Summary
The superficial deposits within the area of map-sheet Siljan, southeastern Norway, are classified and described. Most of the hilly areas are dominated by exposed bedrock or a thin and discontinuous cover of till. In the main valleys, beow the marine limit (c. 160-180 m a.s.l.), fine-grained marine sediments and fluvial deposits dominate. Glaciofluvial deposits exist in Siljandalen and Lågendalen as well as in the tributary valley Hærlandsdalen. Ice movements and the course of deglaciation are reconstructed. The oldest ice movements were towards the south, later turning towards SSE and SE. Features associated with gacial events marking small advances or halts of the ice-front during the deglaciation in late Younger Dryas and early Preboreal time have been detected within map-area. The Geiteryggen Ice-marginal deposits are correlated with the Ski Ice-marginal deposits in the Oslofjord region and dated to c. 10 000 years B.P. The mapped area was ice-free 9,850-9,800 years B.P. Short accounts are given on shorelines and shore-level displacement. The potential for different utilization of the superficial deposits is also briefly discussed.
