Usage:
Chemehuevi Formation (AZ*,CA*,NV*)
Geologic age:
Quaternary (late Pleistocene)*
Type section, locality, area and/or origin of name:
Type section: exposed at Loaf Rock hill near the Katherine Ranger Station in Lake Mead National Recreation Area, adjacent to Lake Mohave, in NW/4 sec. 7, T. 21 N., R. 21 W., [Lat. 35 deg. 13 min. 26 sec. N., Long. 114 deg. 33 min. 59 sec. W.], Davis Dam 7.5-min quadrangle, [Mohave Co.], western AZ (Malmon and others, 2011).
Reference sections: (1) Katherine Landing, about 0.5 km southwest of type section, in NW/4 sec. 7, T. 21 N., R. 21 W., [approx. Lat. 35 deg. 13 min. 12 sec. N., Long. 114 deg. 34 min. 14 sec. W., Davis Dam 7.5-min quadrangle, Mohave Co., western AZ]; (2) old Calville outcrop as described by Longwell (1936, p. 1445-1446), [Sandy Cove area, north shore of Lake Mead, in NE/4 sec. 13, T. 21 S., R. 65 E., approx. Lat. 36 deg. 08 min. 15 sec. N., Long. 114 deg. 40 min. W., Callville Bay 7.5-min quadrangle (1983 prov. ed.), Clark Co., southeastern NV] (Malmon and others, 2011).
Named from Chemehuevis [Chemehuevi] Valley, south of The Needles, along the Colorado River, Mohave Co., AZ and San Bernardino Co., CA [about 10 mi south of type section] (Lee, 1908).
AAPG geologic province:
Basin-and-Range province*
Great Basin province*
Mojave basin*
Salton basin*
Plateau sedimentary 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 ([ ]).