The Middle Pleistocene terraces of the central Waveney valley,Earsham, south Norfolk,UK |
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| Authors: | Philippa Holmes James Rose Jonathan R Lee Rene Barendregt Ian Candy James B Riding Mark Lewis |
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| Institution: | 1. Department of Geography, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK;2. British Geological Survey, Keyworth, Nottingham NG12 5GG, UK;3. The University of Lethbridge, Lethbridge, Alberta, TK1 3M4, Canada;4. Department of Earth Sciences, The Natural History Museum,Cromwell Road, London SW7 5BD, UK |
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| Abstract: | Although substantial work has been done on the pre-glacial terraces of East Anglia, very little systematic work has been done to understand the origin of river terraces in East Anglia that have formed since ice last covered the region. This paper records the results of studies of exposures and borehole records in ‘classical’ Quaternary terrace landforms that are considered to have formed since the Anglian (MIS 12) Glaciation, in the middle Waveney Valley. These features have been examined in terms of their morphological and sedimentological properties, in order to provide a detailed record of their form and composition, understand their processes of formation, and identify their stratigraphical status. The results show that the main body of the highest terrace (Homersfield Terrace, Terrace 3) is not composed of river sediments, but of shallow marine sediments, and is a remnant of early Middle Pleistocene Wroxham Crag. River sediments, in the form of Anglian age (MIS 12) glaciofluvial Aldeby Sands and Gravels also exist in the area as a channel fill, cut through the Wroxham Crag, and reflect outwash erosion and sedimentation from a relatively proximal ice margin to the west. The results mean that the interpretations previously presented for the terrace landforms of the middle Waveney valley are not applicable. The issue of why the terrace stratigraphy, hitherto identified in East Anglia cannot be related to that for the River Thames to the south and the rivers of Midland England to the west, still requires further research. |
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| Keywords: | Wroxham Crag Middle Pleistocene Lowestoft Till Aldeby Sand and Gravel Anglian Glaciation glaciofluvial outwash Norfolk UK |
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