in NW/4 SW/4 SW/4 sec. 23, T. 2 S., R. 98 W., Rio Blanco Co., CO. Named from Black Sulphur Creek, Rock Shool quadrangle, Rio Blanco Co., CO (Duncan and others, 1974).
AAPG geologic province:
Piceance basin*
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 ([ ]).