Usage:
Speed Member of North Vernon Limestone (IN)
Speed Member of Sellersburg Limestone (IN*)
(†Sellersburg Limestone not used by the IN Geol. Survey. Replaced with North Vernon Limestone.)
Geologic age:
Middle Devonian*
Type section, locality, area and/or origin of name:
Exposure at Speeds quarry near Sellersburg (Clark Military Grants 131 and 132), Clark Co., IN (Sutton and Sutton, 1937).
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 ([ ]).