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National Geologic Map Database

Geologic Unit: Little Brazos

Usage:

Little Brazos Limestone Lentil of Cook Mountain Formation of Claiborne Group (TX)


Geologic age:

early Tertiary (middle Eocene)


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

Best exposed along Little Brazos River in neighborhood of the old interurban crossing on W.T. James estate, 70 acres, W. Matthis survey, about 1.4 mi northeast of Bryan Junction [now Varisco], [approx. Lat. 30 deg. 39 min. 40 sec. N., Long. 96 deg. 30 min. 36 sec. W., Mumford 7.5-min quadrangle, Brazos Co.], eastern central TX (Renick and Stenzel, 1931).


AAPG geologic province:

East Texas basin
Gulf Coast 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 ([ ]).