NJG62-1-04
1982
The genesis of tills from Åstadalen, southeastern Norway
62
1
17-38

lee movements in Åstadalen originated from the north and later from the northwest. Most of the area is covered by a 1-5 m thick till which does not create independent landforms. In the mountainous areas, this till is local and coarse-grained and iriterpreted as a subglacial melt-out till. Here the glacier was probably rather passive when the till was formed. A complex till occurs along the eastern valley side. At typical leeside localities, the local coarse-grained till is most probably of a subglacial melt-out origin. Along the
western valley side and western upland area, the till is everywhere rather fine-grained and compact, and cobbles and boulders are abraded. Most parts of this till were formed by a lodgement process. Transverse moraine ridges, mainly occurring along the western part of the valley, are composed of till which is
interpreted as subglacial melt-out till. Some probably supraglacial material occurs at the top. Hummocks consisting of diamicton are found, particularly along the eastern side of the valley. These are composed mainly of earlier deposited subglacial till, which was subsequently transported on to the surface of the valley ice from ice-free valley sides. Most of the till material in Åstadalen is therefore believed to originale from basally transported glacial debris.

0029-196X
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