Cooper Canyon Formation: Difference between revisions - Wikipedia


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{{Short description|Geological formation in Texas and New Mexico, US}}

{{Infobox rockunit

| name = Cooper Canyon Formation

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| namedfor =

| namedby =

| region = {{Flag|Texas}} <br /> {{Flag|New Mexico}}

| country = {{Flag|United States}}

| coordinates = {{coord|33.127|N|101.366|W|display:inline}}

| unitof = [[Dockum Group]]

| subunits =

| underlies = [[Redonda Formation]]

| overlies = [[Trujillo Formation]], possibly [[Camp Springs Formation]], andpossibly [[Colorado City Formation]]

| thickness =

| extent =

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| map_caption =

}}

The '''Cooper Canyon Formation''' is a geological [[Formation (geology)|formation]] of [[Norian]] age in [[Texas]] and [[New Mexico]]. It is one of several formations encompassed by the [[Dockum Group]].<ref name="triassicdistribution">Weishampel, David B; et al. (2004). "[https://books.google.com/books?id=h4WRTHfTzXsC&pg=PA521&dq=%22Cooper%20Canyon%20Formation%22&pg=PA521 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}}.</ref><ref name=Lehman_1992/>

The type area of the formation is situated in [[Garza County, Texas]], southeast of [[Lubbock, Texas|Lubbock]]. The Cooper Canyon Formation consist of reddish [[siltstone]] and [[mudstone]] with [[lens (geology)|lenses]] of [[sandstone]] and [[conglomerate (geology)|conglomerate]]. Thickness of the formation in the type area is 161.5 meters. It increases to the south, and in some places exceeds 200 m. The formation contains diverse fossils, including [[vertebrate]] remains.<ref name="Lehman_1992" />

== Regional equivalents ==

The '''[[Bull Canyon Formation''']] in eastern New Mexico is equivalent to the upper part of the Cooper Canyon Formation. Some researchers argue that the latter name should be abandoned.<ref name="Lehman_1992" /> The middle and lower parts of the Cooper Canyon are correlated to the [[Trujillo Formation|Trujillo]] and [[Tecovas Formation|Tecovas]] formations (respectively) further north in the [[Texas Panhandle]]. The lowermost part of the Cooper Canyon Formation may also be correlated to the [[Colorado City Formation]] further south at [[Otis Chalk]] ([[Howard County, Texas|Howard County]]).<ref name="Martz08" /><ref name="Martz13" /><ref name="Sar16" />

==Vertebrate fauna==

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Skull and postcranial skeleton (specimen TTUP 9425).<ref name=":2" /><ref name="SL12"/>

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Specimens currently only described in unpublished theses, initially referred to a new informal genus "Macysuchus".<ref name=":2">{{Cite thesis |last=McQuilkin |first=K. S. |year=1998 |title=An Articulated Phytosaur Skeleton: Preparation Techniques From Field to Exhibit |type=Unpublished MSc thesis |publisher=[[Texas Tech University]] |url=https://ttu-ir.tdl.org/bitstream/handle/2346/16514/31295013300354.pdf}}</ref> Referred to ''R. gregorii'' by Spielmann and Lucas (2012).<ref name="SL12">{{cite journal |last1=Spielmann |first1=J. A. |last2=Lucas |first2=S. G. |year=2012 |title=Tetrapod Fauna of the Upper Triassic Redonda Formation East-central New Mexico: The Characteristic Assemblage of the Apachean Land-vertebrate Faunachron |url=https://wwwbooks.google.com/books/edition/Tetrapod_Fauna_of_the_Upper_Triassic_Red/?id=r-woCgAAQBAJ?hl=en&gbpv=1 |journal=Bulletin of the New Mexico Museum of Natural History and Science |volume=55}}</ref>

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''[[Garzapelta]]''

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''G. muelleri''<ref name="Gpelta">{{Cite journal|last1=Reyes |first1=W. A. |last2=Martz |first2=J. W. |last3=Small |first3=B. J. |title=''Garzapelta muelleri'' gen. et sp. nov., a new aetosaur (Archosauria: Pseudosuchia) from the Late Triassic (middle Norian) middle Cooper Canyon Formation, Dockum Group, Texas, USA, and its implications on our understanding of the morphological disparity of the aetosaurian dorsal carapace |year=2024 |journal=The Anatomical Record |volume=307 |issue=4 |pages=1271–1299 |doi=10.1002/ar.25379 }}</ref>

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*Middle

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*[https://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=NMTRb%3B0 Bull Canyon Formation of Chinle Group] by USGS

[[Category:Triassic formations of New Mexico]]

[[Category:Triassic geology of Texas]]

[[Category:Norian Stage]]