Also known as Volga locality, coll. No. 156, PIN, Volga Expedition of 1931; Klyuchevoy Ravine; Ilinskoe, Il'inskoe, Ilyinskoe, Iljinskoje

Where: Tatarstan, Russian Federation (55.0° N, 48.8° E: paleocoordinates 29.5° N, 43.1° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: IV zone, Late/Upper Severodvinian to Late/Upper Severodvinian (264.3 - 254.1 Ma)

• Chronostratigraphy originally entered as >>Zechstein<<. Klyutchevoy Ravine [Klyutchevoy Ovrag] is lower Vyatkian according to Ivakhnenko (2008). Ilinskoe Subassemblage of the Sokolki Assemblage is regarded as Late Severodvinian to Early Vyatkian in Golubev (2005, New Mexico Mus. Nat. Hist. Sci. Bull. 30).

•Formation name >>Sarmin series<< is removed for it never was a lithostratigraphic term and for it is not used at all in more recent literature (TL).

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; gray, red sandstone

Size class: macrofossils

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 28855: authorized by John Alroy, entered by Robin Whatley on 25.02.2003

Creative Commons license: CC BY (attribution)