Clipping (and translation) form the introduction to Magazin for Naturvidensaberne in 1823, where B. M. Keilhau gave the first geological report from Jotunheimen (Keilhau, 1823). *Keilhau named the mountains Jotunfjelde (meaning giant-mountains). The poet Aa O. Vinje gave the modern name, Jotunheimen, in 1862 (Thorsnaes, 2009).
International audienceTwo lacustrine sediment cores from Oldevatnet in western Norway have been studied in order to produce a record of floods, mass-wasting events and glacier fluctuations during the last 7300 years. River floods, density currents and snow-avalanches have deposited distinct 'event layers' at the lake floor throughout this time interval. In this study, a novel approach has been applied to distinguish event layers from the continuous background sedimentation, using Rb/Sr-ratios from X-Ray Fluorescence data. Grain-size distribution and the sedimentological parameters 'mean' and 'sorting' were used to further infer the depositional processes behind each layer. Our data suggest a record dominated by snow-avalanches, with the largest activity occurring during the 'Little Ice Age' (LIA). This increase in snow-avalanche activity observed during the LIA was probably caused by a combination of generally increasing winter precipitation and the advance of local glaciers towards the steep valley sides. Several fluctuations in snow-avalanche activity are also recognized prior to the LIA. Proxies of glacial activity from the background sediments indicate a similar development as earlier palaeoclimatic reconstructions from the area. It differs from previous reconstructions, however, by suggesting a lower glacial activity in the period from 2200 to 1000 cal. yr BP
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