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Medientyp:
E-Artikel
Titel:
The Boulder Fields of Mt. Fulufjället, West-Central Sweden -Late Weichselian Boulder Blankets and Interstadial Periglacial Phenomena
Beteiligte:
Kleman, Johan;
Borgström, Ingmar
Erschienen:
Swedish Society for Anthropology and Geography, 1990
Erschienen in:Geografiska Annaler. Series A, Physical Geography
Sprache:
Englisch
ISSN:
0435-3676;
1468-0459
Entstehung:
Anmerkungen:
Beschreibung:
<p> Detailed morphological analysis of the boulder fields on the Mt. Fulufjället 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 depressions and the associated patterned ground were in existence before the last overriding ice sheet, and consequetly are of a pre-Late Weichselian age. The material found in the glacially transported boulder blankets is shown mainly to be derived from boulder depressions. Drawn-out "tails" from boulder depressions are interpreted to be related to lateral shear zones between cold- and warm based zones of the ice sheet. No large-scale periglacial forms appear to have developed on the plateau during the Holocene. An area of more than 60 km<sup>2</sup>of an interstadial periglacial landscape has survived virtually unchanged despite complete ice cover during the late Weichselian. </p>