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National Geologic Map Database

Geologic Unit: Backbone

Usage:

Backbone Limestone (IL*)
Backbone Limestone of New Harmony Group (IL,IN,KY)


Geologic age:

Early Devonian*


Type section, locality, area and/or origin of name:

Notable exposures near southern end of Devil's Back-bone [Backbone] Ridge, a short distance north of Grand Tower, Jackson Co., southwestern IL (Savage, 1920).


AAPG geologic province:

Illinois basin*


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 ([ ]).