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Abstract
The Upper Jurassic-Lower Cretaceous Janusfjellet Formation, a ca. 400 m thick shaly unit, divisible into the Agardhfjellet and Rurikfjellet Members, has been studied in the field and by petrographical and geochemical means. The Bathonian-Kimmeridgian Agardhfjellet Member was deposited in an open shelf environment during a transgressive phase, and is characterized by more stagnant conditions than the Berriasian-Hauterivian Rurikfjellet Member. Total organic carbon values range from 1 to 4%, exhibiting a maximum of 12% in the Callovian paper shales. The Rurikfjellet Member, slightly enriched in volcanogenic components compared to the Agardhfjellet Member, displays regressive shelf sedimentation, ending in prodeltaic to deltafront depositional environments. Based on the sedimentpetrographical analyses, each member is divided into minor regressive and transgressive phases, probably reflecting tectonic activity and/or eustatic sea-level variations.
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