Rapid adiustments of the western part of the Scandinavian lee Sheet during the Mid and late Weichselian - a new model

Regional Quaternary stratigraphy, fossil content (marine mollusc shells, dinocysts, pollen, etc.), some palaeomagnetic data, and more than 200
datings, mostly AMS-14C datings of organic-bearing tills and sub-till waterlain sediments from the northern, central and southern parts of Norway
are the basis for construction of nine glaciation curves from the inland to the coast and shelf, and for interpretation of the palaeodimate. The
results show rapid shifts between glacial and interstadial conditions in semi-cydes of five thousand to seven thousand years in the interval from c.
40-45 ka to 10 ka (14C) BP. We describe these glacial variations in a new model which retlects rapid and ry thmic glacier tluctuations. The condusions with regard to num ber and size ( extent) of the glacial and interstadial events are based on stratigraphy, whereas the timing and rapidity of events are based on dates. All these basis data are presented more thoroughly in an accompanying pa per ( this volume). The interstadials are named the Hattfjelldal interstadial I (30-39 ka BP ) and Il (24-27 ka BP), and the Trofors interstadial (17-21 ka BP). P reviously reported interstadials are extended in this study to include larger inland areas, indicating extreme tluctuations several times both in the extent and volume of the ice. Considerable ice retreat with very extensive ice-free areas in several parts of Norway during the last two interstadials (c. 24-27 and c. 17-21 ka BP) have not been reported before, except for preliminary short notices from o ur studies. The stratigraphical record includes many indications of high preHolocene relative sea-levels, suggesting a considerable glacial isostatic depression of western Scandinavia during the interstadials. We suggest that, in addition to precipitation, the mountainous fjord and valley topography, glacial isostasy and relative sea-level changes were probably more important for the size of the glacial tluctuations than the air-temperature changes.

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