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National Geologic Map Database

Geologic Unit: Seventy-Six

Usage:

Seventy-Six Shale Member of Bainbridge Formation (MO*,IL*)
Seventy Six Shale of Bainbridge Group (MO,IL)


Geologic age:

Silurian (Llandovery to Ludlow; Niagaran Provincial Age)*


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

Type section: roadcut on Perry Co. Farmmarket Road D, in SE/4 NE/4 SW/4 sec. 29, T. 25 N., R. 13 E., Altenburg, MO-IL, 7.5-min quadrangle, Perry Co., eastern MO. Named from village of Seventy-Six, located about 1 mi northeast of type section (Satterfield and Thompson, 1975).


AAPG geologic province:

Ozark uplift*
Illinois basin*
Upper Mississippi embayment*


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 ([ ]).