Usage:
No current usage.
(Rocks of †Columbiana Formation (AL) reallocated to Athens Shale. See Athens.)
Geologic age:
Late Ordovician (late Whiterockian to Mohawkian; late Chazyan to Turinian)
Type section, locality, area and/or origin of name:
Type section: just west of Simpson Springs, 2.5 mi northwest of Calera, [Montevalo 15-min quadrangle, 1944 ed.], Shelby Co., AL. Named from Columbiana 15-min quadrangle in which east side of Calera is located (Cooper, 1956).
AAPG geologic province:
Appalachian basin
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 ([ ]).