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National Geologic Map Database

Geologic Unit: Smithwick

Usage:

Smithwick Shale of Bend Group (TX*)
Smithwick Formation (TX)
Smithwick Group (TX)


Subunits:

GROUP STATUS (alphabetical) --all in TX subsurface: Caddo Pool Formation, Eastland Lake Formation, Parks Formation.


Geologic age:

Pennsylvanian, Middle*


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

Not synopsized to date.


AAPG geologic province:

Llano uplift*
Bend arch*


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 ([ ]).