Usage:
French Creek Shale Member of Root Shale of Wabaunsee Group (KS*,NE*)
French Creek Shale Member of Root Formation of Wabaunsee Group (IA)
French Creek Shale Member of Root Shale of Vanoss Group (OK)
French Creek Shale Member of Root Shale of /Richardson subgroup [informal] of Wabaunsee Group (KS)
Originally called Frenck Shale.
["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.]
Geologic age:
Late Pennsylvanian (Virgilian)*
Type section, locality, area and/or origin of name:
Frenck [French] Creek, northeastern part of Pottawatomie Co., northeastern KS (Moore, 1932, 1936).
AAPG geologic province:
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 ([ ]).