NJG78-2-04
1998
Middle and Late Quaternary depositional history reconstructed from two boreholes at Lågjæren and Høgjæren, SW Norway
78
2
pp. 153-167

Two boreholes drilled in the lowland (Lågjæren) and upland (Høgjæren) area of the Jæren region of SW Norway, revealed sedimentary successions of various ages. The Auestad borehole at Lågjæren, doser to the coast, contained only Saalian sediments. The 35-m-long sedimentary succession comprises fill (unit 1), glaciofluvial and fluvial sediments (unit 2), glaciomarine sediments (unit 3), fill bed (unit 4) and glaciofluvial sediments (unit 5). The Elgane borehole at Høgjæren contained 30 m of Weichselian sediments. The lower part of the succession consists of coarse-grained, probably glaciofluvial sediments (unit l) and till (unit 2). This is overlain by in situ glaciomarine silts (unit 3), deposited before about 33,000 years ago. The Elgane sedimentary succession is capped by clayey till (unit 4). The difference in stratigraphy between the drilling sites suggests intensive erosion at Lågjæren probably by a north-flowing glacier. The two successions indicate four glacial episodes ranging in age from Saalian to Late Weichselian. The glacial phases are separated by marine intrusions. When at its highest, sea level was at !east 200 m above the present level during the Middle Weichselian Sandnes Interstadial.

Juraj Janocko and Per Ivar Steinsund, University of Tromsø, Department of Geology, IBG, N-9000 Tromsø, Norway;
Jon Y. Landvik, The University Courses on Svalbard (UNIS), PO Box 156, N-9170 Longyearbyen, Norway;
Eiliv Larsen, Geological Survey of Norway, PO Box 3006, N-7002 Trondheim, Norway;
Hans Petter Sejrup, University of Bergen, Department of Geology, Allégt. 41, N-5007 Bergen, Norway.

0029-196X