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 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 ([ ]).