STRATIGRAPHY AND SEDIMENTOLOGY OF MIDDLE TO UPPER PLEISTOCENE SEDIMENTS IN THE NEW GRODELAND BOREHOLE AT JAEREN, SW NORWAY

The new Grodeland borehole penetrates 124.5 m of Pleistocene sediments at the coast of Jaeren. Amino-acid analysis suggests that the success ion is of Saalian to Weichselian age. Six major units dominated by til ls, glaciomarine and marine deposits were recovered: Unit 1 rests on c rystalline bedrock and comprises 42 m of subglacial till. Unit 2 compr ises silty and sandy sediments deposited in a glaciomarine environment , grading into normal marine and back to glaciomarine conditions befor e deposition of the overlying till (unit 3). Unit 3 is 32 m thick subg lacial till. Unit 4 was deposited in a shallow glaciomarine environmen t. The succession is capped by the uppermost subglacial till (unit 5) of assumed Early Weichselian age, and a Holocene beach deposit. The st ratigraphy is compared with the classic results from the Grodeland cor ing carried out at this site in i874.