Crab Orchard Formation (KY*,OH)
Crab Orchard Shale (KY*)
Crab Orchard Group (KY*,OH*)
GROUP STATUS (alphabetical): Alger Shale (KY*-local), Drowning Creek Formation (KY*), Estill Shale (KY*,OH*), Noland Formation (KY,OH).
early Early Silurian (Llandovery)*
Vicinity of Crab Orchard village, Crab Orchard quadrangle, Lincoln Co., central KY (Linney, 1882).
Reference section (Crab Orchard Group): along U.S. Highway 150 just east of Cedar Creek, 2.5 mi west of Crab Orchard village, Crab Orchard quadrangle, Lincoln Co., central KY (McDowell, 1983).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.
"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).