The Miocene Hagenør-Børup sequence at Lillebælt (Denmark): its biogenic structures and depositional environment

The paper presents the results of chemical, mineralogical and trace-fossil analyses of the lower Miocene sequence exposed at Hagenør and Brørup at the Lillebælt Coast in southern Jylland, Denmark. The section comprises a 20 m thick series of clastic deposits that is subdivided into 6 units that vary in lithology and sedimentary structures, both physical and biogenic. The major biogenic structures are burrows that are attributable to the life activity of sea anemones, polychaetes, echiuroids, ?haustoriid amphipods, callianassid decapods, gastropods, pelecypods, holothurians and echinoids. The investigated ichnocoenose reflects a diversified pattern of bottom consistency and hydrodynamic conditions that prevailed in the eastern part of the Miocene North Sea. The sedimentary environment in this area was highly comparable to that of some regions of the present-day North Sea.