Usage:
Dillsboro Formation (IN*)
Dillsboro Formation of Maquoketa Group (IN)
Geologic age:
Ordovician, Late*
Cincinnatian*
Maysvillian*
Richmondian, early*
Type section, locality, area and/or origin of name:
Type area: southwestern Dearborn Co. and east-central Ripley Co., in vicinity of Dillsboro, Dearborn Co., IN (Brown and Lineback, 1966).
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 ([ ]).