PBDB Collection

Oandu, North Estonia, Hirmuse Fm (Ordovician of Estonia)

Where: Estonia (59.6° N, 26.1° E: paleocoordinates 29.2° S, 0.4° W)

• coordinate estimated from map

When: Late/Upper Ordovician (458.4 - 443.8 Ma)

• Oandu Stage

•The Hirmuse Formation is slightly younger than the Vasalemma Formation

• formation-level stratigraphic resolution

Environment/lithology: shallow subtidal; marl

• Th beds of the Hirmuse Formation formed in the shallow-marine part of a more or less restricted shelf area affected by changing sea levels.

• The Hirmuse Formation consists of marl with clay and fine-silt fractions and contains a rich fauna of brachiopods, bryozoans and rugose corals.

Size class: macrofossils

Preservation: original calcite

Primary reference: M. Mõtus and Y. Zaika. 2012. The oldest heliolitids from the early Katian of the East Baltic region. GFF A Scandinavian Journal of Earth Sciences 134(3):225-234 [E. Kido/E. Kido]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 144637: authorized by Erika Kido, entered by Erika Kido on 14.05.2013, edited by Björn Kröger

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Strophomenata
Strophomenida - Rafinesquinidae	Oandumena fluviatilis², Rakverina oanduensis¹, Kjaerina poljensis¹, Kjaerina orvikui¹ Oandumena fluviatilis² Oraspold 1956 Rakverina oanduensis¹ Oraspold 1956 Kjaerina poljensis¹ Alichova 1951 Kjaerina orvikui¹ Oraspold 1956
Rhynchonellata
Orthida - Platystrophiidae	Platystrophia crassoplicata³ Platystrophia crassoplicata³ Alichova 1951
Anthozoa
Heliolitida - Coccoserididae	Protaraea diffluens Protaraea diffluens Eichwald 1854 tabulate coral

¹Roomusoks 1993; ²Roomusoks 2004; ³Zuykov and Harper 2007