Where: Oslo-Asker, Norway (59.9° N, 10.7° E: paleocoordinates 31.7° S, 9.6° W)

• coordinate estimated from map

When: Diplograptus foliaceus graptolite zone, Arnestad Formation, Haljala to Haljala (460.9 - 455.8 Ma)

• "Lower Chasmops Shale 4bα ", in Nikolaisen (1961)= Arnestad

• formation-level stratigraphic resolution

Environment/lithology: marine; shale

Size classes: macrofossils, mesofossils

Primary reference: F. Nikolaisen. 1961. The Middle Ordovician of the Oslo Region, Norway 7. Trilobites of the suborder Cheirurina. Norsk Geologisk Tidsskrift 41:279-310 [B. Kröger/B. Kröger]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 191108: authorized by Björn Kröger, entered by Björn Kröger on 10.01.2018

Creative Commons license: CC BY (attribution)