Usage:
Pleasanton Group (CO,KS*,MO,NE,OK)
Pleasanton Formation (IA,KS*,MO*)
Subunits:
GROUP STATUS (Heckel and Watney, 2002, in KS; MO Geol. Survey, 2004; alphabetical): Hepler Formation, Shale Hill Formation.
GROUP STATUS (Jewett and others, 1965, in KS; alphabetical): Checkerboard Limestone, Seminole Formation, Tacket Formation.
FORMATION STATUS: includes Exline Limestone Member and Ovid coal bed in IA.
Geologic age:
Late Pennsylvanian (Missourian)*
Type section, locality, area and/or origin of name:
Named from exposures at Pleasanton, Linn Co., KS, where the schoolhouse hill is composed principally of these shales (Haworth, 1895, p. 44; see also MO Geol. Survey lexicon, Thompson, 2001).
AAPG geologic province:
Cherokee basin*
Forest City basin
Iowa shelf
Lincoln anticline
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 ([ ]).