Usage:
Percha Shale (AZ,NM*,TX*)
Percha Formation (NM*)
Subunits:
(alphabetical) --all in NM*: Box Member, Ready Pay Member.
Geologic age:
late Late Devonian (Famennian)*
Type section, locality, area and/or origin of name:
Type section: at "The Box," 2.5 mi southeast of Hillsboro, in SW/4 SW/4 SE/4 sec. 14, T. 16 S., R. 7 W., Sierra Co., NM (Stevenson, 1945).
AAPG geologic province:
Orogrande basin*
Basin-and-Range province*
Pedregosa 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 ([ ]).