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National Geologic Map Database

Geologic Unit: Brannon Bridge

Usage:

Brannon Bridge Limestone Member of Grindstone Creek Formation of Strawn Group (TX)
Brannon Bridge Limestone Member of Millsap Lake Formation (TX)
Brannon Bridge Limestone Member of Lazy Bend Formation (TX)
[?] Brannon Bridge Limestone of Strawn Group (TX)


Geologic age:

Middle Pennsylvanian


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

Notable exposures in vicinity of Brannon Bridge on the Brazos [River], about 6 mi south-southwest of Millsap, Parker Co., central TX (Plummer and Hornberger, 1936).
Type section: succession of beds exposed in Steussy Scarp, a prominent feature northwest of Rocky Creek west of Brazos River. Named from former highway bridge on Brazos River at a point 0.75 mi south of present Highway 80 bridge, Parker Co., [TX]. Outcrop of member extends south of U.S. Highway 80 along west side of meander of Brazos River forming Meek Bend; on west side of Brazos River outcrops are in bluffs along west and south sides of Meek Bend; southeast edge of outcrop forms Steussy Scarp which begins near river and extends southwestward across county line (Hendricks, 1957).


AAPG geologic province:

Fort Worth syncline


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 ([ ]).