Lava River canyon, Bed 30 A (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 (469.2 - 464.3 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 191349: authorized by Björn Kröger, entered by Björn Kröger on 23.01.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Strophomenata
 Strophomenida - Taffiidae
Ahtiella sp., Inversella sp.
Ahtiella sp. Öpik 1932
Inversella sp. Opik 1933
 Billingsellida - Gonambonitidae
Gonambonites sp.
Gonambonites sp. Pander 1830
 Billingsellida - Clitambonitidae
Hemipronites imbricata
Rhynchonellata
 Orthida - Paurorthidae
Paurorthis parva
Paurorthis parva Pander 1830
 Orthida - Orthidae
Orthis callactis
Orthis callactis Dalman 1827