Donguz I, PIN 952 (Triassic of Russian Federation)

Also known as Locality 36; Dongus river; Perovsky settlement;

Where: Orenburg, Russian Federation (51.4° N, 55.3° E: paleocoordinates 33.6° N, 43.4° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Perovkan other zone, Donguz Formation, Anisian (247.2 - 242.0 Ma)

• Outcrop is ~10 meters high. The author does not explicitly state which layer Lystrosuarus klimovi is from in the english text, but bed 3 is marked in Fig. 24. Detailed lithological descriptions are provided for each bed in the russian text.

•Equivalent to the South African "Cynognathus Zone, corresponding to the Upper Buntsandstein of Germany, or to the Scythian." The Cynognathus Zone has recently been split into three time equivalent assemblages, therefore a Scythian age may not be correct.

•Additional note: Tverdokhlebov et al. (2003) assign the locality to the Middle Triassic (Anisian) Donguz Svita. Original stratigraphic data are modified accordingly (TL).

•The Donguz Svita is the "characteristic" tetrapod assemblage for the Perovkan Land Vertebrate Faunachron of Lucas, considered to be of Anisian age (see Lucas 2010)

• group of beds-level stratigraphic resolution

Environment/lithology: fluvial-deltaic; ferruginous, black, gray, green sandstone and lenticular conglomerate

• "deltaic deposits" Tverdokhlebov et al. (2003).
• There are at least three vertebrate-bearing layers at this outcrop, it is unclear whether all of the bones are found in concretions. General outcrop description includes variegated marls, clays, sands and sandstones. Lystrosaurus-bearing concretions = "rather mellow sandstone, which here and there is impregnated with ferrous and manganous compounds, dying the rock into an almost black colour." Layer 8 = clay sandstones of greenish tint. Layer 9 = grey, coarse-granulate sandstones and conglomerates with Ural pebbles.

•Tverdokhlebov et al. (2003) give the following description: "Grey, fine- to medium-grained sandstone with lenses of conglomerate and interlayers of siltstone."

Size class: macrofossils

Preservation: concretion

Collected by P. Klimov in 1935–1936

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

Primary reference: J. A. Efremov. 1940. Predvaritel'noye opisaniye novykh form permskoy i triasovoy fauny nazemnykh pozvonochnykh SSSR [Preliminary description of new forms from the Permian and Triassic terrestrial vertebrate fauna of the USSR]. Trudy Paleontologicheskogo Instituta Akademiy Nauk SSSR 10(2):1-140 [J. Alroy/R. Whatley/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 28850: authorized by John Alroy, entered by Robin Whatley on 25.02.2003, edited by Richard Butler, Bethany Allen and Matthew Carrano

Creative Commons license: CC BY (attribution)

Taxonomic list

• Full taxa list as given in Tverdokhlebov et al. (2003) is not yet entered into the collection since indeterminate taxa already listed by Efremov may have been re-identified later. See references in Tverdokhlebov et al. (2003) for details.
 Elasmobranchii -
Elasmobranchii indet. Bonaparte 1838 elasmobranch
"Ichthyodorulit" is a spine, presumably from Elasmobranchii
 Tetrapoda - Bystrowianidae
Bystrowianidae indet.7 Vjushkov 1957 tetrapod
PIN 952/184, fragmentary scute
 Temnospondyli -
"Eryosuchus tverdochlebovi n. gen. n. sp." = Eryosuchus tverdochlebovi6, "Eryosuchus garjainovi" = Eryosuchus tverdochlebovi5
"Eryosuchus tverdochlebovi n. gen. n. sp." = Eryosuchus tverdochlebovi6 Ochev 1966 tetrapod
"Eryosuchus garjainovi" = Eryosuchus tverdochlebovi5 Ochev 1966 tetrapod
PIN 104/1203, 1278, 2279, 2966, 2950, postcranial bones
 Temnospondyli - Plagiosauridae
Plagioscutum ochevi7 Shishkin 1986 tetrapod
 Therocephalia - Bauriidae
Dongusaurus schepetovi n. gen. n. sp.1
Dongusaurus schepetovi n. gen. n. sp.1 Vjuschkov 1964 therapsid
PIN 952/1, right dentary lacking teeth
 Dicynodontia - Kannemeyeriidae
"Lystrosaurus klimovi n. sp." = Rhadiodromus klimovi
"Lystrosaurus klimovi n. sp." = Rhadiodromus klimovi Efremov 1940 dicynodont
PIN 159/1, partial skull and incomplete skeleton (holotype). PIN 952/111, incomplete skull. PIN 952/13, 18, isolated bones
 Dicynodontia - Dicynodontidae
Rabidosaurus cristatus n. gen. n. sp.1
Rabidosaurus cristatus n. gen. n. sp.1 Kalandadze 1970 dicynodont
PIN 952/100, almost complete skull
 Diapsida - Erythrosuchidae
"Erythrosuchus magnus" = Uralosaurus magnus2
"Erythrosuchus magnus" = Uralosaurus magnus2 Ochev 1980 archosauromorph
PIN 952/95, four presacral vertebrae
 Diapsida -
Dorosuchus neoetus2 Sennikov 1989 archosauromorph
PIN 952/200, ilium
 Pseudosuchia -
Dongusia colorata n. gen. n. sp.3
Dongusia colorata n. gen. n. sp.3 Huene 1940 archosaur
PIN 268/2, dorsal vertebra
 Avemetatarsalia -
Dongusuchus efremovi n. gen. n. sp.2
Dongusuchus efremovi n. gen. n. sp.2 Sennikov 1988 archosaur
PIN 952/15-1, femur (holotype). PIN 952/84-1, epipodials
 Thecodontia -
Thecodontia indet.4 Owen 1859 archosaur
 Dipnomorpha - Ceratodontidae
Ceratodus gracilis7 lungfish
Dental plates
Ceratodus jechartiensis7 Minikh 1977 lungfish
Dental plates
Ceratodus recticristatus7 Vorobyeva and Minikh 1968 lungfish
Dental plates