No current usage.
(Rocks of †Tanners Creek Formation (IN) reallocated to upper part of Dillsboro Formation. See Dillsboro.)
Late Ordovician
Type section: exposed in 7 railroad cuts on the New York Central RR along west fork of Tanners Creek between Harmons Station and Guilford, Dearborn Co., southeastern IN (Fox, 1962).
Cincinnati arch
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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 ([ ]).