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Dockum - Tecovas, Texas, USA

GroupDockum
FormationTecovas
Age:228 - 209 Ma
Late/Upper Triassic
IntervalNorian
Lithologysiltstone/conglomerate, claystone, mudstone, siltstone, "siliciclastic"
Number of Collections17
Number of Occurrences124

Recorded Sample Locations

LocationRegionStratigraphic Name
NMMNH L-1312Crosby County, Texas, USADockum - Tecovas
Head of Holmes CreekCrosby County, Texas, USADockum - Tecovas
east bank of Blanco RiverCrosby County, Texas, USADockum - Tecovas
North of Cedar MountainCrosby County, Texas, USADockum - Tecovas
west bank of Blanco RiverCrosby County, Texas, USADockum - Tecovas
Sand Creek breaksCrosby County, Texas, USADockum - Tecovas
Rotten Hill/Herring Ranch Potter County, Texas, USADockum - Tecovas
Cerita de la Cruz CreekPotter County, Texas, USADockum - Tecovas
Lower Sunday Canyon locality Randall County, Texas, USADockum - Tecovas
Sierrita de la Cruz Creek breaksPotter County, Texas, USADockum - Tecovas
Walker's TankCrosby County, Texas, USADockum - Tecovas
TMM 31173Crosby County, Texas, USADockum - Tecovas
near Rotten HillOldham County, Texas, USADockum - Tecovas
L-7 ranchCrosby County, Texas, USADockum - Tecovas
5 km north of DockumDickens County, Texas, USADockum - Tecovas
Spur-Crosbyton RoadCrosby County, Texas, USADockum - Tecovas

Associated Units

Stratigraphic NameAgeLithologyOccurrence Records
Chinle - Tecovas228 - 209 Ma
Late/Upper Triassic
sandstone/conglomerate, conglomerate/mudstone83
Dockum237 - 201 Ma
Mesozoic
siliciclastic, mudstone6
Dockum - Trujillo237 - 209 Ma
Late/Upper Triassic
siltstone, conglomerate10

Recorded Fossils

Accepted NameHierarchyAge
Turseodus sp.
genus
6Animalia : Chordata : Actinopterygii : Palaeoniscidae : Turseodus228 - 208.5 Ma
Late/Upper Triassic
Lasalichthys sp.
genus
6Animalia : Chordata : Actinopteri : Palaeonisciformes : Redfieldiidae : Lasalichthys228 - 208.5 Ma
Late/Upper Triassic
Redfieldiidae
family
5Animalia : Chordata : Actinopteri : Palaeonisciformes : Redfieldiidae228 - 208.5 Ma
Late/Upper Triassic
Colobodontidae
family
5Animalia : Chordata : Actinopteri : Perleidiformes : Colobodontidae228 - 208.5 Ma
Late/Upper Triassic
Semionotidae
family
5Animalia : Chordata : Actinopteri : Semionotiformes : Semionotidae228 - 208.5 Ma
Late/Upper Triassic
Actinopterygii
class
3Animalia : Chordata : Actinopterygii228 - 208.5 Ma
Late/Upper Triassic
Chondrichthyes
class
3Animalia : Chordata : Chondrichthyes228 - 208.5 Ma
Late/Upper Triassic
Lonchidion humblei
species
7Animalia : Chordata : Chondrichthyes : Hybodontiformes : Lonchidiidae : Lonchidion : Lonchidion humblei228 - 208.5 Ma
Late/Upper Triassic
Polyacrodus sp.
genus
6Animalia : Chordata : Chondrichthyes : Hybodontiformes : Polyacrodontidae : Polyacrodus228 - 208.5 Ma
Late/Upper Triassic
Triodus moorei
species
7Animalia : Chordata : Chondrichthyes : Xenacanthiformes : Xenacanthidae : Triodus : Triodus moorei228 - 208.5 Ma
Late/Upper Triassic
Chinlea sorenseni
species
7Animalia : Chordata : Coelacanthimorpha : Coelacanthiformes : Mawsoniidae : Chinlea : Chinlea sorenseni228 - 208.5 Ma
Late/Upper Triassic
Coelacanthidae
family
5Animalia : Chordata : Sarcopterygii : Coelacanthiformes : Coelacanthidae228 - 208.5 Ma
Late/Upper Triassic
Ornithischia
unranked clade
99Animalia : Chordata : Ornithischia228 - 208.5 Ma
Late/Upper Triassic
Cynodontia
family
5Animalia : Chordata : Cynodontia228 - 208.5 Ma
Late/Upper Triassic
Rewaconodon tikiensis
species
7Animalia : Chordata : Osteichthyes : Cotylosauria : Dromatheriidae : Rewaconodon : Rewaconodon tikiensis228 - 208.5 Ma
Late/Upper Triassic
Colognathus obscurus
species
7Animalia : Chordata : Osteichthyes : Cotylosauria : Colognathus : Colognathus obscurus228 - 208.5 Ma
Late/Upper Triassic
Tritheledontidae
family
5Animalia : Chordata : Reptilia : Tritheledontidae228 - 208.5 Ma
Late/Upper Triassic
Arganodus dorotheae
species
7Animalia : Chordata : Osteichthyes : Arganodontidae : Arganodus : Arganodus dorotheae228 - 208.5 Ma
Late/Upper Triassic
Osteichthyes
unranked clade
99Animalia : Chordata : Osteichthyes228 - 208.5 Ma
Late/Upper Triassic
Tetrapoda
unranked clade
99Animalia : Chordata : Osteichthyes : Austrobrachyops : Tetrapoda228 - 208.5 Ma
Late/Upper Triassic
Apachesaurus gregorii
species
7Animalia : Chordata : Amphibia : Metoposauridae : Apachesaurus : Apachesaurus gregorii237 - 208.5 Ma
Late/Upper Triassic
Koskinonodon perfectus
species
7Animalia : Chordata : Osteichthyes : Temnospondyli : Metoposauridae : Koskinonodon : Koskinonodon perfectus237 - 208.5 Ma
Late/Upper Triassic
Metoposauridae
family
5Animalia : Chordata : Osteichthyes : Temnospondyli : Metoposauridae228 - 208.5 Ma
Late/Upper Triassic
Temnospondyli
unranked clade
99Animalia : Chordata : Osteichthyes : Temnospondyli228 - 208.5 Ma
Late/Upper Triassic
Reptilia
class
3Animalia : Chordata : Reptilia228 - 208.5 Ma
Late/Upper Triassic
Lepidosauria
superorder
3.7Animalia : Chordata : Reptilia : Eosuchia : Lepidosauria228 - 208.5 Ma
Late/Upper Triassic
Vancleavea campi
species
7Animalia : Chordata : Reptilia : Doswelliidae : Vancleavea : Vancleavea campi237 - 208.5 Ma
Late/Upper Triassic
Dromomeron gregorii
species
7Animalia : Chordata : Reptilia : Lagerpetonidae : Dromomeron : Dromomeron gregorii228 - 208.5 Ma
Late/Upper Triassic
Dromomeron romeri
species
7Animalia : Chordata : Reptilia : Lagerpetonidae : Dromomeron : Dromomeron romeri228 - 208.5 Ma
Late/Upper Triassic
Aetosauria
unranked clade
99Animalia : Chordata : Reptilia : Eosuchia : Aetosauria228 - 208.5 Ma
Late/Upper Triassic
Archosauriformes
unranked clade
99Animalia : Chordata : Reptilia : Eosuchia : Archosauriformes228 - 208.5 Ma
Late/Upper Triassic
Crosbysaurus harrisae
species
7Animalia : Chordata : Reptilia : Crosbysaurus : Crosbysaurus harrisae228 - 208.5 Ma
Late/Upper Triassic
Dinosauria
order
4Animalia : Chordata : Reptilia : Dinosauria237 - 208.5 Ma
Late/Upper Triassic
Phytosauria
unranked clade
99Animalia : Chordata : Reptilia : Eosuchia : Phytosauria237 - 208.5 Ma
Late/Upper Triassic
Poposaurus gracilis
species
7Animalia : Chordata : Reptilia : Poposauridae : Poposaurus : Poposaurus gracilis237 - 208.5 Ma
Late/Upper Triassic
Prolacertiformes
unranked clade
99Animalia : Chordata : Reptilia : Eosuchia : Prolacertiformes228 - 208.5 Ma
Late/Upper Triassic
Promystriosuchus sp.
genus
6Animalia : Chordata : Reptilia : Phytosauridae : Promystriosuchus237 - 208.5 Ma
Late/Upper Triassic
Protecovasaurus lucasi
species
7Animalia : Chordata : Reptilia : Protecovasaurus : Protecovasaurus lucasi228 - 208.5 Ma
Late/Upper Triassic
Revueltosaurus sp.
genus
6Animalia : Chordata : Reptilia : Eosuchia : Revueltosaurus228 - 208.5 Ma
Late/Upper Triassic
Suchia
unranked clade
99Animalia : Chordata : Reptilia : Eosuchia : Suchia228 - 208.5 Ma
Late/Upper Triassic
Tecovasaurus sp.
genus
6Animalia : Chordata : Reptilia : Tecovasaurus228 - 208.5 Ma
Late/Upper Triassic
Trilophosaurus sp.
genus
6Animalia : Chordata : Reptilia : Trilophosauridae : Trilophosaurus228 - 208.5 Ma
Late/Upper Triassic
Trilophosaurus buettneri
species
7Animalia : Chordata : Reptilia : Trilophosauridae : Trilophosaurus : Trilophosaurus buettneri228 - 208.5 Ma
Late/Upper Triassic
Leptosuchus sp.
genus
6Animalia : Chordata : Reptilia : Thecodontia : Parasuchidae : Leptosuchus237 - 208.5 Ma
Late/Upper Triassic
Leptosuchus crosbiensis
species
7Animalia : Chordata : Reptilia : Thecodontia : Parasuchidae : Leptosuchus : Leptosuchus crosbiensis237 - 208.5 Ma
Late/Upper Triassic
Leptosuchus studeri
species
7Animalia : Chordata : Reptilia : Thecodontia : Parasuchidae : Leptosuchus : Leptosuchus studeri237 - 208.5 Ma
Late/Upper Triassic
Mystriosuchinae
subfamily
5.3Animalia : Chordata : Reptilia : Eosuchia : Parasuchidae : Mystriosuchinae228 - 208.5 Ma
Late/Upper Triassic
Rutiodon sp.
genus
6Animalia : Chordata : Reptilia : Phytosauridae : Rutiodon228 - 208.5 Ma
Late/Upper Triassic
Machaeroprosopus gregorii
species
7Animalia : Chordata : Reptilia : Thecodontia : Parasuchidae : Smilosuchus : Machaeroprosopus gregorii237 - 208.5 Ma
Late/Upper Triassic
Postosuchus kirkpatricki
species
7Animalia : Chordata : Reptilia : Crocodylia : Rauisuchidae : Postosuchus : Postosuchus kirkpatricki237 - 208.5 Ma
Late/Upper Triassic
Otischalkia elderae
species
7Animalia : Chordata : Reptilia : Rhynchosauria : Rhynchosauridae : Otischalkia : Otischalkia elderae237 - 208.5 Ma
Late/Upper Triassic
Calyptosuchus wellesi
species
7Animalia : Chordata : Reptilia : Thecodontia : Aetosauridae : Calyptosuchus : Calyptosuchus wellesi237 - 208.5 Ma
Late/Upper Triassic
Desmatosuchus spurensis
species
7Animalia : Chordata : Reptilia : Thecodontia : Desmatosuchidae : Desmatosuchus : Desmatosuchus spurensis237 - 208.5 Ma
Late/Upper Triassic
Sierritasuchus macalpini
species
7Animalia : Chordata : Reptilia : Stagonolepididae : Sierritasuchus : Sierritasuchus macalpini237 - 208.5 Ma
Late/Upper Triassic
Stagonolepididae
unranked clade
99Animalia : Chordata : Reptilia : Eosuchia : Stagonolepididae228 - 208.5 Ma
Late/Upper Triassic
Tecovasuchus sp.
genus
6Animalia : Chordata : Reptilia : Stagonolepididae : Tecovasuchus237 - 208.5 Ma
Late/Upper Triassic
Tecovasuchus chatterjeei
species
7Animalia : Chordata : Reptilia : Stagonolepididae : Tecovasuchus : Tecovasuchus chatterjeei237 - 208.5 Ma
Late/Upper Triassic
Spinosuchus caseanus
species
7Animalia : Chordata : Reptilia : Trilophosauridae : Spinosuchus : Spinosuchus caseanus237 - 208.5 Ma
Late/Upper Triassic
Procolophonidae
family
5Animalia : Chordata : Reptilia : Procolophonidae228 - 208.5 Ma
Late/Upper Triassic
Sphenodontia
suborder
4.3Animalia : Chordata : Reptilia : Rhynchocephalia : Sphenodontia228 - 208.5 Ma
Late/Upper Triassic
Paleollanosaurus fraseri
species
7Animalia : Chordata : Reptilia : Rhynchocephalia : Sphenodontidae : Paleollanosaurus : Paleollanosaurus fraseri228 - 208.5 Ma
Late/Upper Triassic
Thecodontia
order
4Animalia : Chordata : Reptilia : Thecodontia228 - 208.5 Ma
Late/Upper Triassic
Coelophysis sp.
genus
6Animalia : Chordata : Saurischia : Coelophysidae : Coelophysis237 - 208.5 Ma
Late/Upper Triassic
Caseosaurus crosbyensis
species
7Animalia : Chordata : Reptilia : Dinosauria : Herrerasauridae : Caseosaurus : Caseosaurus crosbyensis237 - 208.5 Ma
Late/Upper Triassic
Prosauropoda
unranked clade
99Animalia : Chordata : Saurischia : Fulengia : Prosauropoda228 - 208.5 Ma
Late/Upper Triassic
Theropoda
unranked clade
99Animalia : Chordata : Saurischia : Theropoda228 - 208.5 Ma
Late/Upper Triassic

References

Cope E. D. A contribution to the vertebrate paleontology of Texas, Proceedings of the American Philosophical Society 30 137, 123-131
Case E. C. (1920) On a very perfect thoracic shield of a large labyrinthodont in the geological collections of the University of Michigan, Occasional Papers of the Museum of Zoology, University of Michigan 82, 1-3
Case E. C. (1920) Preliminary description of a new suborder of phytosaurian reptiles with a description of a new species of Phytosaurus, Journal of Geology 28 6, 524-535
Case E. C. (1921) A new species of Ceratodus from the Upper Triassic of western Texas, Occasional Papers of the Museum of Zoology, University of Michigan 101, 1-2
Case E. C. (1922) New reptiles and stegocephalians from the Upper Triassic of western Texas, Carnegie Institute of Washington Publication 221, 1-84
Case E. C. (1927) The vertebral column of Coelophysis Cope, Contributions from the Museum of Paleontology, University of Michigan 2, 209-223
Case E. C. (1928) Indications of a cotylosaur and of a new form of fish from the Triassic Beds of Texas, with remarks on the Shinarump conglomerate, Contributions of the Museum of Paleontology of the University of Michigan 3, 1-14
Warthin A. S. (1928) Fossil fishes from the Triassic of Texas, Contributions from the Museum of Paleontology, University of Michigan 3 2, 15-18
Huene F. v. (1932) Die fossile Reptil-Ordnung Saurischia, ihre Entwicklung und Geschichte [The fossil reptile order Saurischia, their development and history], Monographien zur Geologie und Palaeontologie, serie 1 4 1-2, 1-361
Case E. C. (1932) On the caudal region of Coelophysis sp. and on some new or little known forms from the Upper Triassic of western Texas, Contributions from the Museum of Paleontology, University of Michigan 4 3, 81-91
Case E. C., White T. E. (1934) Two new specimens of phytosaurs from the Upper Triassic of Western Texas, Contributions from the Museum of Paleontology, University of Michigan 4, 133-142
Sawin H. J. (1944) Amphibians from the Dockum Triassic of Howard County, Texas, Contributions to Geology, The University of Texas 4401, 361-399
Murry P. A. (1981) A new species of freshwater hybodont from the Dockum Group (Triassic) of Texas, Journal of Paleontology 55 3, 603-607
Long R. A., Ballew K. L. (1985) Aetosaur dermal armor from the Late Triassic of southwestern North America, with special reference to material from the Chinle Formation of Petrified Forest National Park, Museum of Northern Arizona Bulletin 54, 45-68
Murry P. A. (1986) Vertebrate paleontology of the Dockum Group, western Texas and eastern New Mexico, The Beginning of the Age of Dinosaurs: Faunal Change Across the Triassic–Jurassic Boundary. Cambridge University Press, Cambridge, 109-137
Murry P. A. (1989) Geology and paleontology of the Dockum Formation (Upper Triassic), west Texas and eastern New Mexico, Dawn of the Age of Dinosaurs in the American Southwest, New Mexico Museum of Natural History, Albuquerque, 102-144
Long R. A., Murry P. A. (1995) Late Triassic (Carnian and Norian) tetrapods from the southwestern United States, New Mexico Museum of Natural History and Science Bulletin 4, 1-254
Hunt A. P., Lucas S. G., et al (1998) Late Triassic dinosaurs from the western United States, Géobios 31 4, 511-531
Heckert A. B. (2004) Late Triassic microvertebrates from the lower Chinle Group (Otischalkian-Adamanian: Carnian), southwestern U.S.A., New Mexico Museum of Natural History and Science Bulletin 27, 1-170
Mutter R. J., Heckert A. B. (2006) Re-investigation of enigmatic fish bones known as colobodontid/perleidid toothplates from the Upper Triassic Chinle Group (southwestern U.S.A.), The Triassic-Jurassic Terrestrial Transition. New Mexico Museum of Natural History and Science Bulletin 37, 530-542
Martz J. W., Small B. J. (2006) Tecovasuchus chatterjeei, a new aetosaur (Archosauria: Stagonolepididae) from the Tecovas Formation (Carnian, Upper Triassic) of Texas, Journal of Vertebrate Paleontology 26 2, 308-320
Parker W. G., Stocker M. R., et al (2008) A new desmatosuchine aetosaur (Archosauria: Suchia) from the Upper Triassic Tecovas Formation (Dockum Group) of Texas, Journal of Vertebrate Paleontology 28 3, 692-701 doi:10.1671/0272-4634(2008)28[692:ANDAAS]2.0.CO;2
Spielmann J. A., Lucas S. G., et al (2013) New record of Spinosuchus caseanus (Archosauromorpha: Trilophosauridae) from the Late Triassic (Adamanian) of West Texas, New Mexico Museum of Natural History and Science Bulletin 61, 573-576
Sarıgül V. (2016) New basal dinosauromorph records from the Dockum Group of Texas, USA, Palaeontologia Electronica 19 2, 21A
Lucas S. G., Rinehart L. F., et al (2016) Rotten Hill: A Late Triassic bonebed in the Texas Panhandle, USA, New Mexico Museum of Natural History and Science Bulletin 72
Data courtesy of: PBDB: The Paleobiology Database, Creative Commons CC-BY licenced. , GBIF: the Global Biodiversity Information Facility, various licences, iDigBio, various licences, and EOL: The Encyclopedia of Life (Open Data Public Domain). Because fossils are made of minerals too!
 
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