Where: Ringerike, Norway (60.1° N, 10.2° E: paleocoordinates 32.4° S, 10.2° W)

• coordinate estimated from map

When: Arnestad Formation, Idavere to Idavere (458.0 - 453.0 Ma)

• "Lower Chasmops shale"

Environment/lithology: marine; shale

Size classes: macrofossils, mesofossils

Primary reference: W. C. Sweet. 1958. The middle ordovician of the Oslo region, Norway 10. Nautiloid Cephalopods. Norsk Geologisk Tidsskrift 38:1-178 [B. Kröger/B. Kröger/B. Kröger]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 164007: authorized by Björn Kröger, entered by Björn Kröger on 23.11.2014

Creative Commons license: CC BY (attribution)