Usage:
Alger Formation (KY)
Alger Shale of Crab Orchard Group (KY*-local)
Subunits:
(alphabetical): Dayton Dolomite Member (KY*-local), Estill Shale Member (KY*-local), Laurel Member (OH), Lulbegrud Shale Member (KY*-local), Massie Member (OH), Waco Member (KY*-local).
Geologic age:
early Silurian (Llandovery)*
Type section, locality, area and/or origin of name:
Named from Alger Station on the Louisville and Atlantic RR, between Panola and Irvine, about 1 mi east of Estill-Madison Co. line, east-central KY (Foerste, 1906).
AAPG geologic province:
Appalachian basin*
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 ([ ]).