Where: Russian Federation (55.0° N, 48.9° E: paleocoordinates 28.6° N, 43.4° E)
• coordinate estimated from map
• outcrop-level geographic resolution
When: 'Fourth' Formation, Capitanian (264.3 - 259.5 Ma)
• Severodvinian beds (Nurgaliev et al. 2015)
Environment/lithology: fluvial-lacustrine; siltstone and sandstone
• "[The Fourth Formation] is represented by the alternation of siltstones, shales and sandstones with marls and limestones showing the distinct cyclicity. Sandstones are usually bluish or yellowish-grey, and recognised in three levels as lenses 2.50-8.0m thick. Together with shales and siltstones, they form three argillaceous-sandstone members. Carbonate rocks concentrate mostly in the lower and upper parts of the formation, where they, together with shales, form separated argillaceous-carbonate members 4.5m thick at the bottom and 7.8m at the top of the Formation. The lower boundary of the Formation is drawn at the base of the bed of light-grey argillaceous limestone with a distinct vertical structure overlying the upper argillaceous-sandstone member of the Third Formation.
•The Formation contains few fossils. At the base of the Formation, there are ostracods. Upwards in the section, five metres below the top of the formation, the bed of bluish-grey marl, apart from the similar ostracod assemblage, contains large conchostracan shells, fragments of the bivalve Palaeomutela sp., and scales of fishes. Ostracods occur in the more calcareous part of the marl, whereas fish scales occur in the more argillaceous part. The intermediate type of marl contains conchostracans and bivalve shells." (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 197596: 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 |
| Seymouriamorpha - Kotlassidae |
|
| Palaeonisciformes - |
|
| Palaeonisciformes - Platysomidae |
|
| Elonichthyiformes - Varialepididae |
|
| Bivalvia |
| Actinodontida - Palaeomutelidae |
|
| Ostracoda |
| - |
|
| Branchiopoda |
| Diplostraca - |
|
| Cuneatochara |
| - |
|