The North Sea Basin: Early Paleocene (Danian)
The lower and upper boundaries of this interval correspond to the boundaries of the Danian. The basal surface is everywhere well defined, and through much of the basin is apparently conformable (at the level of biostratigraphic resolution) or a minor disconformity, except in areas subject to halotectonics. High-resolution biostratigraphic data at this level is, however, very limited. In Denmark, where high-resolution biostratigraphy is available, both conformable and disconformable contacts have been identified. Towards the basin margins, and over some structural features, the basal contact develops into a major unconformity in some areas. The boundary is sharply defined biostratigraphically, marked by the major biotic turnover at the Cretaceous-Tertiary (K-T) boundary.