Tecovas Formation

{{Infobox rockunit

| name = Tecovas Formation

| image =

| caption =

| type = Geological formation

| age = Upper Triassic,
{{fossilrange|221.5|212|earliest=237|latest=210}}

| period = Norian

| prilithology =

| otherlithology =

| namedfor =

| namedby =

| region = {{Flag|Texas}}, Crosby County

| country = {{Flag|United States}}

| coordinates =

| unitof = Dockum Group

| subunits =

| underlies = Trujillo Formation

| overlies = Santa Rosa Formation and Camp Springs Formation

| thickness =

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}}

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.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}}.

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.{{cite thesis |last1=Martz |first1=J. W. |year=2008 |title=Lithostratigraphy, chemostratigraphy, and vertebrate biostratigraphy of the Dockum Group (Upper Triassic), of southern Garza County, West Texas |type=Unpublished PhD thesis |publisher=Texas Tech University |url=https://ttu-ir.tdl.org/handle/2346/20495 |access-date=16 November 2021}}{{cite journal |last1=Martz |first1=J. W. |last2=Mueller |first2=B. |last3=Nesbitt |first3=S. J. |last4=Stocker |first4=M. R. |last5=Parker |first5=W. G. |last6=Atanassov |first6=M. |last7=Fraser |first7=N. |last8=Weinbaum |first8=J. |last9=Lehane |first9=J. |year=2013 |title=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 |journal=Earth and Environmental Science Transactions of the Royal Society of Edinburgh |volume=103 |issue=3–4 |pages=339–364 |doi=10.1017/S1755691013000376 |s2cid=129744424}}{{Cite journal |last=Sarıgül |first=V. |year=2016 |title=New basal dinosauromorph records from the Dockum Group of Texas, USA |journal=Palaeontologia Electronica |volume=19 |issue=2 |pages=19.2.21A |doi=10.26879/564 |doi-access=free}}

Vertebrate fauna

class="wikitable" align="center" width="100%"
colspan="5" align="center" \|Vertebrates of the Tecovas Formation
Taxa ! Presence ! Notes ! Images
Adelobasileus{{cite journal\|author1=Lucas, S.G.\|author2=Luo, Z.\|year=1993\|title=Adelobasileus from the upper Triassic of west Texas: the oldest mammal\|journal=Journal of Vertebrate Paleontology\|volume=13\|issue=3\|pages=309–334\|doi=10.1080/02724634.1993.10011512}} \| \| A mammaliamorph \|
Caseosaurus \| \| A herrerasaurid similar to Chindesaurus \| Image:Caseosaurus_ilium.jpg holotype ilium UMMP 8870]]
Postosuchus \| \|A rauisuchian \|
Tecovasaurus \| \| An amniote (a possible cynodont according to Kammerer et al. 2012Christian 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.) \|
TecovasuchusMartz, 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. \| \| An aetosaur belonging to Paratypothoracisini \|
SoumyasaurusVolkan 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. \| \| A silesaurid \|

class="wikitable" align="center" width="100%"

colspan="5" align="center" |Vertebrates of the Tecovas Formation

Taxa

! Presence

! Notes

! Images

Adelobasileus{{cite journal|author1=Lucas, S.G.|author2=Luo, Z.|year=1993|title=Adelobasileus from the upper Triassic of west Texas: the oldest mammal|journal=Journal of Vertebrate Paleontology|volume=13|issue=3|pages=309–334|doi=10.1080/02724634.1993.10011512}}

A mammaliamorph

Caseosaurus

A herrerasaurid similar to Chindesaurus

Image:Caseosaurus_ilium.jpg holotype ilium UMMP 8870]]

Postosuchus

|A rauisuchian

Tecovasaurus

An amniote (a possible cynodont according to Kammerer et al. 2012Christian 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.)

TecovasuchusMartz, 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.

An aetosaur belonging to Paratypothoracisini

SoumyasaurusVolkan 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.

A silesaurid

References

Category:Carnian Stage

Category:Triassic geology of Texas

Tecovas Formation

Vertebrate fauna

See also

References