Usage:
Middle Run Formation (OH,IN,KY)
Geologic age:
Precambrian, late(?)
Proterozoic(?)
Keweenawan(?)
Type section, locality, area and/or origin of name:
Type section: Basal 1910 ft of OH Division Geological Survey (DGS) well 2627, American Aggregates Corp. quarry, approximately 1 mi northeast of town of Lytle, NE/4 sec. 14, T. 3, R. 5, Wayne Twp., Warren Co., southwestern OH. Named from stream which heads near quarry (Shrake and others, 1990).
AAPG geologic province:
Cincinnati arch
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 ([ ]).