Isrand-dannelser ved Atnesjøen.
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Atnesjø is a lake in Central Norway, 700 m above sea level just to the SE of the Rondane mountain group. The Atnariver enters the lake from the north, and leaves at the north end, forming an affluent to the great Glomma river. At the end of the ice age, the climate in one period was so warm, that the higher hills melted out of the ice, while the glaciers were still filling up the valleys. To the south of the Atna lake, remnants of the inland ice still covered the plateau. The melt-water had to escape across the main divide to the north, and great lakes were dammed up in the upper parts of the valleys. From the Atne lake and valley, the melt-water found an outlet over a divide, 771 m above sea level, just to the west of Stodsby-øyen farm. Farther south, several gravel terraces were built up in marginal lakes, more or less connected. On the SW side of the lake, a terrace has been mapped in detail. Here a little river, S. Lauså, enters the lake from SW. The water volume has obviously once been much greater; the margin of the inland ice was situated at the head of this little \"Lauså-valley\", and sent a large river through a rocky channel and down the rather wide valley towards the basin of the Atne lake. A gravel terrace was built up, to a height of 790-800 m. partly in a marginal lake, partly upon the edge of the dead glacier.