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National Geologic Map Database

Geologic Unit: Sullivan

Usage:

Sullivan Siltstone Member of Bonneterre Formation (MO*)


Geologic age:

latest Middle to earliest Late Cambrian (early Croixan; latest Lincolnian to earliest Millardan; latest Marjuman to earliest Steptoean)*


Type section, locality, area and/or origin of name:

Type section (surface): Crooked Creek cryptoexplosive structure, in center E/2 NW/4 sec. 17, T. 36 N., R. 4 W., Crawford Co., MO, in the Ozark uplift (this is the only surface exposure of this unit). Named from town of Sullivan, Franklin Co., MO, which is located 38 mi north of type section, just north of the Franklin-Crawford Co. line (Kurtz and others, 1975).
Reference section (subsurface): depth-interval 1,495.0 to 1,533.0 ft, St. Joe Minerals Corp. No. 64W63 (WR-1) core, in SE/4 SE/4 sec. 16, T. 29 N., R. 13 W., Wright Co., MO (Kurtz and others, 1975; Thompson and others, 2013).


AAPG geologic province:

Ozark uplift*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).