Tecovas Formation

Tecovas Formation
Stratigraphic range: Upper Triassic, 221.5–212 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Unit of	Dockum Group
Underlies	Trujillo Formation
Overlies	Santa Rosa Formation and Camp Springs Formation
Location
Region	Texas, Crosby County
Country	United States

The Tecovas Formation is a geological formation in the Texas panhandle and eastern New Mexico. It is one of several formations encompassed by the Late Triassic Dockum Group.^[1]

The lower unit of the Cooper Canyon Formation in Garza County to the south is stratigraphically equivalent to the Tecovas Formation. It is also contiguous with the Garita Creek Formation of New Mexico, as well as partially to the Santa Rosa Formation.^[2][3][4]

Vertebrate fauna

Vertebrates of the Tecovas Formation
Taxa	Presence	Notes	Images
Adelobasileus[5]		A mammaliamorph
Caseosaurus[1]		A herrerasaurid similar to Chindesaurus	Caseosaurus holotype ilium UMMP 8870
Postosuchus		A rauisuchian
Tecovasaurus[1]		An amniote (a possible cynodont according to Kammerer et al. 2012[6])
Tecovasuchus[7]		An aetosaur belonging to Paratypothoracisini
Soumyasaurus[8]		A silesaurid

See also

• List of dinosaur-bearing rock formations

References

1. Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Triassic, North America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 518–521. ISBN 0-520-24209-2.
2. Martz, J. W. (2008). Lithostratigraphy, chemostratigraphy, and vertebrate biostratigraphy of the Dockum Group (Upper Triassic), of southern Garza County, West Texas (Unpublished PhD thesis). Texas Tech University. Retrieved 16 November 2021.
3. Martz, J. W.; Mueller, B.; Nesbitt, S. J.; Stocker, M. R.; Parker, W. G.; Atanassov, M.; Fraser, N.; Weinbaum, J.; Lehane, J. (2013). "A taxonomic and biostratigraphic re-evaluation of the Post Quarry vertebrate assemblage from the Cooper Canyon Formation (Dockum Group, Upper Triassic) of southern Garza County, western Texas". Earth and Environmental Science Transactions of the Royal Society of Edinburgh. 103 (3–4): 339–364. doi:10.1017/S1755691013000376. S2CID 129744424.
4. Sarıgül, V. (2016). "New basal dinosauromorph records from the Dockum Group of Texas, USA". Palaeontologia Electronica. 19 (2): 19.2.21A. doi:10.26879/564.
5. Lucas, S.G.; Luo, Z. (1993). "Adelobasileus from the upper Triassic of west Texas: the oldest mammal". Journal of Vertebrate Paleontology. 13 (3): 309–334. doi:10.1080/02724634.1993.10011512.
6. Christian F. Kammerer, John J. Flynn, Lovasoa Ranivoharimanana and André R. Wyss (2012). "Ontogeny in the Malagasy Traversodontid Dadadon isaloi and a Reconsideration of its Phylogenetic Relationships". Fieldiana Life and Earth Sciences. 5: 112–125. doi:10.3158/2158-5520-5.1.112.
7. 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. doi:10.1671/0272-4634(2006)26[308:tcanaa]2.0.co;2.
8. Volkan Sarıgül; Federico Agnolín; Sankar Chatterjee (2018). "Description of a multitaxic bone assemblage from the Upper Triassic Post Quarry of Texas (Dockum group), including a new small basal dinosauriform taxon" (PDF). Historia Natural, Tercera Serie. 8 (1): 5–24.