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Sökning: hsv:(NATURVETENSKAP) hsv:(Geovetenskap och miljövetenskap) hsv:(Geologi) > Högskolan Kristianstad

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  • Einarsson, Elisabeth (författare)
  • Dinosaurier och andra fossil
  • 2010
  • Ingår i: Bladet. ; 10:1
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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  • Einarsson, Elisabeth (författare)
  • Dinosaurier på schemat!
  • 2008
  • Ingår i: Bladet. ; 08:4
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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  • Einarsson, Elisabeth (författare)
  • Paleoenvironments, palaeoecology and palaeobiogeography of late cretaceous (campanian) faunas from the Kristianstad basin, southern Sweden, with applications for science education
  • 2018
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • This thesis is thematically divided into two sections: Part1 presents studies related to the palaeoenvironments,palaeoecology and palaeobiogeography of the LateCretaceous (Campanian) faunas from the KristianstadBasin of southern Sweden; Part 2 reports on applicationsof palaeontological research for science education inschools.Part 1 was based on personally conducted fieldworkand biostratigraphical analysis at various Santonian-Campanian localities throughout Skåne. However, themost complete section at Åsen provided the primary datasource and was systematically excavated with a team ofvolunteers, who employed wet-sieving methods to extractbulk fossil material from each bed within the sequence. Aseries of globally correlated temperature-induced changeswas detected in the stepwise declining abundanceand disappearance of rudists, sclerorhynchids and therajiforms Rhinobatos and Squatirhina, as well as marinecrocodilians, various mosasaurid lizard taxa. A rangeof local palaeoenvironments were also reconstructed,including estuaries, rocky coastlines, sandy beaches,drowned river valleys, shallow neritic settings, anddeeper offshore conditions. An archipelago bordering theFennoscandian landmasses also supported continentalecosystems comprising ferns, conifers and early floweringplants, with dinosaurs, pterosaurs and non-marine turtles.Trophic levels within the marine system incorporatedred algae and dinoflagellates as primary producers, withcorals, brachiopods, bivalves, echinoids, barnacles anddecapod crustaceans as benthos, and belemnites withinthe water column. Actinopterygian fish, sharks, rays andchimaeroids, chelonioid sea turtles, marine crocodilians,polycotylid and elasmosaurid plesiosaurians, variousmosasaurids and aquatic hesperornithiform birdscollectively represented middle level and apex predators.Herbivorous and carnivorous dinosaurs, lizards and softshelledtryonichid turtles evidence elements of terrestrialisland communities. The palaeobiogeographicalrelationships and dispersal of these local assemblageswas probably influenced by marine transgressions andregressions. These would have affected habitat availabilityand connectivity via changing water depths.Part 2 presents three school education projects aimed atincreasing awareness of geoscience and natural history inschools. The better integration of geological time conceptsand geosciences into the Swedish school curriculum isalso discussed. The first study described a project wherebyfossils were found in the sandboxes in preschools, andtheir use as a tool for learning about dinosaurs, fossilsand natural history. A survey of teachers and childrenfound that both increased their knowledge base throughthis approach, and that the local context of the fossilsin particular generated interest about the subject. Theconcepts of geological time was similarly addressed in thesecond study, which utilized timescale projects and otherhands-on activities to create memory triggers for childrenand students, and to demonstrate how the perspective of‘deep time’ is relevant for understanding large-scale Earthprocesses, such as evolution and environmental change.The integration of geosciences into the Swedish schoolcurriculum is currently inadequate. Therefore, the finalpaper in this sequence discusses how geosciences forman interdisciplinary bridge between school subjects andcan be used to teach geography and biology at all schoollevels.
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  • Regnéll, Joachim, 1956-, et al. (författare)
  • Ice-dammed lakes of Scandinavia : A key to the pattern and chronology of the final decay of the Scandinavian ice-sheet
  • 2021
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Here we present the use of ice-dammed lake-related landforms and sediments for reconstructing the final phases of decay of the Scandinavian Ice Sheet.In the late stages of the deglaciation, extensive glacial lakes were dammed between the easterly retreating Scandinavian Ice Sheet and the water divide within the mountains to the west. Using high-resolution airborne LiDAR-data, shorelines and other landforms relating to these ice-dammed lakes have now been discovered over larger areas and in greater numbers than previously known, opening a treasure trove of palaeoglaciological information of vast potential for reconstructing the final decay phase of the Scandinavian Ice Sheet.The geomorphological imprint of the ice-dammed lakes is of particular importance in northern Scandinavia, as geological evidence pertaining unequivocally to the final ice sheet decay is sparse. Its interpretation is complicated since the ice sheet is thought to have mainly been cold-based during final decay, inhibiting sliding at the ice-bed interface and limiting the construction (or destruction) of landforms indicative of the changing shape and flow of the ice sheet. Furthermore, dated sediment sequences marking the onset of ice-free conditions are woefully few in northern Scandinavia. Likewise, available cosmogenic nuclide exposure dates provide high age uncertainty and inadequate geographical cover, leaving the timing and location of final ice sheet decay still elusive.Using examples from northern and central Scandinavia, we show that ice-dammed lakes are an intricate part of the deglacial dynamics and show how mapping and dating them offer a solution to these problems. Even with a frozen ice-bed interface, surface melting and meltwater drainage creates landforms unequivocally associated with ice sheet decay: drainage channels, dammed lake shorelines, and deltas. Meltwater drainage routes and ice-dammed lakes are therefore powerful tools for reconstructing a disintegrating ice sheet; a ponded lake reveals the location of its requisite ice-dam, and drainage pathways reveal ice-free conditions. A dated sequence of ice-dammed lake sediments can therefore constrain both ice and lake coverage at that time for a much larger area than the dated site itself. Furthermore, the extent of different ice-dammed lake stages and their requisite ice-damming positions enables the pattern of ice margin change to be traced, and the relative age of ice-marginal positions determined using cross-cutting relations. The shorelines’ present-day tilts are also used to inform patterns and magnitudes of postglacial isostatic uplift, information otherwise lacking from the continental interior but of particular importance for modelling former ice sheet volumes and understanding the crustal response to ice sheet loading. Reconstructing the extents and timing of ice-dammed lakes and the study of related landforms and deposits can therefore greatly improve our understanding of the final decay of the Scandinavian Ice Sheet and provide potential analogues for the predicted future behaviours of modern ice sheets.
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10.
  • Salvigsen, Otto, et al. (författare)
  • Glacial history and shoreline displacement on Erdmannflya and Bohemanflya, Spitsbergen, Svalbard
  • 1990
  • Ingår i: Polar Research. - 0800-0395 .- 1751-8369. ; 8:2, s. 261-273
  • Tidskriftsartikel (refereegranskat)abstract
    • Traces of former glaciation were studied on Erdmannflya and Bohemanflya. Both peninsulas were probably completely covered by glaciers during the Late Weichselian and the final deglaciation took place around 10,000 C-14 years BP. Esmarkbreen readvanced shortly after 9,500 BP, probably a local and shortlasting event. Raised beaches occur to about 60 m above sea level, and date back to about 10,000 BP. Initial land emergence was rapid, about 3m/100 years. It seems to have been followed by a marine transgression between 8,500 and 7,500 BP, which resulted in a large and distinct beach bridge and marine abrasion cliffs about 10-12 m above present sea level. Mytilus edulis lived in the area between at least 9,000 and 5,000 BP. Five thousand years ago relative sea level probably stood 3-4 m higher than today. Relative sea level has remained close to present during the last centuries. Different positions of glacier fronts in this century have also been mapped.
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