Lava River canyon, Bed 31 (Ordovician of Russian Federation)

Where: St. Petersburg, Russian Federation (60.0° N, 32.6° E: paleocoordinates 35.6° S, 1.9° E)

• coordinate estimated from map

When: Asaphus expansus trilobite zone, Nikolskoe Member (Sillaoru Formation), Kunda (468.1 - 463.5 Ma)

Environment/lithology: marine; calcareous claystone and ooidal, argillaceous limestone

• "The Sillaoru Formation is about 85 cm thick, the Nikolskoe Member constituting some 65 cm of the formation. Furthermore, here, both the base and the top of the member are marked by purple phosphatized hardground surfaces.

•It consists of calcareous clay with highly argillaceous limestone with numerous iron ooliths. The carbonates are heavily bioturbated, penetrated often by Skolithos burrows together with Trypanites type borings.", in Rasmussen & Harper (2008)

Size classes: macrofossils, mesofossils

Primary reference: C. M. O. Rasmussen and D. A. T. Harper. 2008. Resolving early Mid-Ordovician (Kundan) bioevents in the East Baltic based on brachiopods. Geobios 41:533-542 [B. Kröger/B. Kröger]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 191351: authorized by Björn Kröger, entered by Björn Kröger on 23.01.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

Strophomenata
 Strophomenida - Grorudiidae
Calyptolepta sp. Neuman 1976
Rhynchonellata
 Pentamerida -
Syntrophiidina indet. Ulrich and Cooper 1936
 Orthida - Orthidae
Orthis callactis Dalman 1827
 Orthida - Lycophoriidae
Lycophoria sp. Lahusen 1885
 Orthida - Productorthidae
Glossorthis sp. Öpik 1930