The Danian- Selandian boundary at Svejstrup with remarks on the biostratigraphy of the boundary in western Denmark.

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 Selandian 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 Hvallose, the time interval included in the hiatus at Svejstrup is greater than at Hvallose. 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. Two new species of dinoflagellates from the Paleocene are described. -from Authors