Semin Ovrag, PIN 156 (Permian of Russian Federation)

Also known as Semin Ravine, Syomin Ovrag, Semin-Schlucht; Ilinskoe, Il'inskoe, Ilyinskoe, Iljinskoje

Where: Tatarstan, Russian Federation (55.0° N, 48.8° E: paleocoordinates 29.3° N, 43.5° E)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Proelginia permiana other zone, Late/Upper Severodvinian (265.0 - 254.0 Ma)

• Ilinskoe Subassemblage of the Sokolki Assemblage; the middle part of the Late Tatarian (the later part of the Severodvinian) (Golubev 2000; Benton 2012, Geology).

•"Upper Permian, Upper Tatarian Substage, Severodvinian Horizon" (Kurkin, 2008).

•Eorasaurus olsoni comes from the upper substage of the Severodvinian regional stage (Sennikov 1997, 2011). Recent magnetostratigraphic evidence suggests that the base of the Severodvinian stage is within the Capitanian (approximately middle Capitanian), but there exists uncertainty regarding the age of the upper boundary of the Severodvinian, which may be close to the Wuchiapingian–Changhsingian boundary or to the Capitanian–Wuchiapingian boundary.

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; gray, red sandstone

• The bone bearing layer is a 2 m thick, reddish-grey sandstone which is underlain by an alternation of mudstones, sands and marls, and is overlain by bluish-gray mudstones with thin intercalations of grey clay-sands (Efremov 1940, Trudy Paleont. Inst. AN SSSR).

Size class: macrofossils

Reposited in the PIN

Primary reference: A. Hartmann-Weinberg. 1937. Pareiasauriden als Leitfossilien [Pareiasaurids as guide fossils]. Problemy paleontologii 213:649-712 [J. Mueller/T. Liebrecht/T. Liebrecht]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 80712: authorized by Johannes Mueller, entered by Jana Dummasch on 06.05.2008, edited by Torsten Liebrecht and Richard Butler

Creative Commons license: CC BY (attribution)

Taxonomic list

Osteichthyes
 Temnospondyli - Dvinosauridae
Dvinosaurus primus5 Amalitzki 1921 tetrapod
 Tetrapoda - Chroniosuchidae
"Jugosuchus hartmanni n. sp." = Chroniosaurus dongusensis1
"Jugosuchus hartmanni n. sp." = Chroniosaurus dongusensis1 Tverdochlebova 1972 tetrapod
PIN 156/250, 251, 254, 256-260
Reptilia
 Procolophonia - Pareiasauridae
"Proelginia permiana n. gen. n. sp." = Scutosaurus karpinskii
"Proelginia permiana n. gen. n. sp." = Scutosaurus karpinskii Amalitzky 1922 parareptile
156/2 (type), PIN 156/1, 156/3, 156/305*, 156/306*; asterisks mark two lower jaws listed in Lee (1997); number of individuals is based on presence of three skulls
 Gorgodontia - Gorgonopidae
"Arctognathus progressus n. sp." = Sauroctonus progressus2
"Arctognathus progressus n. sp." = Sauroctonus progressus2 Hartmann-Weinberg 1938 reptile
PIN 156/5, skull (type), 156/6, 51, 56, 60, 70
 Eosuchia -
Eorasaurus olsoni n. gen. n. sp.5
Eorasaurus olsoni n. gen. n. sp.5 Sennikov 1997 archosauromorph
PIN 156/109 (holotype), 156/108, 110, 111, material representing a single individual
Osteichthyes
 Therapsida - Cryptodontidae
Idelesaurus tataricus n. gen. n. sp.4
Idelesaurus tataricus n. gen. n. sp.4 Kurkin 2006 therapsid
PIN 156/114 (type), 156/4, 156/16, 156/17, 156/121, 156/122, 156/126
 Seymouriamorpha - Kotlassidae
Microphon exiguus3 Ivakhnenko 1983 tetrapod