Usage:
Four Corners Stage (AZ,CO,NM,UT)
Subunits:
(alphabetical): Barker Creek substage, Akah substage, Desert Creek substage, Ismay substage.
Geologic age:
Middle Pennsylvanian (Desmoinesian)
Type section, locality, area and/or origin of name:
["Type section"] (subsurface): defined in Shell No. 1 Hovenweep well, in sec. 5, T. 40 S., R. 26 E., San Juan Co., UT. Origin of name not stated by authors, but probably named from Four Corners area of UT, CO, NM, and AZ (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 ([ ]).