Usage:
Ballard Formation of Meade Group (KS*)
Subunits:
(alphabetical) --all in KS*: Angell Member, Missler Member.
Geologic age:
late Tertiary (Pliocene; Blancan NALMA)*
Due to change in Plio-Pleistocene boundary, age may now be considered all or in part Pleistocene.
Type section, locality, area and/or origin of name:
Type locality: on Big Springs Ranch, in secs. 7 and 18, T. 32 S., R. 28 W., Meade Co., southwestern KS. Named from Louise Ballard Ranch which is shown on Meade County Platt book as having included the present Big Springs Ranch (Hibbard, 1958).
AAPG geologic province:
Anadarko 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 ([ ]).