Usage:
/Richardson subgroup [informal] of Wabunsee Group (KS,MO)
(†Richardson subgroup not used by the NE Geol. Survey; type locality in NE.)
["Subgroup" not recognized as a formal stratigraphic rank term (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). Richardson subgroup considered informal and should not be capitalized.]
Subunits:
(alphabetical): Pillsbury Shale (KS,MO), Root Shale (KS), Stotler Limestone (KS) or Stotler Formation (MO), Wood Siding Formation (KS), Zeandale Limestone (KS) or Zeandale Formation (MO).
Geologic age:
Late Pennsylvanian (Virgilian)
Type section, locality, area and/or origin of name:
The Big Nemaha Valley of southern Richardson Co., southeastern NE, between points south of Humboldt and southwest of Falls City. Named from Richardson Co. (Condra, 1935).
AAPG geologic province:
Cherokee basin
Forest City basin
Nemaha 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 ([ ]).