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National Geologic Map Database

Geologic Unit: Strawn

Usage:

Strawn Group (TX*)
Strawn Formation (NM,TX)


Subunits:

GROUP STATUS (alphabetical) --all in TX: [?]Brannon Bridge Limestone, [?]Brazos River Formation, Buck Creek Sandstone, [?]Capps Limestone, Colony School Conglomerate, Dobbs Valley Sandstone Member, Dog Bend Limestone, East Mountain Shale, [†?]Fambro Sandstone, Garner Formation*, [?]Goen Limestone, Grindstone Creek Formation, [?]Hog Mountain Sandstone, Keechi Creek Shale, Keen Conglomerate, Lake Pinto Sandstone, Lazy Bend Formation, Lone Camp Formation, Meek Bend Limestone, Millsap Lake Formation*, Mineral Wells Formation*, Mingus Formation, Oran Sandstone, Palo Pinto Formation, Ricker Sandstone, Ricker Station Limestone, Santo Limestone, Village Bend Limestone, Wiles Limestone, Wynn Limestone.
FORMATION STATUS (alphabetical) --all in TX: Bond sand (informal), Spring Creek Bed.


Geologic age:

Middle Pennsylvanian*


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

Named from town of Strawn in Palo Pinto Co., TX, where well exposed (Cummins, 1891).


AAPG geologic province:

Bend arch*
Fort Worth syncline
Llano uplift
Permian basin
Strawn basin


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 ([ ]).