K4, Pechishchi Village, Volga River: Wordian, Russian Federation

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Ostracoda
Ostracoda indet. Latreille 1802
Unit K4/8
Strophomenata - Productida - Linoproductidae
Cancrinella cancrini (de Verneuil 1845)
Unit K4/4, K4/5, K4/6, K4/7, K4/8
Strophomenata - Productida - Aulostegidae
Aulosteges fragilis (Netschajew 1894)
Unit K4/4-1, K4/7
Rhynchonellata - Rhynchonellida - Rhynchoporidae
Rhynchopora geinitziana (de Verneuil 1845)
Unit K4/5
Rhynchonellata - Rhynchonellida - Stenoscismatidae
Stenoscisma sp. Conrad 1839
Unit K4/7
Rhynchonellata - Athyridida - Athyrididae
Cleiothyridina pectinifera (Sowerby 1841)
Unit K4/5
Rhynchonellata - Spiriferida - Ambocoeliidae
Crurithyris sp. George 1931
Unit K4/7
unclassified
Bryozoa indet. (Ehrenberg 1831)
Unit K4/7
Bivalvia
Bivalvia indet. Linnaeus 1758
Unit K4/7
Crinoidea
Crinoidea indet. Miller 1821
Unit K4/8
Conodonta - Ozarkodinida - Ellisoniidae
Stepanovites meyeni
Unit K4/8
unclassified
Charophyta indet. Migula 1890
Unit K4/6, K4/8
Planolites sp. Nicholson 1873
Unit K4/6
see common names

Geography
Country:Russian Federation
Coordinates: 55.8° North, 48.9° East (view map)
Paleocoordinates:28.3° North, 42.8° East
Basis of coordinate:stated in text
Geographic resolution:outcrop
Time
Period:Permian Epoch:Guadalupian
Stage:Wordian 10 m.y. bin:Permian 4
Key time interval:Wordian
Age range of interval:266.90000 - 264.28000 m.y. ago
Stratigraphy
Geological group:Kazan Formation:Prikazan Member:Yadrenyi Kamen
Stratigraphy comments: Upper Kazanian beds, numbered K4/1 - K4/8 from bottom to top (Nurgaliev et al. 2015)
"The base of the Upper Kazanian Substage, as defined by Noinsky (1899, 1924), is exposed 1.0m above the river level and 54.0m ASL." (Nurgaliev et al. 2015)
Lithology and environment
Primary lithology: dolomite
Lithology description: "Unit K4/1 Interval 1.80-1.95m Thickness (visible) 0.15m Bed no. 1, Chervotochina ('Worm-holes') of Noinsky (1899, 1924) Dolostone: tan, argillaceous, soft, with vermiform voids/channels. Unit K4/2 Interval 1.95-4.20m Thickness 2.25m Bed no. 2, Yadrenye Porogi ('Solid Thresholds') of Noinsky (1899, 1924) Dolostone: pale grey, weathers yellowish, calcareous, thick-bedded, tight and hard. Samples show bioclastic mudstone texture with predominantly horizontal to random orientation of bioclasts. Thin (<1mm) curved channels are observed at 1.55m. Fine poorly preserved plant detritus may be present. Observation on fossils and caverns similar to outcrop K3 [Collection no. 197534]. The unit consists of seven parts: Bed K4/2-1 Interval 1.95-2.45m [0.00-0.50] Thickness 0.50m Dolostone: pale grey, weathers yellowish, massive, hard, tight. An interval of vuggy dolostone (0.05-0.10m) 0.25m above the base. The vugs are irregular, 2-5cm in size, interpreted as anhydrite solution voids. No fossils. Bed K4/2-2 Interval 2.45-2.55m [0.50-0.60] Thickness 0.10m Dolostone: finely crystalline, microporous, fissile, locally preserving non-disturbed bioclast micro-pavements. No fossils. Bed K4/2-3 Interval 2.55-2.85m [0.60-0.90] Thickness 0.30m Dolostone: finely crystalline, tight, massive, with thin (<5mm in diameter) upright channels penetrating from top, showing spongy internal structure ad bleached haloes. The top of this subunit is undulating, erosional, with pockets up to 3cm deep. Bed K4/2-4 Interval 2.85-3.05m [0.90-1.10] Thickness 0.20m Dolostone: grey, calcerous, with granular bioclastic texture (grainstone?) hosting numerous hollow biomoulds of brachiopods and molluscs. Thickness changes laterally from 0.10 to 0.20m. Bed K4/2-5 Interval 3.05-3.45m [1.10-1.50] Thickness 0.40m Dolostone: yellowish grey, calcareous, massive, tight, and hard. Upright indistinctly branching solution channels of 1-2cm in diameter are developed from top, interpreted as solution-enlarged burrows. Bed K4/2-6 Interval 3.45-3.55m [1.50-1.60] Thickness 0.10m Dolostone: pale grey, bedded cavernous, with brachiopod bioclasts. Bed K4/2-7 Interval 3.55-4.20m [1.60-2.25] Thickness 0.65m Dolostone: pale grey, of medium hardness, probably with partly preserved primary lamination; distinct rectangular jointing with conchoid fracturing. This thick-blocky jointing makes it different from thinner bedded underlying units. Unit K4/3 Interval 4.20-4.80m Thickness 0.60m Bed no. 3, Zheltaya Plita ('Yellow Plate') of Noinsky (1899, 1924) Dolostone: pale grey, weathers yellowish, indistinctly bedded, massive, of medium hardness. The unit is composed of three parts: Bed K4/3-1 Interval 4.20-4.40m [0.00-0.20] Thickness 0.20m Dolostone: thin bedded (1 to 5cm in thickness), relatively soft, massive, with bioturbated bioclastic wackestone texture (bioclasts include brachiopods and bivalves). Bed K4/3-2 Interval 4.40-4.60m [0.20-0.40] Thickness 0.20m Dolostone: with distinct bioclastic texture (packstone), vuggy, locally preserving subhorizontal wavy lamination with shell pavements. Predominant horizontal orientation of bioclasts defines lamination. Some bedding planes show mass charophyte stalks. Base likely erosional. Bed K4/3-3 Interval 4.60-4.80m [0.40-0.60] Thickness 0.20m Dolostone: relatively soft, fissile, with bioclastic mudstone-wackestone texture. Predominant horizontal orientation of bioclasts. Top erosional. Unit 4/4 Interval 4.80-5.50m Thickness 0.70m Bed no. 4, Zvonkaya Plita ('Ringing Plate') of Noinsky (1899, 1924) Dolostone: pale grey, hard and tight, locally vuggy, with rare Cancrinella. The unit can be divided into two parts: Bed K4/4-1 Interval 4.80-5.10m [0.00-0.30] Thickness 0.30m Dolostone: locally vuggy, retains bioclastic texture (packstone?) and lenticular lamination with shell pavements (including fragments and whole valves of Aulosteges. Base is possibly erosional. Laterally this bed obtains fissility, which is likely attributed to weathering (solution) processes. Bed K4/4-2 Interval 5.10-5.50m [0.30-0.70] Thickness 0.40m Dolostone: fissile to thin-bedded, retaining bioclastic wackestone texture and wavy lamination. *The interval of beds K4/3-K4/4 preserves the rhythmic tempestite bedding with normally graded beds composed of basal shell coquinas (rudstones) and overlying wackestones and packstones. In basal coquinas, shells imbricate and occur predominantly convex-side up. Unit K4/5 Interval 5.50-7.00m Thickness 1.50m Bed no. 5, Yadrenyi Rubets of Yadrenyi Kamen ('Solid Seam' or 'Solid Rock') of Noinsky (1899, 1924) Dolostone: very similar to K3/5. Massive to weakly laminated bioclastic wackestone with rare in situ brachiopods. At the top, the rock is vuggy and locally thin-bedded. The unit stands out in the outcrop due to its monolithic appearance. Unit K4/6 Interval 7.00-7.60m Thickness 0.60m Bed no. 6, Solyanoi Rubets ('Salt Seam') of Noinsky (1899, 1934) Dolostone: yellowish grey. fissile to thin-bedded, with finely to microcrystalline fabric (5-50um), microporous, locally vuggy, relatively soft. Moderately bioturbated to laminated bioclastic packstone and wackestone. Bedding / fissility planes show laminae enriched in charophyte stalks and laminae dominated by brachiopod fragments. Some brachiopods are preserved in life position (Cancrinella). Brachiopod coquinas (storm beds) at 0.20m, 0.30m and 0.40m above the base. These coquinas are disrupted by burrowing. Some bedding planes show darker coloured gently plunging and randomly curved burrows identified as Planolites. Unit K4/7 Interval 7.60-7.90m Thickness 0.30m Bed no. 7, Tolstyi Stul Siney Plity ('Thick Chair of the Blue Plate') of Noinsky (1899, 1924) Dolostone: calcareous, moderately argillaceous, yellowish grey with bluish mottles, fine-grained, rich in void-filling bluish large celestine crystals. Laterally grading into grey coloured recessive fissile calcareous marl. The marl facies contain cm-think resistant limestone beds and lenses with shell coquinas and erosional surfaces indicative of tempestite rhythmicity. Macrofossils are bivalves, brachiopods and branching bryozoans. Unit K4/8 Interval 7.90-8.30m Thickness 0.40m Bed no.8, Sinyaya Plita ('Blue Plate') of Noinsky (1899, 1924) Dolostone to limestone: bluish grey, fine-grained, weathering rusty. The lower part is hard and monolithic, locally composed of weakly fissile bluish grey limestone. This limestone shows low-contrast sedimentary rhythmicity (bioclastic-micritic graded beds). The upper part is more argillaceous and slightly more recessive. Fossils include ostracods, fragmented brachiopods, crinoid ossicles, ichthyolites, charophyte remains." (Nurgaliev et al. 2015)
Environment:marine indet.
Taphonomy
Modes of preservation:body,mold/impression
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Metadata
Database number:197535
Authorizer:A. Dunhill Enterer:B. Allen
Modifier:B. Allen
Created:2018-11-15 10:22:47 Last modified:2020-03-20 09:31:08
Access level:the public Released:2018-11-15 10:22:47
Creative Commons license:CC BY
Reference information

Primary reference:
67364. 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]