Odgaard, Bent Vad3; Krohn, Charlotte Fog1; Kronborg, Christian3; Nielsen, Ole Bjørslev3
1 Department of Earth Sciences, Faculty of Science, Aarhus University, Aarhus University2 Department of Geoscience, Science and Technology, Aarhus University3 Department of Geoscience, Science and Technology, Aarhus University
Reconnaissance corings prior to road constructions South of Herning, western Jutland revealed the presence of an extensive interglacial lacustrine deposit which in 2004 was exposed in open sections at the fringes of the former basin. Samples from marginal exposures were searched for plant and animal macrofossils and two cores were secured from the central part of the basin where the lacustrine deposits have a thickness of about 15 m. The stratigraphy of the deposit can be subdivided into unit A: a lake marl (4 m) superimposed by 3 metres of diatomite and sealed by a thin diamicton. On top of unit A follows unit B: 4 metres of gyttja, calcareous at the basal part and sealed by 40 cm of clay. Finally unit C on top of unit B is represented by 1.5 metres of gyttja. The pollen record of unit A can be correlated to the classical Danish record from the nearby Harreskov site (Andersen 1965) and also to the lacustrine record from the North German site of Hunteburg (Hahne et al. 1994) and the lower part of the Polish pollen record of Ferdinandow (Zagwijn 1996). Experimental OSL datings using feldspar grains retrieved from unit A gave ages of 512 ± 36 ka and 539 ± 45 ka. Units B and C would traditionally be interpreted as interstadials of the early part of the Elsterian glaciation, the so-called Ølgod I and Ølgod II (Andersen 1965). However, experimental OSL datings (feldspar) of these units gave ages of 229±12 ka and 284±15 ka respectively and the status of these units remain uncertain. Unit B may possibly represent an interglacial period so far not recognised from the Danish area. References Andersen, S.T. 1965. Meddr. Dansk Geol. Foren, 15: 486-506. Hahne, J., H. Mengeling, J. Merkt and F. Gramann, 1994: Geologisches Jahrbuch A134: 117-166. Zagwijn, W. 1996. in Turner, C. (ed). The early Middle Pleistocene of Europe: 145-172.
28th Nordic Geological Winter Meeting, January 7-10, 2008, Aalborg, Denmark. Abstract Volume, 2008, p. 17-17