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Qu Qbd PoMo Qu Pg2 AMARILLO JT Qbd Qu Pg2 Pg1 Qu Pl Pw Kl2 Ku1 Ku2 EPA DALLAS Ec1 EPA Ec2 Ej Qc Mof Pow Qb HOUSTON Ql Pow SAN ANTONIO AUSTIN Ku2 Ec1 EPA Qu Ku1 Ku1 Ku2 Ec1 Ec2 Mog Qb Ql Mof Oc Ej Mog Qu Mog Qb Qal Ku1 IPd lPm Kl1 IPv Qal Pg1 Qu Kl1 Kl2 Kl2 Qu Ku1 Pl Pw Kl1 Kl2 MIDLAND Qbd Kl2 JT PoMo Qu Ku pC Pau IPam IPd IPv EL PASO Po Pg2 Pg2 Pl Pw Qu pC pC IPam Pu MDO C OE Kl2 C GEOLOGY OF TEXAS 1992 BUREAU OF ECONOMIC GEOLOGY THE UNIVERSITY OF TEXAS AT AUSTIN University Station, Box X Austin, Texas 78713-8924 (512) 471-1534 G U L F O F M E X I C O CORPUS CHRISTI BROWNSVILLE LAREDO Ku C pC CENOZOIC MESOZOIC P ALEOZOIC Austin, Eagle Ford, Woodbine, and U. Washita Groups (Ku1) Alluvium (Qal) Quaternary undivided (Qu) Beaumont Formation (Qb) Lissie Formation (QI) Blackwater Draw Formation (Qbd) Willis Formation (Pow) Ogallala Formation (PoMo) Goliad Formation (Mog) Fleming and Oakville Formations (Mof) Catahoula Formation (Oc) Oligocene and Eocene undivided (OE) (volcanic rocks and conglomerates in Trans-Pecos Texas) Jackson Group (Whitsett, Manning, Wellborn, Caddell, Yazoo, and Moodys Branch Fms.) (Ej) Claiborne Group (Yegua Formation) (Ec2) Claiborne Group (Cook Mountain, Sparta, Weches, Queen City, and Reklaw Fms.) (Ec1) Wilcox and Midway Groups (EPA) Navarro and Taylor Groups (Ku2) Fredericksburg and L. Washita Groups (KI2) Trinity Group (KI1) Cretaceous undivided (Ku) Jurassic Triassic undivided (JT) Quaternary T ertiary 2 m.y. Pliocene 5 m.y. Miocene 24 m.y. Oligocene 38 m.y. Eocene 58 m.y. Paleocene Cre t aceous 144 m.y. Jurassic T riassic 245 m.y. Ochoan Series (Po) Guadalupian Series (Whitehorse and Quartermaster Formations) (Pg2) Guadalupian Series (Blaine and San Angelo Formations (Pg1) Leonardian Series (Pl) Wolfcampian Series (Pw) Permian undivided (Pu) Virgilian Series (IPv) Missourian Series (IPm) Desmoinesian Series (IPd) Mississippian, Devonian, and Ordovician undivided (MDO) Paleozoic undivided (Pau) Atokan and Morrowan Series (IPam) Cambrian ( C) Pre- cambrian 286 m.y. 320 m.y. 505 m.y. 570 m.y. 1200 m.y. 2000 m.y. Precambrian undivided (p C) 245 m.y. 66 m.y. 0 0 50 100 100 200 150 300 kilometers 200 miles TEXARKANA QAd8059
