Kråkeholmen, 4d (Ordovician of Norway)
Where: Oslo-Asker, Norway (59.9° N, 10.6° E: paleocoordinates 29.3° S, 9.1° W)
• coordinate estimated from map
When: Skogerholmen Formation, Pirgu (449.5 - 445.2 Ma)
• "4d α-γ", in Henningsmoen, 1953
• formation-level stratigraphic resolution
Environment/lithology: marine; limestone and shale
• In the type area, the base of this formation marks an abrupt change from a shale dominated succession to rubbly limestones up to 10cm thick passing upwards into nodular limestones (up to 10cm) and shales (up to 35cm). The rubbly limestone is not developed in Ringerike. The uppermost 2 3m of the formation comprises bedded limestones (5 10cm) and shales (5 30cm)
Size classes: macrofossils, mesofossils
Primary reference: G. Henningsmoen. 1953. Upper Ordovician Ostracods from the Oslo region, Norway. Norsk Geologisk Tidsskrift 33(8):69-108 [B. Kröger/B. Kröger]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 190057: authorized by Björn Kröger, entered by Björn Kröger on 27.11.2017
Creative Commons license: CC BY (attribution)
Taxonomic list
Show authors, comments, and common names
Ostracoda | |
Opikella umbilicata Kummerow 1924 ostracod |