Usage:
American Flag Formation (AZ*)
Geologic age:
Late Cretaceous (Campanian)*
Type section, locality, area and/or origin of name:
Type area: Nugget Canyon, south of Mogul Fault, SW/4 Mammoth 15-min quadrangle [in T. 10 S., R. 16 E.], Pinal Co., south-central AZ. Named from nearby American Flag Spring, a well-known landmark, in sec. 21, T. 10 S., R. 16 E., Mammoth quadrangle, Pinal Co., south-central AZ (Creasey, 1967).
AAPG geologic province:
Basin-and-Range province*
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 ([ ]).