Coastal lake records add constraints to the age and magnitude of the Younger Dryas ice‐front oscillation along the Skagerrak coastline in southern Norway
ABSTRACT Basal records from nine lake basins, located within a small area inside the Younger Dryas Ra moraine in southern Norway, were analysed and radiocarbon dated. Six reworked shell fragments from the lowermost facies in five different basins date to the Bølling–Allerød chronozone and are interp...
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crwiley:10.1002/jqs.3085 2024-06-02T08:08:12+00:00 Coastal lake records add constraints to the age and magnitude of the Younger Dryas ice‐front oscillation along the Skagerrak coastline in southern Norway Romundset, Anders Lakeman, Thomas R. Høgaas, Fredrik 2019 http://dx.doi.org/10.1002/jqs.3085 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.3085 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3085 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 34, issue 2, page 112-124 ISSN 0267-8179 1099-1417 journal-article 2019 crwiley https://doi.org/10.1002/jqs.3085 2024-05-03T11:54:18Z ABSTRACT Basal records from nine lake basins, located within a small area inside the Younger Dryas Ra moraine in southern Norway, were analysed and radiocarbon dated. Six reworked shell fragments from the lowermost facies in five different basins date to the Bølling–Allerød chronozone and are interpreted to represent an ice‐free coastline before a Younger Dryas ice sheet readvance of at least 8 km. The widespread shell fragments within the Younger Dryas ice margin but pre‐dating the Younger Dryas are demonstrated using a systematic survey of the lowermost strata in a collection of lake basins. A further 13 dated samples, mostly in situ articulated bivalves found in clayey silt overlying the basal facies, yielded overlapping ages close to the Younger Dryas–Holocene boundary. The 13 shell dates, along with two additional similar ages obtained on terrestrial plant macrofossils from basal strata in two basins near the marine limit, provide a minimum‐limiting age of 11.6k cal a BP for ice sheet retreat from the Ra moraine. This suggests that the ice sheet in south‐east Norway retreated from its Younger Dryas maximum position nearly a thousand years later than previously assumed. Similar systematic approaches may lead to improved ice sheet reconstructions from other formerly glaciated coastlines. Article in Journal/Newspaper Ice Sheet Wiley Online Library Nine Lake ENVELOPE(-128.903,-128.903,55.875,55.875) Norway Journal of Quaternary Science 34 2 112 124 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
ABSTRACT Basal records from nine lake basins, located within a small area inside the Younger Dryas Ra moraine in southern Norway, were analysed and radiocarbon dated. Six reworked shell fragments from the lowermost facies in five different basins date to the Bølling–Allerød chronozone and are interpreted to represent an ice‐free coastline before a Younger Dryas ice sheet readvance of at least 8 km. The widespread shell fragments within the Younger Dryas ice margin but pre‐dating the Younger Dryas are demonstrated using a systematic survey of the lowermost strata in a collection of lake basins. A further 13 dated samples, mostly in situ articulated bivalves found in clayey silt overlying the basal facies, yielded overlapping ages close to the Younger Dryas–Holocene boundary. The 13 shell dates, along with two additional similar ages obtained on terrestrial plant macrofossils from basal strata in two basins near the marine limit, provide a minimum‐limiting age of 11.6k cal a BP for ice sheet retreat from the Ra moraine. This suggests that the ice sheet in south‐east Norway retreated from its Younger Dryas maximum position nearly a thousand years later than previously assumed. Similar systematic approaches may lead to improved ice sheet reconstructions from other formerly glaciated coastlines. |
format |
Article in Journal/Newspaper |
author |
Romundset, Anders Lakeman, Thomas R. Høgaas, Fredrik |
spellingShingle |
Romundset, Anders Lakeman, Thomas R. Høgaas, Fredrik Coastal lake records add constraints to the age and magnitude of the Younger Dryas ice‐front oscillation along the Skagerrak coastline in southern Norway |
author_facet |
Romundset, Anders Lakeman, Thomas R. Høgaas, Fredrik |
author_sort |
Romundset, Anders |
title |
Coastal lake records add constraints to the age and magnitude of the Younger Dryas ice‐front oscillation along the Skagerrak coastline in southern Norway |
title_short |
Coastal lake records add constraints to the age and magnitude of the Younger Dryas ice‐front oscillation along the Skagerrak coastline in southern Norway |
title_full |
Coastal lake records add constraints to the age and magnitude of the Younger Dryas ice‐front oscillation along the Skagerrak coastline in southern Norway |
title_fullStr |
Coastal lake records add constraints to the age and magnitude of the Younger Dryas ice‐front oscillation along the Skagerrak coastline in southern Norway |
title_full_unstemmed |
Coastal lake records add constraints to the age and magnitude of the Younger Dryas ice‐front oscillation along the Skagerrak coastline in southern Norway |
title_sort |
coastal lake records add constraints to the age and magnitude of the younger dryas ice‐front oscillation along the skagerrak coastline in southern norway |
publisher |
Wiley |
publishDate |
2019 |
url |
http://dx.doi.org/10.1002/jqs.3085 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.3085 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3085 |
long_lat |
ENVELOPE(-128.903,-128.903,55.875,55.875) |
geographic |
Nine Lake Norway |
geographic_facet |
Nine Lake Norway |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Journal of Quaternary Science volume 34, issue 2, page 112-124 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.3085 |
container_title |
Journal of Quaternary Science |
container_volume |
34 |
container_issue |
2 |
container_start_page |
112 |
op_container_end_page |
124 |
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1800753404831596544 |