Usage:
No current usage.
(†Horsehead Tongue of Mancos Shale (NM) replaced with Atarque Member of Mesaverde Formation. See Atarque.)
Geologic age:
Late Cretaceous
Type section, locality, area and/or origin of name:
Named from typical exposures on east side of valley of Horsehead Creek, in T. 9 and 10 N., R. 17 W., Zuni Indian Reservation, McKinley Co., northwestern NM (Pike, 1947).
AAPG geologic province:
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 ([ ]).