Ski. Kvartærgeologisk kart 1914 III - M 1 : 50 000. Beskrivelse

SKRIFTER
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95
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Forfattere
Nordahl-Olsen, Torkill
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Utgivelsesår
1990
Publikasjonstype
Utgivelsesår
1990
Summary
The superficial deposits within the area of map-sheet Ski, southeastern Norway, are classified and described. The areas above the upper marine limit (c. 215 m a.s.l.) are dominated by exposed bedrock. Below the upper marine limit fine-grained, marine sediments predominate. These are commonly overlain by sandy and gravelly marine shore deposits. Till in superficial position occurs almost exclusively in the numerous, well marked terminal moraines. The dominating parts of the marine shore deposits are closely tied to moraine areas where the till ridges, during isostatic uplift, were easily eroded and the material resedimented along a shoreline. Ice movements and the course of the deglaciation have been reconstructed. The oldest ice movement was towards the south; later, the ice-movement in the area turned towards a the southwest (with Oslofjorden as the confluence area). During the deglaciation of the mapped area, there were several major glacial events (the Vestby, Ås and Ski events) marking advances or halts of the ice-front. The Ås and Ski events are dated to c. 10,200 and 10,000 B.P., respectively. Short accounts are given of shorelines, shore-level displacement and pollen analyses. The forest evolution in the Ski area is described.
Kommune
ÅS
NORDRE FOLLO
FROGN
ENEBAKK
VESTBY
INDRE ØSTFOLD
SKIPTVET
VÅLER ØSTFOLD
Fylke
VIKEN
Tilgjengelig
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