Callovian-Volgian dinocyst stratigraphy of the Central Trough in the Danish North Sea Area

Abstract

The Danish North Sea wells U-1 and E-1 have been dated on the basis of dinocysts and correlated with the established ammonite stratigraphy of Western Europe. The palynostratigraphy of the U-1 well shows that the age of the Jurassic lithostratigraphic units is of Callovian to Kimmeridgian age. In the E-1 well, only the upper part of the Farsund Formation (of Jensen et al., 1986) has been penetrated. The age of this part is of Ryazanian to Volgian age. The four new formations (Lower Graben Sand Formation, Middle Graben Shale Formation, Lola Formation and Farsund Formation (of Jensen et al., 1986) show a marked difference in organic facies. It seems possible to relate these differences in organic facies to sea-level chan­ges.