Where: Russian Federation (55.8° N, 48.9° E: paleocoordinates 28.3° N, 42.8° E)
• coordinate stated in text
• outcrop-level geographic resolution
When: Krutoovrazhnaya Member (Isheevo Formation), Wordian (266.9 - 264.3 Ma)
• Urzhumian beds, numbered P12/141 - P13/148 from bottom to top; P12/141 - P13/147 are the upper part of the Krutoovrazhnaya Member, and the highest part of the Urzhumian Stage, while P13/148 is the lowest part of the Severodvinian Stage (Nurgaliev et al. 2015)
Environment/lithology: fluvial-lacustrine; limestone and marl
•Packages P12/141 - P13/147 Interval 76.05-81.60m Thickness (observable) 5.55m
•Limestone and marl with subordinate interbeds of shale and siltstone. Limestones: light- and dark-grey, hard, solid, algal-microbial, riddles with numerous voids of plant roots in situ. Marls: grey, pinkish, and violet. Siltstones: bright red, brown, grey, indistinctly bedded, with calcareous nodules. Rocks contain scattered ostracods and charophytes.
•[Severodvinian Regional Stage]
•Packages P13/148 Interval 81.60-82.10m Thickness (visible) 0.50m
•Shale and sandstone. Shale: reddish-brown, indistinctly bedded with numerous slickensides. Sandstone: yellowish-grey, fine-grained, polymict with gently oblique bedding. The contact with the underlying bed is uneven." (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 197592: authorized by Alex Dunhill, entered by Bethany Allen on 17.11.2018
Creative Commons license: CC BY (attribution)
Taxonomic list
| unclassified | |
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| Cuneatochara | |
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| Ostracoda | |
Prasuchonella nasalis, Prasuchonella stelmachovi, Suchonellina inornata, Paleodarwinula fragiliformis, Paleodarwinula elongata, Paleodarwinula torensis, Paleodarwinula chramovi
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