Sökning: "late Neogene"

Visar resultat 6 - 9 av 9 avhandlingar innehållade orden late Neogene.

  1. 6. Biostratigraphic implications of Neogene diatom abundances in the Norwegian Sea, the North Atlantic and the western North Pacific

    Författare :Per Bodén; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This thesis consists of three separate articles and are mainly concerned with the taxonomy of species from the genus Thalassiosira and quantitative diatom biostratigraphy in three oceanic regions of the northern hemisphere. The study material consists of Ocean Drilling Program (ODP) Holes 642B, 642C and 644A at about 67°N in the Norwegian Sea, Deep Sea Drilling Project (DSDP) Hole 552A at 56 N in the North Atlantic, and DSDP Site 578 at 34°N in the northwest Pacific. LÄS MER

  3. 7. Cenozoic landscape evolution in northern Sweden : Geomorphological interpretation within a GIS-framework

    Författare :Karin Ebert; Clas Hättestrand; Paul Bishop; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Long-term geomorphology; northern Sweden; base-level surface; inselbergs; digital elevation models; field observations; Physical geography; Naturgeografi; Physical Geography; naturgeografi;

    Sammanfattning : The large-scale bedrock landscape in northern Sweden has a complex evolution history of planation, uplift, transgression, burial, weathering, and erosion. The aim of this thesis is to examine the long-term development of the area. Terms for base-level surfaces in the area are defined. LÄS MER

  4. 8. Paleoceanography of the Eastern Equatorial Pacific over the last eight million years

    Författare :Daniele Reghellin; Jan Backman; Per Andersson; Eve Arnold; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Marine Geology; maringeologi;

    Sammanfattning : Many studies have investigated the evolution of the Eastern Equatorial Pacific (EEP) Ocean paleoceanography since the late Neogene because of its role in regulating the Earth’s climate and because global climate has undergone major changes during this time period. However, current understanding of the EEP paleoceanography encounters two basic problems. LÄS MER

  5. 9. Evolutionary studies of the Gnetales

    Författare :Chen Hou; Catarina Rydin; Richard Saunders; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; växtsystematik; Plant Systematics;

    Sammanfattning : The Gnetales consist of three distinct genera, Ephedra, Gnetum and Welwitschia with considerable divergence among them regarding morphological, ecological and molecular characters. A longstanding debate of the similarity between the Gnetales and angiosperms and the unresolved seed plant phylogeny intrigues plant scientists to further investigate the evolutionary history of the Gnetales. LÄS MER