Late Weichselian glacial stratigraphy in the Brorfelde area, Denmark, based on statistical analysis of different till parameters

Abstract

Abstract Thick glacifluvial sediments in the Brorfelde area, northwestern Sjaelland, are covered by a visually uniform till material. The till stratigraphic studies using i.a. till fabrics and fold analyses reveal evidence of two ‘Young Baltic’ ice advances correlated with the ‘Belt Sea’ advance and the readvance of the ‘Belt Sea’ ice. At the Brorfelde hills these two ice advances came from the S to ESE and the SW respectively. Statistical analyses of stone countings, grain-size distributions, CaCO3 analyses and till fabrics enable a separation of the seemingly uniform till material into three till units. Two of the units were most probably deposited during the ‘Belt Sea’ advance. The youngest till, deposited during the readvance of the ‘Belt Sea’ ice, is characterized by a high content of Palaeozoic limestone. The deposition of till material during the ice advance from the S to ESE is greater than indicated by the till fabrics. Prior to the statistical treatment of the lithostratigraphical data it was thought to be impossible to separate the till material into different units, corresponding to the two ice advances.