Usage:
Escabrosa Group (AZ*,NM*)
Escabrosa Limestone (AZ*,NM*)
Subunits:
GROUP STATUS (alphabetical) --all in AZ*,NM*: Hachita Formation, Keating Formation.
FORMATION STATUS (alphabetical) --all in NM*: Hachita Member, Keating Member.
Geologic age:
Early to Middle Mississippian (Tournaisian to Visean; Osagean to Meramecian)*
Type section, locality, area and/or origin of name:
Not designated. Named from Escabrosa Ridge, Mule Mountains, Cochise Co., AZ (Ransome, 1904).
Type section stated to be "just west of Black Gap" (Hayes and Landis, 1965).
Principal reference section: near west edge of Mule Mountains, in NW/4 NE/4 sec. 9 and SW/4 SE/4 sec. 4, T. 23 S., R. 23 E., AZ (Hayes and Landis, 1965).
AAPG geologic province:
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 ([ ]).