4. Rockslide moraine (250 m.a.s.l.)

This bouldery deposit appears strange. The boulders consist of gabbro, which is not found otherwise in this part of the valley. The deposit probably formed as a rock avalanche that fell onto the glacier further upvalley at a time when Steindalsbreen filled the whole valley. The glacier then transported the boulders down the valley and dumped them here when the glacier melted. This happened at the end of the ice age, about 10,000 years ago. The bouldery deposit forms a special type of glacial deposit that we may term a ‘rockslide moraine’.

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