Usage:
Ismay Substage of Four Corners Stage (AZ,CO,NM,UT)
Ismay production interval (informal) of Paradox Member of Hermosa Formation (CO,UT)
Ismay zone (informal)
For informal usage, the rank or lithologic term should not be capitalized.
Subunits:
informal Gothic shale (CO,UT).
Geologic age:
Middle Pennsylvanian (Desmoinesian)
Type section, locality, area and/or origin of name:
["Type section"] (subsurface): depth-interval from approx. 5,700 to 6,950 ft, Shell No. 1 Hovenweep well, in sec. 5, T. 40 S., R. 26 E., San Juan Co., UT (Baars and others, 1967).
AAPG geologic province:
Paradox basin
Black Mesa basin
San Juan 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 ([ ]).