Usage:
Cotter Dolomite (AR*,IL*,MO*,OK*)
Cotter Dolomite of Arbuckle Group (OK*?, and KS*-subsurface)
Cotter Dolomite and Jefferson City Dolomite, undifferentiated (AR, and KS-subsurface)
Cotter Formation and Jefferson City Formation, undifferentiated (AR)
Geologic age:
Early Ordovician (Ibexian; Tulean; Cassinian)*
Type section, locality, area and/or origin of name:
Type section: starting at valley bottom just upstream from west end of White River bridge at Cotter and extending to top of hill westward along U.S. Highway 62, in sec. 31, T. 19 N., R. 14 W., Cotter 7.5-min quadrangle, Baxter Co., northern AR (Purdue and Miser, 1916; name credited to E.O. Ulrich, unpub. data).
Reference sections: roadcuts on U.S. Highway 65 south of Springfield in Christian and Taney Cos., southwestern MO (Thompson, 1991).
AAPG geologic province:
Anadarko basin*
Appalachian basin
Arkoma basin*
Central Kansas uplift*
Chautauqua platform*
Cherokee basin*
Forest City basin*
Illinois basin*
Nemaha anticline*
Ozark uplift*
Salina basin*
Upper Mississippi embayment*
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 ([ ]).