Period	age	Group	Formation
Eocene	Eocene	Claib	Stone City
Cretaceous	Maastrichtian	Navarro	Nacatoch
Cretaceous	Campanian	Taylor	Ozan
Cretaceous	Campanian	Tornillo	Aguja
Cretaceous	Santonian Coniacian	Austin	Austin Chalk
Cretaceous	Santonian Coniacian	Terl	Pen
Cretaceous	Coniacian		Eagle Ford/Atco
Cretaceous	Turonian Coniacian	Terl	Boquillas
Cretaceous	Cenomanian Turonian		Eagle Ford
Cretaceous	Cenomanian	Washita	Buda
Cretaceous	Cenomanian	Washita	Del Rio
Cretaceous	Cenomanian	Washita	Georgetown
Cretaceous	Albian	Washita	Santa Elena
Cretaceous	Albian	Fred	Devils River
Cretaceous	Albian	Fred	Edwards Limestone
Cretaceous	Albian	Fred	Comanche Peak
Cretaceous	Albian	Fred	Walnut
Cretaceous	Albian	Trinity	Glen Rose
Cretaceous	Albian	Trinity	Hensell Sand
Cretaceous	Albian	Trinity	Lithosome
Jurrasic			Navajo
Triassic		Dockum	Dockum
Permian	Ochoan		Quartermaster
Permian	Roadian Wordian	P River	Blaine
Permian	Artinskian	Witchita	Bead Mountain
Permian	Asselian	Cisco	Moran
Pennsylvanian	Virgilian	Cisco	Harpersville
Pennsylvanian	Virgilian	Cisco	GrahamThrifty
Pennsylvanian	Virgilian	Cisco	Jacksboro Limestone
Pennsylvanian	Virgilian	Cisco	Finnis Shale
Pennsylvanian	Missourian	Canyon	Palo Pinto
Pennsylvanian	Missourian	Strawn	Keechi Creek Shale
Pennsylvanian	Missourian	Strawn	Mineral Wells
Pennsylvanian			Fountain
Pennsylvanian	Morrowan	Bend	Marble Falls
Pennsylvanian		Bend	Smithwick Shale
Mississipian			Deseret Limestone
Devonian			Caballos Novaculite
Ordivician	461	Simpson	Bromide
Ordivician		Ellen	Ellenburger Group
Cambrian	Paibian	MHollow	Wilberns
Cambrian	Paibian	MHollow	Riley
Cambrian	Wuliuan		Wheeler Shale
Cambrian			Ophir
Cambrian			Tintic Quartzite
			Aeolian
			Alluvial
			Other
Quaternary

References:

USGS Texas Formation List

Formations:

References: