Usage:
Seventy-Six Shale Member of Bainbridge Formation (MO*,IL*)
Seventy Six Shale of Bainbridge Group (MO,IL)
Geologic age:
Silurian (Llandovery to Ludlow)*
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 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 ([ ]).