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Abbravation: Quaternary Research

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Cambridge University Press

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10.1002/jrs.1848

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1096-0287

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Late Weichselian Marine span class="sup"14/span

Authors: Stein Bondevik Hilary H Birks Steinar Gulliksen Jan Mangerud
Publish Date: 1999/07
Volume: 52, Issue: 1, Pages: 104-114
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Abstract

A shallow marine Late Weichselian deposit on the outer coast of western Norway contains both terrestrial plant material and articulated marine shells We have 14C dated both types of material from eight different stratigraphic levels covering the time interval 12300 to 11100 14C yr BP The difference between 14Cdated terrestrial plant material and marine shell material the marine reservoir age ranges from 200 to 525 yr with a weighted average of 380 ± 32 yr This is almost identical to the present reservoir age of 379 ± 20 yr for southern Norway In the midYounger Dryas YD interval the reservoir age in the North Atlantic 55°N–65°N was 700–800 yr considerably greater than the present reservoir age and the age we have measured for the Bølling–Allerød interval The reason for this increase during the YD is probably a combination of reduced inflow of surface waters to the North Atlantic and more extensive seaice cover Evidence from marine cores show that the southeastern Norwegian Sea experienced rapid fluctuations in the inflow of warm Atlantic surface water during the period 12300 to 11000 yr BP However the reservoir age apparently did not increase during these colder periods Older Dryas I and II The reason is probably that in contrast to the YD these colder periods did not last long enough and/or were of too limited extent to alter the reservoir age of the ocean A comparison of the obtained 14C dates with the varve 14C chronology from Lake Suigetsu indicates an age of 12770 cal yr BP for the AL/YD boundary

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citation title=Marine Mussels Their Ecology and Physiology citation author=Seed R citation author=Bayne BL citation publication date=1976 citation firstpage=411

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