Lava River canyon, Bed 32 Upper (Ordovician of Russian Federation)

Where: St. Petersburg, Russian Federation (59.9° N, 31.6° E: paleocoordinates 35.8° S, 1.4° E)

• coordinate stated in text

• outcrop-level geographic resolution

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

• ~ 10 cm below Asaphus expansus / Asaphus raniceps boundary.

• bed-level stratigraphic resolution

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 191353: authorized by Björn Kröger, entered by Björn Kröger on 23.01.2018, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

 Billingsellida - Gonambonitidae
Gonambonites sp. Pander 1830
 Billingsellida - Clitambonitidae
 Strophomenida - Plectambonitidae
Ingria sp. Öpik 1930
 Strophomenida - Taffiidae
Inversella sp. Opik 1933
Ukoa ornata Öpik 1932
 Orthida - Lycophoriidae
Lycophoria sp. Lahusen 1885