West of Billingstad, 4bα zone, Arnestad Fm. (Ordovician to of Norway)

Where: Asker, Norway (59.9° N, 10.5° E: paleocoordinates 31.8° S, 9.7° W)

• coordinate estimated from map

When: Arnestad Formation, Haljala to Haljala (456.8 - 453.0 Ma)

• " 4bα"= Arnestad Fm.

Environment/lithology: shale

Size classes: macrofossils, mesofossils

Primary reference: H. Soot-Ryen and T. Soot-Ryen. 1960. The Middle Ordovician of the Oslo region, Norway: 11, Pelecypoda. Norsk Geologisk Tidsskrift 40(2):81-122 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 194667: authorized by Björn Kröger, entered by Björn Kröger on 25.06.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Solemyida - Ctenodontidae
Ctenodonta sp. Salter 1852 clam
Strophomenata
 Strophomenida - Strophomenidae
"Strophomena (Gunnarella) alpha" = Gunnarella
"Strophomena (Gunnarella) alpha" = Gunnarella
 Strophomenida - Rafinesquinidae
Leptaena ennessbe Spjeldnaes 1957
 Strophomenida - Furcitellidae
Oslomena osloensis Spjeldnaes 1957
 Strophomenida - Aegiromenidae
 Strophomenida - Sowerbyellidae
"Ptychoglyptus valdari" = Ptychoglyptus irregularis Reed 1940
Eoplectodonta acuminata Holtedahl 1916
 Strophomenida - Christianiidae
Christiania holtedahli Spjeldnaes 1957