Usage:
Gallup Sandstone (AZ*,NM*)
Gallup Sandstone of Mesaverde Group (AZ,CO,NM)
Subunits:
(alphabetical) --all in NM: Atarque Member, Tocito Member.
Geologic age:
Late Cretaceous (Turonian to Coniacian)*
Type section, locality, area and/or origin of name:
Named from town of Gallup (part of which is built upon its uppermost bed), [in T. 15 N., R. 18 W., McKinley Co.], northwestern NM (Sears, 1925).
Principal reference section: in SE/4 NE/4 sec. 13, T. 15 N., R. 18 W., McKinley Co., NM (Molenaar, 1983).
AAPG geologic province:
Orogrande 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 ([ ]).