Upper Ordovician bivalves from the Oslo Region, Norway
This study deals with Upper Ordovician bivalves (Tretaspis series, stages 4c- 5b, Upper Caradocian and Ashgillian) of the Oslo Region. Most of the fossils are poorly preserved or incomplete. Twenty-eight species and fifteen genera are identified and compared with previously described species from other regions. The specimens are not systematically collected, but are sampled from different districts.