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National Geologic Map Database

Geologic Unit: Thrifty

Usage:

Thrifty Formation of Cisco Group (TX*)
[?] Thrifty Group (TX)


Subunits:

GROUP STATUS (alphabetical) --all in TX: Avis Sandstone, Chaffin Formation, Crystal Falls Limestone, Obregon Formation, Speck Mountain Formation.
FORMATION STATUS (alphabetical) --all in TX: Avis Sandstone Member, Belknap Limestone Member*, Blach Ranch Limestone Member*, Breckenridge Limestone Member*, Chaffin Limestone Member*, Crystal Falls Limestone Member*, Ivan Limestone Member, Lohn Shale Member*, Parks Mountain Sandstone Member*, Speck Mountain Limestone Member*.


Geologic age:

Late Pennsylvanian (Virgilian)*


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

Not designated. Named from town of Thrifty in center of Brown Co., TX (Plummer and Moore, 1922).


AAPG geologic province:

Bend arch*
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 ([ ]).