Usage:
Ralston Creek Formation (CO*)
Geologic age:
Late Jurassic*
Type section, locality, area and/or origin of name:
Type section: at the locality described by LeRoy (1946, p. 51), on south side of Ralston Creek in NW/4 SW/4 sec. 5, T. 3 S., R. 70 W., Ralston Buttes quadrangle (Van Horn, 1957a).
[LeRoy, 1946, p. 51 gives type section of shale-marlstone facies of Ralston formation as sec. 5, T. 3 S., R. 70 W., Blackhawk quadrangle.]
AAPG geologic province:
Denver basin*
Las Vegas-Raton 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 ([ ]).