Allerod-Younger Dryas Climatic Inferences from Cirque Glaciers and Vegetational Development in the Nordfjord Area, Western Norway

1984 ◽  
Vol 16 (2) ◽  
pp. 137 ◽  
Author(s):  
Eiliv Larsen ◽  
Froydis Eide ◽  
Oddvar Longva ◽  
Jan Mangerud
Keyword(s):  
Younger Dryas ◽  
Western Norway

Tephrochronological evidence of a later Younger Dryas ice-sheet maximum in central Norway

2021 ◽  
Author(s):  
Simon A. Larsson ◽  
Stefan Wastegård ◽  
Fredrik Høgaas
Keyword(s):  
Radiocarbon Dating ◽  
Ice Sheet ◽  
Younger Dryas ◽  
Coastal Lake ◽  
Cold Event ◽  
Western Norway ◽  
Scandinavian Ice Sheet ◽  
Marine Fossils ◽  
Ice Sheet Dynamics ◽  
Southern Norway

<p>The Scandinavian Ice Sheet responded time-transgressively to the Younger Dryas (Greenland Stadial 1) cold event with large regional variations. Around Trondheimsfjorden in central Norway, the Tautra Moraines and the Hoklingen Moraines have long been assumed to have formed by glacial readvances during this event, as they have been dated to c. 12.7 and 11.6 cal. ka BP respectively (Olsen et al., 2015), mainly based on radiocarbon dating of often marine fossils. The Tautra Moraines, being the outer ridges of the two, should thus represent the maximum ice-sheet extent in this region during the Younger Dryas.</p><p>This ice-front position established a pro-glacial lake west of present-day Leksvik village on the Fosen peninsula (Selnes, 1982), which covered the Lomtjønnin lakes and Lomtjønnmyran fens, and drained through a spillway via Lake Rørtjønna. Some 20 km inland (northeast) from this location, inside the Tautra Moraines, the location of the Damåsmyran bog was covered by the ice sheet at that time.</p><p>By examining sediments from these sites for occurrences of volcanic ashes (visible and cryptotephra), combined with radiocarbon dating, we find that the ice front remained at the Tautra Moraines until the late Younger Dryas, contrary to the previous chronology (and overriding the suggested formation age of the Hoklingen Moraines). These findings comply with several recent reconstructions of the deglaciation at other sites in western (Lohne et al., 2012; Mangerud et al., 2016) and southern Norway (Romundset et al., 2019) and are a strong example of the usefulness of tephrochronology in the reconstruction of past ice-sheet dynamics.</p><p> </p><p><strong>References</strong></p><p>Lohne, Ø.S., Mangerud, J. & Svendsen, J.I. (2012) Timing of the Younger Dryas glacial maximum in Western Norway. <em>Journal of Quaternary Science</em>, vol. 27, pp. 81–88.</p><p>Mangerud, J., Aarseth, I., et al. (2016) A major re-growth of the Scandinavian Ice Sheet in western Norway during Allerød–Younger Dryas. <em>Quaternary Science Reviews</em>, vol. 132, pp. 175–205.</p><p>Olsen, L., Høgaas, F. & Sveian, H. (2015) Age of the Younger Dryas ice-marginal substages in Mid-Norway—Tautra and Hoklingen, based on a compilation of 14C-dates. <em>Norges geologiske undersøkelse Bulletin</em>, vol. 454, pp. 1–13.</p><p>Romundset, A., Lakeman, T.R. & Høgaas, F. (2019) Coastal lake records add constraints to the age and magnitude of the Younger Dryas ice-front oscillation along the Skagerrak coastline in southern Norway. <em>Journal of Quaternary Science</em>, vol. 34, pp. 112–124.</p><p>Selnes, H. (1982) Paleo-økologiske undersøkelser omkring israndavsetninger på Fosenhalvøya, Midt-Norge. Thesis at the Department of Botany, University of Trondheim.</p>

A major re-growth of the Scandinavian Ice Sheet in western Norway during Allerød-Younger Dryas

2016 ◽  
Vol 132 ◽  
pp. 175-205 ◽  
Author(s):  
Jan Mangerud ◽  
Inge Aarseth ◽  
Anna L.C. Hughes ◽  
Øystein S. Lohne ◽  
Kåre Skår ◽  
...  
Keyword(s):  
Ice Sheet ◽  
Younger Dryas ◽  
Western Norway ◽  
Scandinavian Ice Sheet

scholarly journals Sea-level fluctuations imply that the Younger Dryas ice-sheet expansion in western Norway commenced during the Allerød

2007 ◽  
Vol 26 (17-18) ◽  
pp. 2128-2151 ◽  
Author(s):  
Øystein S. Lohne ◽  
Stein Bondevik ◽  
Jan Mangerud ◽  
John Inge Svendsen
Keyword(s):  
Sea Level ◽  
Ice Sheet ◽  
Younger Dryas ◽  
Sea Level Fluctuations ◽  
Western Norway

A calendar age estimate of the Younger Dryas-Holocene boundary at Kråkenes, western Norway

The Holocene ◽  
1998 ◽  
Vol 8 (3) ◽  
pp. 249-259 ◽  
Author(s):  
Steinar Gulliksen ◽  
Hilary H. Birks ◽  
Göran Possnert ◽  
Jan Mangerud
Keyword(s):  
Younger Dryas ◽  
Western Norway

New Radiocarbon Dates for the Vedde Ash and the Saksunarvatn Ash from Western Norway

1996 ◽  
Vol 45 (2) ◽  
pp. 119-127 ◽  
Author(s):  
Hilary H. Birks ◽  
Steinar Gulliksen ◽  
Haflidi Haflidason ◽  
Jan Mangerud ◽  
Göran Possnert
Keyword(s):  
Lake Sediment ◽  
Younger Dryas ◽  
Plant Macrofossils ◽  
Early Holocene ◽  
Radiocarbon Dates ◽  
Terrestrial Plant ◽  
Radiocarbon Age ◽  
The North ◽  
Western Norway ◽  
Ams Dates

AbstractThe Vedde Ash Bed (mid-Younger Dryas) and the Saksunarvatn Ash (early Holocene) are important regional stratigraphic event markers in the North Atlantic, the Norwegian Sea, and the adjacent land area. It is thus essential to date them as precisely as possible. The occurrence of the Saksunarvatn Ash is reported for the first time from western Norway, and both tephras are dated precisely by AMS analyses of terrestrial plant material and lake sediment at Kråkenes. The Vedde Ash has been previously dated at sites in western Norway to about 10,600 yr B.P. It is obvious in the Younger Dryas sediments at Kråkenes, and its identity is confirmed geochemically. The mean of four AMS dates of samples of Salix herbacea leaves adjacent to the tephra is 10,310 ± 50 yr B.P. The Saksunarvatn Ash is not visible in the early Holocene lake sediment at Kråkenes. After removal of organic material and diatoms, the identity of the tephra particles was confirmed geochemically, and their stratigraphic concentration was estimated. From curve matching of a series of seven AMS dates of terrestrial plant macrofossils and whole sediment, the radiocarbon age of the ash is 8930–9060 yr B.P., corresponding to an age of 9930–10,010 cal yr B.P. (7980–8060 cal yr B.C.).

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