THE BOULDER FIELDS OF MT FULUFJALLET, WEST-CENTRAL SWEDEN - LATE WEICHSELIAN BOULDER BLANKETS AND INTERSTADIAL PERIGLACIAL PHENOMENA

Detailed morphological analysis of the boulder fields on the Mt. Fulufjallet plateau has revealed three morphologically and genetically different boulder field types; 1) boulder depressions related to upfreezing in till, 2) boulder blankets, i.e. glacially transported boulder masses, and 3) frost-shattered debris in situ. Two distinctly different landscape types are related to the boulder fields of type 1 and 2. At the border between landscape types it can be shown that the boulder depression and the association patterned ground were in existence before the last overriding ice sheet, and consequently are of a pre-Late Weichselian age. An area of more than 60 km2 of an interstadial periglacial landscape has survived virtually unchanged despite complete ice cover during the late Weichselian. -from Authors