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National Geologic Map Database

Geologic Unit: Bluff Creek

Usage:

Bluff Creek Shale [unranked] in Cisco Group (TX)
Bluff Creek Shale Member of Graham Formation of Cisco Group (TX*)


Geologic age:

Late Pennsylvanian (Virgilian)*


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

Named from Bluff Creek, McCulloch Co., Colorado River region, central TX (US geologic names lexicons, USGS Bull. 896, 1200).


AAPG geologic province:

Bend arch*
Llano uplift*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).