A5071708371- Geology and Paleoclimatology Research
- Climate change and permafrost
- Peatlands and Wetlands Ecology
- Pleistocene-Era Hominins and Archaeology
- Scientific Research and Discoveries
- Botany and Plant Ecology Studies
- Cryospheric studies and observations
- Marine and environmental studies
- Geological Formations and Processes Exploration
- Isotope Analysis in Ecology
- Geomagnetism and Paleomagnetism Studies
- Geological Studies and Exploration
- Plant Pathogens and Fungal Diseases
- Landslides and related hazards
- Geological formations and processes
- Diatoms and Algae Research
- Forest Ecology and Biodiversity Studies
Stockholm University
1992-2023
Geological Survey of Sweden
1974-1995
The extent of vegetation openness in past European landscapes is widely debated. In particular, the temperate forest biome has traditionally been defined as dense, closed-canopy forest; however, some argue that large herbivores maintained greater or even wood-pasture conditions. Here, we address this question for Last Interglacial period (129,000-116,000 years ago), before Homo sapiens-linked megafauna declines and anthropogenic landscape transformation. We applied reconstruction method...
An active search for pre‐Holocene organic deposits in stratigraphically well‐defined positions has proved to be a useful tool reconstruction of glacial and non‐glacial Weichselian development northernmost Sweden. The investigations have been concentrated kettle holes connected eskers belonging morphologically prominent northwesterly system characterized by extensive drumlinization. Organic deposits, radiocarbon‐dated as older than the Holocene, found at some 25 localities. Some sites display...
Abstract The Transtrand Mountains, western Sweden, are characterised by an abundance of glaciofluvial meltwater channels. Crossing lateral channels and channel systems overprinted fluting occur at several localities. Drainage from three older deglaciations interpreted to have been preserved despite overriding later ice sheets. Deep sections, machine excavated into the summit surface Hundfjället Mountain, revealed presence two lower diamictons which generations were cut, subsequently buried a...
Hättestrand, M. & Robertsson, A.‐M. 2010: Weichselian interstadials at Riipiharju, northern Sweden – interpretation of vegetation and climate from fossil modern pollen records. Boreas , 10.1111/j.1502‐3885.2009.00129.x. ISSN 0300‐9483. The most complete records ice‐free conditions in have been retrieved kettleholes the Riipiharju esker. In an earlier study, I core was described as containing two chosen type site for second interstadial Sweden. Here, we present a palynological...
At Margreteberg, southwestern Sweden, a comple Pleistocene sequence has been stratigraphically investigated. Strata of clay, silt, sand, peat and solifluction layers are overlain by till‐like sediments which covered sandy‐clayey strata. By means biostratigraphical analyses (foraminifera, olluscs, wood remains, pollen diatoms), reconstruction the palaeoenvirnmental development obtained. Radiocarbon measurements amiono acis ratios have carried out in order to date sediments. The foraminifera...
Eemian—Weichselian sequences, located outside the maximum limit of Late Weichselian ice sheet, provide excellent opportunities for discovery continuous sedimentary records encompassing whole Last Interglacial/Glacial cycle. Such a sequence is recorded in borehole (117P) through succession small kettlehole lake at Medininkai, eastern Lithuania. The consists peat, gyttja and silt deposited on top Saalian till. Pollen plant macrofossil analysis, lithological U/Th dating mineral magnetic...
Eemian-Weichselian sequences, located outside the maximum limit of Late Weichselian ice sheet, provide excellent opportunities for discovery continuous sedimentary records encompassing whole Last Interglacial/Glacial cycle. Such a sequence is recorded in borehole (117P) through succession small kettlehole lake at Medininkai, eastern Lithuania. The consists peat, gyttja and silt deposited on top Saalian till. Pollen plant macrofossil analysis, lithological U/Th dating mineral magnetic...
Robertsson, A.‐M., Svedlund, J.‐O., Andrén, T. & Sundh, M. 1997 (September): Pleistocene stratigraphy in the Dellen region, central Sweden. Boreas , Vol. 26, pp. 237–260. Oslo. ISSN 0300–9483. The Sweden was studied using field observations made during mapping of Quaternary deposits and fabric analyses excavated sections. lithostratigraphy also by seismic refraction measurements, grain‐size distribution organic carbon content. Biostratigraphical methods applied were pollen diatom...
Till‐covered sand and silt sediments with organic material from Boliden, northern Sweden, have been resampled reinvestigated. Texture petrographic analyses demonstrated one till bed overlying, underlying the sandy sediments. Low frequencies of diatoms were noted, representing freshwater, halophilous brackish water taxa. The may be allochthonous or autochthonous, redeposited older deposits. Pollen analysis revealed a new picture composition vegetation, as compared earlier investigations....
The till‐covered organic sediments at Leveäiemi, Swedish Lapland have been reinvestigated by pollen analysis in order to gather more detailed information on vegetation history and climatic conditions during the interglacial period represented this site. A partly different picture of succession has arisen compared earlier studies results. sequence is still correlated with Eemian, but forests were probably open initial later parts interglaciation than suggested earlier. This based higher...
The till‐covered organic sediments at Härnösand have been resampled and reinvestigated with respect to their micro‐ macrofossil content. were deposited in a shallow freshwater basin sandy substratum probably under oligotrophic conditions. regional vegetation consisted of shrub or herb tundra, later changing into an open Betula forest scattered Picea Larix . In the lake, submerged plants such as Potamogeton filiformis Isoëtes lacustris grew, together Carex On shores nana , occasional trees,...
A peat layer beneath two till beds was found at Seitevare in Swedish Lapland. The pollen flora indicates deposition during the later part of Eemian Interglacial. vegetation consisted open forests predominated by pine and birch, mixed with alder spruce. sedimentation took place a small oligotrophic‐dystrophic water basin pH about 5, according to diatom flora. In an adjacent section, silty sediments indicating interstadial (birches, herbs) are covered one bed. These tentatively correlated...
Abstract Eight sites with a dark, clayey basal till in central Sweden have been studied by means of microfossils order to clarify the stratigraphic position till. The composition identified reworked pollen and diatom floras shows interstadial or interglacial “signatures”. Pollen spectra dominated herbs, shrubs Betula are supposed be origin. is mostly characterised 80-90% tree including thermophilous trees brackish water diatoms (Spånga). However, distinguish origin from sediments deposited...
Abstract The current status of knowledge concerning the Eemian interglacial in Sweden is surveyed, and comparisons are made with northern western Finland. course shore displacement fragmentarily known for Sweden, since brackish-marine sediments have been identified, on basis diatom analysis, at only few sites. In Finland, other hand, a shoredisplacement curve has constructed Baltic Sea Ostrobothnia, central vegetation history summarised southernmost part can be correlated that documented...
Abstract While preparing a detailed map of the Quaternary deposits within natural reserve 'Sveafallen', one largest potholes in area was discovered and cleaned. Pollen analyses clay deposited pothole verify that during end Pre-boreal (PB) early Boreal (BO 1). The consequently formed earlier erosion had no connection with outlet Ancylus Lake. Key Words: Potholepollen analysisSvea RiverAncylus LakeDegerforsSwedenN6567N6567E1422 E1422
Weichselian interstadial vegetation history has been studied by means of pollen analysis organic bearing fine-grained sediments at Dörrsvålen and Brovalltjärnen in a low mountain area Härjedalen. The composition the flora suggests treeless consisting shrubs herbs. consisted Betula nana, Ericaceae, Juniperus Salix spp. mixed with herbaceous plant communities including Gramineae, Cyperaceae, Caryophyllaceae, Saxifraga, Rumex/Oxyria Polygonum. Pinus are represented long distance-transported...
Abstract Pollen analysis and radiocarbon datings were made on two samples of silty sand clay with organic material. These fine-grained sediments covered by 6–7 m sandy gravel in a deposit at Åseda, central Småland, southern Sweden. The pollen flora indicates that the material represents remains tundra vegetation. has given Younger Dryas ages (10 170 10 400 B.P.). deglaciation area around Åseda was evidently complicated. ice is thought to have left about 12 200 B.P.