Starokoltaevo II (Locality 9) (Triassic of Russian Federation)

Also known as Koltayevo II

Where: Bashkortostan, Russian Federation (52.4° N, 55.6° E: paleocoordinates 34.5° N, 42.6° E)

• coordinate estimated from map

• outcrop-level geographic resolution

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

• The Donguz Svita/Gorizont is the "characteristic" tetrapod assemblage for the Perovkan Land Vertebrate Faunachron of Lucas, considered to be of Anisian age (see Lucas 2010). By contrast, Fröbisch (2009) suggested that the lower part of the Donguz Svita/Gorizont is referable to the Nonesian LVF, is of early Anisian age, and can be correlated which subzone B of the Cynognathus AZ of South Africa, while the upper part of the Donguz Svita/Gorizont is referable to the Perovkan LVF, is of late Anisian age, and can be correlated which subzone C of the Cynognathus AZ of South Africa. It is not clear whether this locality belongs to the lower or upper part of the Donguz Svita/Gorizont

Environment/lithology: "channel"; gray, conglomeratic sandstone

• "tributary channel deposits"
• "Grey, cross-bedded, variably grained sandstone with small pebbles of silica rocks and quartz"

Size class: macrofossils

Collection methods: Collections in Saratov State University

Primary reference: N. N. Kalandadze and A. G. Sennikov. 1985. New reptiles from the Middle Triassic in the southern Ural forelands. Paleontological Journal 19(2):73-80 [J. Fröbisch/M. Walther/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 97414: authorized by Richard Butler, entered by Richard Butler on 26.07.2010, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)

Taxonomic list

• A number of taxa (Calleonasus furvus, Rhadiodromus klimovi, Rabidosaurus cristatus, Dongusuchus efremovi & Uralosaurus magnus) were listed from this locality by Gower & Sennikov (2000) and Battail & Surkov (2000); however, Tverdokhlebov et al. (2003), in their review of Russian Triassic localities, list these taxa as coming from Starokoltaevo III (PBDB: 97415) and so they have been entered in that collection. The taxa listed here are only the ones given by Tverdokhlebov et al. (2003).
Osteichthyes
 Dicynodontia -
Calleonasus furvus n. gen. n. sp. Kalandadze 1985 dicynodont
PIN 525/266, left nasal bone. PIN 525/267-270
Reptilia
 Archosauria -
Archosauria indet. Cope 1869 archosaur
Vertebrae & teeth
Amphibia
 Temnospondyli - Mastodonsauridae
"Capitosauridae indet." = Mastodonsauridae
"Capitosauridae indet." = Mastodonsauridae Lydekker 1885 tetrapod
Fragments of dermal bones, lower jaw & teeth
 Temnospondyli - Plagiosauridae
Plagioscutum ochevi Shishkin 1986 tetrapod
Vertebra and ribs