Usage:
No current usage.
(†Patterson Ranch Group (OK) considered abandoned. See Fernvale, Sylvan, and Viola.)
Geologic age:
Late Ordovician
Type section, locality, area and/or origin of name:
Named from Patterson Ranch on the south edge of the Arbuckle Mountains on the east side of U.S. Highway 77. On this ranch the Viola, Fernvale. and Sylvan Formations are characteristically developed and they extend from the highway, [approx. E/2 E/2 sec. 25, T. 2 S., R. 1 E., northeastern corner Springer 7.5-min quadrangle, Carter Co.], southern OK (Decker, 1942).
AAPG geologic province:
South Oklahoma folded belt
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 ([ ]).