Usage:
Gothic shale (informal, unranked) in Ismay production interval (informal) of Paradox Member of Hermosa Formation (CO,UT)
Gothic black shale (informal, unranked) in Ismay production interval (informal) of Paradox Member of Hermosa Formation (CO,UT)
Informal and unranked. The lithologic term should not be capitalized.
Geologic age:
Middle Pennsylvanian (Desmoinesian)
Type section, locality, area and/or origin of name:
Unknown. Is an informal name in use by the petroleum industry.
AAPG geologic province:
Paradox 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 ([ ]).