A sedimentary record from a deep Quaternary valley in the southern Lillebælt area, Denmark: Eemian and Early Weichselian lithology and chronology at Mommark

Abstract

Glaister, C. 2006 (May): A sedimentary record from a deep Quaternary valley in the southern Lillebaelt area, Denmark: Eemian and Early Weichselian lithology and chronology at Mommark. Boreas, Vol. 35, pp. 320 Á/331. Oslo. ISSN 0300-9483.A unique sequence of Late Saalian, Eemian and Early Weichselian strata is exposed in a coastal outcrop at Mommark in the western Baltic. The sedimentary facies and faunas reflect palaeoenvironmental changes from an initial freshwater lake followed by marine transgression and interglacial deposition in a palaeo-Baltic sea. The upper part of the Eemian marine record indicates regression followed by lacustrine sedimentation and deposition of Early Weichselian aeolian sediments, which are truncated by an erosional unconformity overlain by a till bed. The lower and middle parts of the sequence have previously been correlated with the European glacial Á/ interglacial stratigraphy on the basis of pollen analysis, while the upper part has been dated for the present study using optically stimulated luminescence (OSL) of samples from the aeolian and glacial deposits. A similar complete glacial Á/interglacial Á/glacial succession has not previously been recorded from this area. The Mommark sequence of conformable strata has been subjected to lateral compression, evidenced by folding and low-angle reverse faults. Seismic records from the adjacent waters in the western Baltic reveal a system of buried Quaternary valleys in the area. It is suggested that the interglacial deposition took place in a basin within one of these valleys and that a slab constituting the Mommark sequence, originating from the margin of a valley, has been glaciotectonically displaced northwestwards to the present location.

A multi‐proxy palaeoenvironmental and geochronological reconstruction of the Saalian‐Eemian‐Weichselian succession at Klein Klütz Höved, NE Germany

“…Similarly, there are only a few Eemian surface outcrops across this region, with the majority of the available information on last interglacial conditions derived from borehole data (Andr en et al 2011). Eemian exposures in Denmark are frequently part of glaciotectonically dislocated blocks (Larsen et al 2009), including the sites at Mommark (Eir ıksson et al 2006), Ristinge (Nielsen et al 2007) and Gammelmarke (Murray & Funder 2003). In NE Germany the situation is very similar, with most of the information obtained from borehole data (M€ uller 2004b;Meng et al 2009).…”