Monastery Ravine, Volga River ('First' Formation) (Permian of Russian Federation)

Where: Russian Federation (55.0° N, 48.9° E: paleocoordinates 27.7° N, 43.3° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: 'First' Formation, Wordian (266.9 - 264.3 Ma)

• Urzhumian beds (Nurgaliev et al. 2015)

Environment/lithology: marine; red shale

• "Generally, the First Formation is composed of red-bed shales and is distinctly subdivided into two parts. The shales of the lower part of the Formation are gypsiferous, containing many interbeds (3-20cm thick) of grey and pink marls and argillaceous dolomites, more rarely of brown siltstones and sandstones. In the upper part of the Formation, shales are more homogeneous and have a few interbeds of terrigenous and carbonate rocks. The shales often bear thin lenses of palygorskite.

•Fossils occur rarely in the Formation and mostly in its upper part. The first bed with fossils lies 10m below the top of the Formation and is composed of reddish-brown thinly bedded shales containing small (3-4mm) distorted valves of conchostrachans. Seven metres above this bed, dull-red unbedded shales, along with conchostrachans, contain the isolated scales of fishes. The scales are 2-5mm in size, black, not oriented and regularly distributed in the rock." (Nurgaliev et al. 2015)

Size class: macrofossils

Primary reference: D. K. Nurgaliev, V. V. Silantiev, and S. V. Nikolaeva. 2015. Type and reference sections of the Middle and Upper Permian of the Volga and Kama River Regions: A Field Guidebook of XVIII International Congress on Carboniferous and Permian. 1-208 [A. Dunhill/B. Allen/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 197593: authorized by Alex Dunhill, entered by Bethany Allen on 17.11.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

• "This section was repeatedly studied in the course of stratigraphic, lithological (Forsh, 1963, Sementovsky, 1973; Gusev, 1996b,1998b), paleomagnetic (Khramov, 1963, Burov and Boronin, 1977, Gialanella, 1997), and paleontological (Silantiev and Esin, 1993; Esaulova, 1998d, 1999; Esaulova et al., 1998; Larochkina and Silantiev, 2007) works. Recent studies, carried out on the section, revealed a new sedimentological and geochemical features (Arefiev and Silantiev, 2014), clarified the paleomagnetic data (Westfahl, 2005, Balabanov, 2014; Balabanov et al., 2009), allowed supplementing the data on tetrapods, fish and plants (Bulanov, 2014, Minikh and Minikh, 2009, Naugolnykh, 2007 and others), helped to identify and describe the paleosol profiles (Inozemtsev et al., 2011, Mouraviev et al., 2015)." (Nurgaliev et al. 2015)
Show authors, comments, and common names
Osteichthyes
 Palaeonisciformes - Palaeoniscidae
Palaeoniscum cf. freieslebeni, Palaeoniscum cf. kasanense, Palaeoniscum kurtum
Palaeoniscum cf. kasanense Geinitz and Vetter 1880
Palaeoniscum kurtum Krotov 1900
 Palaeonisciformes -
Amblypterina costata
Amblypterina costata Eichwald 1860
 Palaeonisciformes - Platysomidae
Kargalichthys efremovi, Eurysomus sp., Platysomus biarmicus
Eurysomus sp. Young 1866
Platysomus biarmicus Von Eichwald 1861
 Elonichthyiformes - Elonichthyidae
Elonichthys sp.
Elonichthys sp. Giebel 1848 ray-finned fish
 Elonichthyiformes - Varialepididae
Varialepis orientalis, Varialepis bergi
Varialepis orientalis Eichwald 1860 ray-finned fish
Varialepis bergi Minikh 1986 ray-finned fish
 Elonichthyiformes - Acrolepidae
"Acrolepis rhombifera" = Palaeostrugia rhombifera
"Acrolepis rhombifera" = Palaeostrugia rhombifera Eichwald 1860 ray-finned fish
Chondrichthyes
 Xenacanthiformes - Xenosynechodontidae
Xenosynechodus sp.
Xenosynechodus sp. Gluckman 1980 elasmobranch
Branchiopoda
 Diplostraca -
Conchostraca indet.
Conchostraca indet. Sars 1867 clam shrimp