T tabulae: 51 Tabulata: 51 tape, masking: 19 tapirs: 104 tar: 5 Tarleton State College: 27 Tarrant County: 11 taxonomy: 21-22 teeth, horse: 104 mammoth: 104 shark: 10, 87, 88 _Tellina_: 73 Tertiary— derivation and pronunciation: 34 fossils: 43 corals: 53 gastropods: 59, 63, 64 mammals: 100-107, 103, 105 microfossils: 32 pelecypods: 72, 73, 74 radiolarians: 49 rocks of Gulf Coastal Plain, High Plains, North-Central Plains, and Trans-Pecos region: 42 Tetracoralla: 51 Tetrapoda: 86, 89-107 _texana, Exogyra_: 70 _Texanites_: 77 Texas A. & M. College: 1, 27 Texas Christian University: 27 Texas College: 27 Texas College of Arts and Industries: 27 Texas Highway Department: 17 Texas Memorial Museum: 14, 87, 95, 97, 100, 102 Texas Technological College: 27 Texas, the geology of: 34, 37-43 Texas Western College: 27 Thallophyta: 43, 46 Theophrastus: 3 Therapsids: 89 Theria: 100 therians: 100-107 artiodactyls: 101, 106 carnivores: 102, 103 dinocerates: 102, 105 edentates: 100, 101, 102 pantodonts: 102 perissodactyls: 104 proboscideans: 102, 104, 107 Theropoda: 97 theropods: 90, 97, 98 The University of Texas: 1, 2, 27 time, geologic: 34 titanotheres: 104, 105, 106 toads: 89 tortoises: 89 traces of organisms: 14 burrows: 14 coprolites: 14 gastroliths: 14 tracks: 14, 15 trails: 14 Tracheophyta: 44, 46, 48 _Trachodon_: 90, 97, 99 tracks, dinosaur: 14, 15, 97 Trans-Pecos region: 35, 36, 40, 42, 43, 86, 95, 102, 106 tree sloths: 100, 102 trees, coniferous: 7 _Trepospira_: 61 Triassic— derivation and pronunciation: 34 fossils: 42 dinosaurs: 95 phytosaurs: 91, 94, 95 of Crockett, Glasscock, Pecos, Reagan, and Upton counties; Glass Mountains and High Plains: 42 _Triceratops_: 90, 99, 100 _Trigonia_: 69 Trilobita: 78 trilobites: 78, 80 morphology: 80 Trilobitomorpha: 78 _Trinacromerum_: 91 Trinity University: 27 trivial name: 21-22 _Trochosmilia_: 53 _Tuba_: 64 _tuberculatus, Aulosteges_: 12, 13 _Turrilites_: 77 _worthensis_: 22 _Turritella_: 62, 63 turtles: 89, 91 tusk-shells: 56 Tyler Junior College: 27 _Tylosaurus_: 91, 93 _Tylostoma_: 62 _Tyrannosaurus_: 90, 97 U uintatheres: 102, 105 _Uintatherium_: 102, 105 umbilicus: 59, 60 United States Geological Survey: 19 United States National Museum: 2, 12 University of Corpus Christi: 27 University of Houston: 1, 27 University of Texas, The: 1, 2, 27 Upper Cretaceous: 34, 42, 78. _See also_ Gulf. Upton County: 42