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National Geologic Map Database

NGMDB

Geologic Unit: Francis

Usage:

Francis Formation (OK*-recognized locally in Pontotoc and Seminole Cos.)


Subunits:

DeNay Limestone Member (OK*).


Geologic age:

Late Pennsylvanian (Missourian)*


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

Town of Francis, which is situated on eastern edge of outcrop, northeastern Pontotoc Co., central southern OK, and "all that portion of the outcrop which extends for a distance of 3 mi north, and for a similar distance south of Canadian River," Stonewall quadrangle, Pontotoc Co., OK. Named from town of Francis (Morgan, 1924; see also Tanner, 1956).


AAPG geologic province:

Arkoma basin*
Chautauqua platform*


NGMDB

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 ([ ]).

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Page Last Modified: Tue Jun 3 17:09:12 2014