About 3,000 specimens have been studied from the Chasmops Series in the Central Oslo Region (Oslo-Asker, Ringerike districts). The presenceof conodonts in the Ogygiocaris Shale (4a?3) is reported. A new genus, Eoplacognathus, and 13 new species are described. Similarities between the European (Scotland, Sweden, Central Oslo Region) Caradoc and the North American midcontinent Upper Ordovician conodont facies are discussed. A preliminary account of the stratigraphical succession of conodonts from the Central Oslo Region is given.
The Middle Ordovician of the Oslo Region, Norway. 22. Preliminary report on conodonts from the Oslo-Asker and Ringerike districts.