Stratigraphic and geographic position of localities. A Stratigraphic position of the studied localities shown in relation to the global marine oxygen isotope record (MIS), NW European glacial stages, and the NGRIP δ18O record. Correlation of regional stratigraphic units with MIS follows the global marine isotope framework (Bassinot et al. 1994; Lisiecki and Raymo 2005) and its calibration against Greenland ice-core records and NW European stratigraphy (NGRIP Members 2004; Andersen et al. 2007). B Geographic position: studied localities are indicated by a red circle, other localities discussed in the paper are indicated by a blue hollow circle.