1. Geological Survey of Denmark & Greenland (GEUS), Department of Quaternary Geology, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark; Department of Geography, Loughborough University, Loughborough LE11 3TU, UK;
2. Geological Survey of Denmark & Greenland (GEUS), Department of Quaternary Geology, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
3. Department of Phycology, Botanical Institute, University of Copenhagen, Oster Farimagsgade 2 D, DK-1353 Copenhagen K, Denmark
4. Department of Geography, Loughborough University, Loughborough LEI11 3TU, UK