Østerdalen. Beskrivelse til kvartærgeologisk landgeneralkart

Abstract

The accompanying map covers a central area of eastern Norway, including the ice divide of the latest Ice Age. The intention, besides giving general quaternary features of the district, is to show the progressive wastage of the inland ice, which can be traced by establishing a sequence of outlets from glacier-dammed lakes. Moving glaciers have carried sparagmite drift in north-westerly direction, against the slope of the land, where it rests on schists belonging to the Trondheim Region series. Erratics of Pre-Cambrian granites and gabbros from the district between Atnedalen valley and Glåmdalen valley are spread towards the west and north-west. The last ice divide was situated just north of Otnes, in the Ytre Rendal. Near the ice divide, striae are seldom visible. Vanished glacier-lakes indicate that the last remnants of the ice-cap dammed the Femund Basin (including lakes Femund, Isteren and Sjølensjø), and also the Rendalen valley north of Storsjøen lake, and the Glåmdalen valley north of Koppang. On the highest mountains block-fields are abundant, as compared with morainic cover.