NJG80-4-04
2000
Clitambonitoid brachiopods from the Middle and Upper Ordovician of the Oslo Region, Norway
80
4
pp. 275-288

Nine species of clitambonitoid brachiopods have been described from the Middle and Upper Ordovician of the Oslo Region, Norway. They include, Hemipronites? sp., Clitambonites schmidti, Clinambon anomalus, Ilmarinia dimorpha, Vellamo oandoensis, Kullervo hibernica, Kullervo aff. parva, Kullervo aff. punctata and Kullarvo cf. lacunata. The palaeobiogeography and palaeoecology of the Upper Ordovician clitambonitoid brachiopods are discussed. The species found in the northern and western parts of the Oslo Region are mostly related to those of the Baltic carbonate platform, despite surprisingly large differences in lithology. The foreland basin (the Oslo-Scania confacies belt of Jaanusson & Bergstrøm, 1980) has a different fauna, dominated by pandemic species of Kullervo. This genus is supposed to have developed in parallel in Avalonia (pandemic species and the North American species) and Baltica (all endemic species to Baltica), from an early kullervo of either Baltic or Avalonian origin. The rapid spread of the genus in the North Atlantic area is linked -in time - to the large bentonite in the Middle Caradocian.

Olev Vinn, Institute of Geology, University of Tartu, Vanemuise 46, 50090 Tartu, Estonia (e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.);
Nils Spjeldnæs, Department of Geology, University of Oslo, P.O. Box 1047, Blindern, N-0316 Oslo, Norway (e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.)

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0029-196X
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