A 3.2 m deep section 495 m.a.s.l. in Frudalen, a western tributary to Sogndalsdalen, inner Sogn, shows alternating layers of debris and peat. Except for the basal diamicton, interpreted as a till deposited during the early Holocene deglaciation of the continental ice sheet, the minerogenic horizons are interpreted as having been deposited during periods of enhanced avalanche activity. One radiocarbon date from a broken birch (Betula sp.) log and six peat dates show that four periods of pronounced avalanche activity occurred between 580 ± 60 BP (AD 1310-1420) and 3920 ± 70 BP (2340-2490 BC). The stratigraphic record is well correlated with avalanche activity in the Sunnmøre area and with the record of glacier fluctuations in western Norway.
A. Nesje, Department of Geography, University of Bergen, Breiviken 2, N-5035 Bergen-Sandviken, Norway;
A. R. A.a & E. Sønstegaard, Sogn og Fjordane distriktshøgskule, P.O. Box 39, N-5801 Sogndal, Norway;
M. Kvamme, Botanical lnstitute, University of Bergen, A/legt. 41, N-5007 Bergen, Norway.