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National Geologic Map Database

Geologic Unit: Nicholas

Usage:

Nicholas Bed of Tanglewood Limestone Member of Lexington Limestone (KY*)
Nicholas Bed of Tanglewood Member of Lexington Limestone (KY*)


Geologic age:

Middle to Late(?) Ordovician (Shermanian to Edenian?)*


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

Type area: Nicholas Co., KY; typically exposed between Pleasant Valley and Millersburg, KY. Named from Nicholas Co., KY, where it is fully developed southwest of Pleasant Valley (Foerste, 1909). [From GNU records (USGS DDS-6; Reston GNULEX) and US geologic names lexicon (USGS Bull. 896)].


AAPG geologic province:

Cincinnati arch*


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 ([ ]).