Abstract
The Danian-Selandian boundary at Svejstrup is characterized by an abrupt facies change from a pure limestone to a terrigeneous marl. The top of the Danian limestone is an intensively burrowed abrasion surface. The Sel:indian deposits are initiated by a conglomerate of glauconitized and phosphatized limestone pebbles. Although the boundary at Svejstrup is very similar to the nearby section at Hvalklse, the time interval included in the hiatus at Svejstrup is greater than at Hvall0se. The coccoliths and dinoflagellates indicate different ages for the top of the Danian. It is also shown that the Danian sequences in the Harre and the Viborg 1 borings include strata younger than in any previously described Danian sections. At both of these localities a number of coccoliths and a dinoflagellate, Spinidinium densispinatum, hitherto only recorded from the Selandian, occur in the Danian limestone. The top of the Danian at Harre and Viborg 1 is of upper NP4 or lower NP5 age. The calcareous nannofossils of the lower Selandian are completely dominated by reworked Cretaceous forms, whereas reworked dinoflagellates are extremely rare. This difference is probably due to oxidation of the Cretaceous dinoflagellates during reworking. Two new species of dinoflagellates from the Paleocene are described.
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