PBDB Collection

Arlington Archosaur Site (facies A) (Cretaceous of the United States)

Also known as AAS, UTA Location 50

Where: Tarrant County, Texas (32.8° N, 97.1° W: paleocoordinates 31.2° N, 61.8° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Lewisville Formation (Woodbine Group), Middle Cenomanian (99.6 - 93.5 Ma)

• bed-level stratigraphic resolution

Environment/lithology: delta plain; pyritic, brown, sandy siltstone and gray, sandy, carbonaceous siltstone

• "low-energy freshwater or brackish system, such as a tidal coastal wetland proximal to a river channel"

• "a thin (50-60 cm thick) peat that has locally high claystone, sulphur, and pyrite content. The peat is laterally continuous...highly fossiliferous...carbonized wood, branches, twigs, and fallen logs"

•Facies A: "a dark brown sandy siltstone at least 50 cm deep overlain by a dark gray carbonaceous sandy siltstone 30-40 cm thick, the upper portion of which contains slickensides. Sulfur bands, gypsum, and pyrite are prevalent throughout this layer."

Size classes: macrofossils, mesofossils, microfossils

Collected by P. Kirchhoff, B. Walker, A. Sahlstein, D. Main in 2003, 2007, 2013–; reposited in the DMNH

Collection methods: surface (float), surface (in situ), mechanical,

Primary reference: D. J. Main, C. R. Noto, and D. B. Weishampel. 2014. Postcranial anatomy of a basal hadrosauroid (Dinosauria: Ornithopoda) from the Cretaceous (Cenomanian) Woodbine Formation of north Texas. In D. A. Eberth & D. C. Evans (ed.), Hadrosaurs 77-95 [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 172153: authorized by Matthew Carrano, entered by Matthew Carrano on 27.07.2015, edited by Patricia Holroyd, Evangelos Vlachos and Philip Mannion

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Bivalvia
-	Bivalvia indet.⁴ Bivalvia indet.⁴ Linnaeus 1758 clam
Osteichthyes
Osteichthyes -	Osteichthyes indet.⁴ Osteichthyes indet.⁴ Huxley 1880 bony fish
Dipnoi - Ceratodontidae	Ceratodus carteri⁴ Ceratodus carteri⁴ lungfish
Reptilia
Eosuchia -	? Sauria indet.⁴ ? Sauria indet.⁴ Gauthier 1984 crown diapsid
Theropoda -	Theropoda indet.⁵, Tyrannosauroidea indet.⁵ Theropoda indet.⁵ Marsh 1881 theropod DMNH 2013-07-0492, phalanx; DMNH 2013-07-1082, tooth Tyrannosauroidea indet.⁵ Walker 1964 coelurosaur DMNH 2013-07-1701, tooth
Theropoda - Dromaeosauridae	Dromaeosaurinae indet.⁵ Dromaeosaurinae indet.⁵ Matthew and Brown 1922 maniraptoran DMNH 2013-07-1080, DMNH 2014-06-02, teeth
Theropoda -	Carcharodontosauria indet.⁵ Carcharodontosauria indet.⁵ Benson et al. 2010 allosauroid DMNH 2013-07-0494, manual ungual; DMNH 2013-07-1081, 1083, teeth; DMNH 2013-07-1990, chevron
Ornithischia -	Ornithopoda indet. Ornithopoda indet. Marsh 1881 ornithopod
Loricata - Paralligatoridae	Scolomastax sahlsteini n. gen. n. sp.⁶ Scolomastax sahlsteini n. gen. n. sp.⁶ Noto et al. 2020 crocodilian DMNH 2013-07-125
Loricata - Paluxysuchidae	Deltasuchus motherali n. gen. n. sp.¹ Deltasuchus motherali n. gen. n. sp.¹ Adams et al. 2017 crocodilian
Testudinata -	Testudinata indet. Testudinata indet. Oppel 1811 turtle
Testudines - Bothremydidae	Pleurochayah appalachius n. gen. n. sp.³ Pleurochayah appalachius n. gen. n. sp.³ Adrian et al. 2021 sideneck turtle DMNH 2013-07-1405, isolated left c4
Testudines - Trionychidae	Trionychidae indet.² Trionychidae indet.² Gray 1825 softshell turtle DMNH 2013-07-1304, isolated left nuchal
Testudinata - Helochelydridae	Naomichelys sp.² Naomichelys sp.² Hay 1908 turtle Material. DMNH 2013-07-1715, nu (Figure 4.1-8); DMNH 2013-07-0530, left c1 (Figure 4.5-4.8); DMNH 2013-07-0543, partial left c3 (Figure 4.9-4.12); DMNH 2013-07-0559, left c7 (Figure 4.13-16); DMNH 2013-07-0706, cf. n4 (Figure 4.17-20); DMNH 2013-07-0770, right partial n7/8 (Figure 4.21-24); DMNH 2013-07-0570, pygal (Figure 4.25-28); DMNH 2013-07-0711, right hyoplastron and Im 2 (Figure 5.1-4); DMNH 2013-07-0511, left hyoplastron (Figure 5.5-8); DMNH 2013-07-1717, right xiphiplastron (Figure 5.9-12); DMNH 2013-07-0603, partial mesoplastron (Figure 5.13-16).
Testudinata - Baenidae	"Trinitichelys maini n. sp." = Gehennachelys maini² "Trinitichelys maini n. sp." = Gehennachelys maini² Adrian et al. 2019 turtle Holotype. DMNH 2013-07-0712, an anterior lobe of a plastron (Figure 3.1-4). This specimen was selected as the type because it shows diagnostic characters distinct from the known morphology of the basal baenids T. hiatti and Neurankylus. All additional baenid material from the AAS is referred to “T.” maini sp. nov. based on similarity in shell sculpturing and associated co-ossification.
Mammalia
Multituberculata -	Multituberculata indet.⁴ Multituberculata indet.⁴ multituberculate
Amphibia
Caudata -	Caudata indet.⁴ Caudata indet.⁴ Scopoli 1777 salamander
Caudata - Urodela	? Cryptobranchidae indet.⁴ ? Cryptobranchidae indet.⁴ Cope 1889 hellbender
Salientia -	Anura indet.⁴ Anura indet.⁴ Fischer von Waldheim 1813 frog
Chondrichthyes
Elasmobranchii -	Elasmobranchii indet.⁴ Elasmobranchii indet.⁴ elasmobranch
Angiospermae
-	Stellatopollis sp. Stellatopollis sp. Doyle 1976
Nymphaeales - Nymphaeaceae	Dichastopollenites sp. Dichastopollenites sp. May 1975 water lily

¹Adams et al. 2017; ²Adrian et al. 2019; ³Adrian et al. 2021; ⁴Noto 2015; ⁵Noto et al. 2022; ⁶Noto et al. 2020