Usage:
Sheep Crossing Formation (AZ)
Subunits:
(alphabetical) --all in AZ: Campground Member, Marshall Butte Member.
Geologic age:
Tertiary
Miocene
Miocene, middle to Miocene, late
Type section, locality, area and/or origin of name:
Type section: railroad cut about 200 m east of Sheep Crossing, in NW/4 SE/4 NW/4 sec. 33, T. 7 N., R. 27 E., southern Apache Co., AZ. Named from locality where AZ Highway 273 crosses West Fork of Little Colorado River, in S/2 NW/4 sec. 33, T. 7 N., R. 27 E., southern Apache Co., AZ (Merrill and Pewe, 1971).
[Composite of type sections of Campground and Marshall Butte Members of Sheep Crossing Formation (Merrill and Pewe, 1977)].
AAPG geologic province:
Black Mesa basin
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 ([ ]).