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Interglacial deposits in Denmark have traditionally been referred to the Cromerian complex (Hareskovian), Holsteinian or Eemian stages. However, based on studies of sediment cores from the deep sea many more than three Quaternary interglacials have been documented, and in other parts of north-western Europe it is becoming increasingly clear that the on-shore Quaternary sequences are much more complex than previously believed. Interglacial deposits are characterised by plant and animal remains indicating longer periods with climatic conditions similar to or warmer than today, whereas interstadial deposits were formed during shorter time spans and usually contain remains of relatively coldadapted, arctic or sub-arctic species. Interglacial and interstadial deposits can be dated more or less precisely, and thus provide information about the relative age of glacial deposits. In 2010 the Geological Survey of Denmark and Greenland (GEUS) described samples from a 75 m deep borehole at 55°45.37´N, 12°19.63´E (elevation 20.7 m a.s.l.), at the address Bakketoften 50 in Malov on north-eastern Sjaelland (Fig. 1). Coring was conducted for Ballerup municipality (kommune) using the reverse circulation technique (‘omvendt skylning med lufthaevning’) by the well-drilling company Thomas Broker, and samples were collected every 2 m and sent to GEUS. A few shells of freshwater gastropods were noted, and since pre-Holocene shell-bearing deposits are rare on Sjaelland, we decided to analyse the macrofossil content. We initially assumed that the sediments were deposited in a lake during a Weichselian interstadial, because an interstadial deposit was reported from Malov by Frederiksen & Rosbirk (1999). However, we question this dating since Frederiksen and Rosbirk did not provide any data that could confirm an interstadial age or a lacustrine environment. This article gives details of macrofossil analyses of five samples from the borehole, which allow for more definite conclusions about the depositional environment of the site and its possible age.

A new Middle Pleistocene interglacial sequence from Måløv, Sjælland, Denmark