Four shallow cores drilled on an E-W trending seismic line on the Trøndelag Platform 35-40 km to the west of Vega, Helgeland, Norway are described and their dinoflagellate cysts, ammonites and bivalves studied. Two new dinoflagellate cyst species, Crussolia perireticulata and Glomodinium cerebraloides, are formally described, and one new combination, Glomodinium granulatum (Pocock) n. comb., is proposed. Ammonites and bivalves of the genera Pseudocadoceras, Longaeviceras, Amoeboceras, Praebuchia and Buchia are systematically described and figured. The recorded fossils are used for a biostratigraphical interpretation. The cores represent parts of the Callovian and a nearly complete Oxfordian section. Lowermost Kimmeridgian strata are also represented.
Biostratigraphy of some Callovian and Oxfordian cores off Vega, Helgeland, Norway