Abstract
Several excavated sections along new roads in Buvika, mid-Norway, display records of large, prehistoric clay slides. Slightly undulating but otherwise intact laminated clay, with minor amounts of unsorted or sorted coarser-grained debris, appears in the sections. Folding, shearing and internal slide surfaces have also been recorded, and the deposits are interpreted as slide debris. Slide-scar morphologies are diffuse or absent for most of these deposits, and the inferred slide mechanism is translation and rotation of blocks on a thin layer of remoulded quick clay. One section cuts through a slide block inside a classic, morphologically well-defined quick-clay slide scar. Varying results from 14C-datings of organic material in the deposits give only maximum ages of the slide events. The style of sliding reflected in several sections differs from slide events in the area known from historical records. These younger slide events seem to be characterised by collapse and remoulding of thicker quick-clay layers. The present study of slide deposits gives information on processes and deformation history of the slides. It is suggested that the gradual formation of quick clay has an important impact on long-term landscape degradation and on the character of the present day landscape. There may be far more signs of slide activity in Norwegian valleys than solely indicated by slide scars and also in the relatively high-lying parts of the valley fill, such as interfluve areas.
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Acknowledgements
The authors thank the Geological Survey of Norway (NGU), the Norwegian Water Resources and Energy Directorate (NVE), the International Centre for Geohazards (ICG; contribution no. 174) and the Norwegian University of Science and Technology (NTNU) for financial support in this project. In addition, we thank the Skanska Norge AS, which provided basis data like geotechnical reports and maps. Thanks also to Paula Utigard Sandvik (Archeological Museum, Stavanger), Helge Irgens Høeg (Høeg Pollen, Larvik) and Oystein Wiig (Zoological Museum, Oslo) who have determined the species of the terrestrial organic material, and Svend Funder (Geological Museum, Copenhagen) the mollusc shells. We thank John Dehls (NGU) for improving the language, and the journal reviewers Didier Perret (GSC Quebec) and Jan Aylsworth (GSC Ottawa) for very constructive comments.
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Solberg, IL., Hansen, L. & Rokoengen, K. Large, prehistoric clay slides revealed in road excavations in Buvika, mid-Norway. Landslides 5, 291–304 (2008). https://doi.org/10.1007/s10346-008-0122-7
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DOI: https://doi.org/10.1007/s10346-008-0122-7