Semin Ovrag, PIN 156: Late Severodvinian, Russian Federation

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Chroniosuchidae
Jugosuchus hartmanni n. sp. Ivakhnenko 1980
Golubev 1998 8 specimens
PIN 156/250, 251, 254, 256-260
Amphibia - Temnospondyli - Dvinosauridae
Dvinosaurus primus Amalitzki 1921
Sennikov 1997
Kotlassidae
Microphon exiguus Ivakhnenko 1983
Ivakhnenko 2008
Gorgonopidae
Arctognathus progressus n. sp. Hartmann-Weinberg 1938
Ivakhnenko 2003 6 specimens
PIN 156/5, skull (type), 156/6, 51, 56, 60, 70
Anomodontia - Cryptodontidae
Idelesaurus tataricus n. gen., n. sp. Kurkin 2006
Kurkin 2006 7 specimens
PIN 156/114 (type), 156/4, 156/16, 156/17, 156/121, 156/122, 156/126
Reptilia
Eorasaurus olsoni n. gen., n. sp. Sennikov 1997
Sennikov 1997 1 individual
PIN 156/109 (holotype), 156/108, 110, 111, material representing a single individual
Reptilia - Pareiasauridae
Proelginia permiana n. gen., n. sp. Hartmann-Weinberg 1937
3 individuals
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
see common names

Geography
Country:Russian Federation State/province:Tatarstan County:Tetyushi
Coordinates: 55.0° North, 48.8° East (view map)
Paleocoordinates:29.3° North, 43.5° East
Basis of coordinate:based on nearby landmark
Geographic resolution:small collection
Time
Period: Permian Epoch: Guadalupian
Stage: Capitanian 10 m.y. bin: Permian 4
Key time interval: Late Severodvinian Other zone:  Proelginia permiana
Age range of interval: 264.28 - 259.51 m.y. ago
Stratigraphy
Stratigraphic resolution:group of beds
Stratigraphy comments: 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.

Lithology and environment
Primary lithology:gray,red sandstone
Includes fossils?Y
Lithology description: 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).
Environment:terrestrial indet. Tectonic setting:cratonic basin
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Articulated whole bodies:none
Associated major elements:some
Disassociated major elements:some
Collection methods and comments
Collection methods:field collection,survey of museum collection
Reason for describing collection:taxonomic analysis
Museum repositories:PIN
Metadata
Also known as:Semin Ravine, Syomin Ovrag, Semin-Schlucht; Ilinskoe, Il'inskoe, Ilyinskoe, Iljinskoje
Database number:80712
Authorizer:J. Mueller, R. Butler Enterer:J. Dummasch, T. Liebrecht, R. Butler
Modifier:R. Butler Research group:vertebrate
Created:2008-05-06 01:30:47 Last modified:2017-12-04 08:20:51
Access level:the public Released:2008-05-06 01:30:47
Creative Commons license:CC BY
Reference information

Primary reference:
31376. A. Hartmann-Weinberg. 1937. Pareiasauriden als Leitfossilien [Pareiasaurids as guide fossils]. Problemy paleontologii 213:649-712 [J. Mueller/T. Liebrecht/T. Liebrecht]

Secondary references:

78545% 47000J. 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]
63602 V. K. Golubev. 1998. Revision of the Late Permian Chroniosuchians (Amphibia, Anthracosauromorpha) from Eastern Europe. Paleontological Journal 32(4):390-401 [R. Butler/R. Butler]
63997 V. K. Golubev. 2000. The Faunal Assemblages of Permian Terrestrial Vertebrates from Eastern Europe. Paleontological Journal 34:S211-S224 [R. Butler/R. Butler]
63003 M. F. Ivakhnenko. 2003. Eotherapsids from the East European Placket (Late Permian). Paleontological Journal 37(Suppl. 4):S339-S465 [R. Butler/R. Butler]
63557 M. F. Ivakhnenko. 2008. Cranial morphology and evolution of Permian Dinomorpha (Eotherapsida) of Eastern Europe. Paleontological Journal 42(9):859-995 [R. Butler/R. Butler/R. Butler]
28657 M. F. Ivakhnenko. 2008. Podklass Parareptilia. In M. F. Ivakhnenko and E. N. Kurotchkin (eds.), Iskopaemye pozvonotchnye Rossii i sopredel'nykh stran: Iskopaemye reptilii i ptitsy, Tchast' 1 [Fossil vertebrates of Russia and adjacent countries: Fossil reptiles and birds, Part 1], GEOS, Moscow 49-85 [J. Mueller/T. Liebrecht/T. Liebrecht]
28951 A. A. Kurkin. 2006. A New Dicynodont (Anomodontia, Eotherapsida) from the Upper Permian of Tatarstan. Paleontological Journal 40(4):434-437 [J. Mueller/T. Liebrecht/R. Butler]
29616 M. S. Y. Lee. 1997. A taxonomic revision of pareiasaurian reptiles: implications for Permian terrestrial paleoecology. Modern Geology 21:231-298 [J. Mueller/T. Liebrecht/M. Carrano]
47937 A. G. Sennikov. 1997. [An enigmatic reptile from the Upper Permian of the Volga River Basin]. Paleontologicheskii Zhurnal 1997(1):95-103 [R. Butler/R. Butler]