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| 2. |
- Bergman, Ingela, et al.
(författare)
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Isostatic land uplift and Mesolithic landscapes : lake tilting, a key to the discovery of Mesolithic sites in the interior of Northern Sweden
- 2003
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Ingår i: Journal of Archaeological Science. - : Elsevier. - 0305-4403 .- 1095-9238. ; 30:11, s. 1451-1458
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Tidskriftsartikel (refereegranskat)abstract
- Until recently only a few Mesolithic sites were known from the interior of N. Sweden, although extensive archaeological surveys have been carried out since the 1950s. The lack of archaeological data made every attempt to interpret the process of pioneer colonization quite fruitless. In this paper we present a model of non-uniform glacio-isostatic uplift and lake-tilting used to identify potential areas of Mesolithic habitation. By reconstructing shoreline displacement of ancient lakes, archaeological, palaeoecological and geological studies have resulted in the discovery of a significant number of Mesolithic sites and of an early post-glacial landscape previously unknown.
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| 3. |
- Bouvier, Vera, et al.
(författare)
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Distribution, genesis and annual-origin of De Geer moraines in Sweden: insights revealed by LiDAR
- 2015
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Ingår i: GFF. - : Informa UK Limited. - 1103-5897 .- 2000-0863. ; 137:4, s. 319-333
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Tidskriftsartikel (refereegranskat)abstract
- Abstract: De Geer moraines (DGMs) were first identified in Sweden by Gerard De Geer in 1889 and have been mapped since then in many parts of Sweden. Using airborne Light Detection and Ranging (LiDAR) data, we have mapped DGMs over the entire country, and we show that they occur predominantly in two distinct areas: in south-central Sweden north of the Middle Swedish end-moraine zone and in northeast Sweden. DGM formation occurs predominantly where the local relief is low, the ice-margin retreat rate was high and the sedimentation rate low. Formation of DGMs occurred over short time spans of a few hundred years – between 11 500 and 11 000 cal years BP for the southern group and from 10 700 and 9900 cal years BP for the DGMs in the north. DGMs have been suggested to be made by a number of processes at subaquatic ice margins, including pushing during winter readvance, squeezing into subglacial crevasses, deformation during calving events and deposition as subaquatic fans. Therefore, we recognize DGMs to be equifinal landforms, made by several related mechanisms. However, we observe that the most common occurrence of DGMs in Sweden are as regularly spaced even ridges below the highest shoreline whose spacing closely corresponds to independently determined ice-margin retreat rates. We therefore suggest that where regular evenly spaced DGMs occur, their spacing likely represents the local ice-margin retreat rate, and that the majority of these ridges were made annually by winter advances.
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| 4. |
- Burman, Johan, 1966, et al.
(författare)
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Oceanography in northwestern Europe during the last interglacial from intrashell d18O ranges in Littorina littorea gastropods
- 2008
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Ingår i: Quaternary Research. - : Cambridge University Press (CUP). - 0033-5894 .- 1096-0287. ; 70:1, s. 121-128
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Tidskriftsartikel (refereegranskat)abstract
- Coastal sea-surface temperature (SST) and sea-surface salinity (SSS), including seasonality, in northwest (NW) Europe during the early phase of the Eemian interglacial ca. 125 ka ago were reconstructed from Littorina littorea (common periwinkle) gastropods. The results were based on intra-annual δ18O analyses in recent and fossil shells, mainly originating from the sea of Kattegat (Sweden) and the English Channel (United Kingdom), and confined to intertidal settings. The Eemian L. littorea shells indicated annual SSTs in the range 8-18°C for the English Channel and 8-26°C for Kattegat. All specimens from the Eemian sites experienced summer SSTs of ca. 1-3°C above recent conditions. The estimated winter SST in the English Channel during the Eemian was comparable to modern measurements of ca. 8°C. However, the Kattegat region displayed Eemian winter SST approximately 8°C warmer than today, and similar to conditions in the western English Channel. The recent-fossil isotope analogue approach indicated high SSS above 35 practical salinity units (psu) for a channel south of England in full contact with the North Atlantic Ocean during the last interglacial. In addition, the Kattegat shells indicated a SSS of ca. 29 psu, which points out a North Sea affinity for this region during the Eemian.
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| 6. |
- Tafesse, Solomon, 1975-
(författare)
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Physical properties of coarse particles in till coupled to bedrock composition based on new 3D image analysis method
- 2010
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The physical properties of the coarse fraction of the till (0.4 to 20 cm) and the surface boulders have been studied at two different sites in Sweden. The research work included: development of a new image analysis software for 3D size and shape measurements of particles; lithological analysis on multiple size fractions in till and magnetic susceptibility survey on coarse till clasts, surface boulders and local bedrock. The new 3D image analysis method provides an enormous amount of size and shape data for each particle in the coarse fraction (2 to 20 cm) in till. The method is suitable for field study, cost effective and the software is executable in Matlab. The field imaging method together with the image analysis software give non subjective results of size and shape of coarse particles and makes it feasible and easy to study representative sample size, which is one tonne for testing clasts of size up to 20 cm. The lithological analysis of the multiple size fraction of the till clasts has been investigated on six different size fractions of the till (0.4 to 20 cm); the result of the different samples from the two sites shows that this method can potentially be used as a stratigraphic tool in the areas where there is no unique indicator lithologies. The magnetic susceptibility has been made on the surface boulders, the 6-20 cm till fraction and on insitu bedrock outcrops near to the study sites. The method has good potential for determining stratigraphic relationships between different till units as well as for determining the provenance ofcoarse clasts and surface boulders.
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