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National Geologic Map Database

Geologic Unit: Dennis Bridge

Usage:

Dennis Bridge Limestone Bed of Hill Creek Member of Lazy Bend Formation of Strawn Group (TX)
Dennis Bridge Limestone Member of Lazy Bend Formation of Strawn Group (TX)
Dennis Bridge Limestone Member of Millsap Lake Formation (TX)
Dennis Bridge Limestone Member of Rayville Formation of Kickapoo Creek Group (TX)


Geologic age:

Middle Pennsylvanian


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

Type locality: outcrops at end of bridge over Brazos River at Dennis in southwestern part of Parker County, north-central Texas. Exposure extends westward along the Brazos for 0.25 mi to valley of tributary; basal 3 feet is exposed in small outcrop in stream bank 0.5 mi east of south end of bridge at Dennis; these are the only surface occurrences of the limestone (Plummer and Hornberger, 1936; 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 ([ ]).