Usage:
Horse Mesa Member of Wanakah Formation of San Rafael Group (AZ*,NM*,UT*)
Geologic age:
Jurassic, Middle*
Type section, locality, area and/or origin of name:
Type section: Horse Mesa, which extends from sec. 17, T. 38 N., R. 31 E., Apache Co., AZ, to secs. 26 and 27, T. 29 N., R. 21 W., San Juan Co., NM (Condon and Huffman, 1988).
AAPG geologic province:
San Juan basin*
Black Mesa basin*
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 ([ ]).