Pleistocene geology of the Palaeolithic sequence at Redhill, Thetford, Norfolk, England

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• 作者：P.L. Gibbard ; R.G. West ; A. Pasanen ; J.J. Wymer ; S. Boreham ; K.M. Cohen ; C. Rolfe
• 关键词：Little Ouse ; river ; fluvial ; Wolstonian ; artefacts
• 刊名：Proceedings of the Geologists' Association
• 出版年：2008
• 出版时间：2008
• 年：2008
• 卷：119
• 期：2
• 页码：175-192
• 全文大小：3239 K

文摘

The Pleistocene river terrace deposits in the Little Ouse valley at Redhill are described and related to earlier records. Lowestoft Formation (Anglian-age) glacial deposits underlie the interfluve area into which the valley was excavated, whilst the present valley is underlain by Holocene alluvial sediments beneath the modern river floodplain. The sediments beneath the Redhill terrace represent deposition in a gravel-bed braided-type stream. Ground Penetrating Radar (GPR) survey clarifies the internal structure, areal distribution and relation of the sediments to bedrock in the local area. The sediments are overlain by aeolian ‘cover sand’. The valley sides provided a source of chalk and flint, the latter exploited locally by Palaeolithic humans, as indicated by the prolific finds of palaeoliths from the sediments. Contemporaneous periglacial conditions are indicated by putty chalk, silty sand and associated sharp flint pebbles and diamicton-like coarse gravel with highly angular clasts, which was interbedded with the fluvial sediment. These materials, together with the artefacts, were soliflucted onto the river braidplain. The Redhill artefact assemblage includes Late Middle Acheulian pointed and sub-cordate hand-axes. Comparison of the artefact and vertebrate assemblages with those from the River Thames' sequence shows a striking similarity to those recovered from the Lynch Hill/Corbets Tey Member (late Middle Pleistocene Wolstonian Stage; Marine Isotope Stages 10–8). This appears to represent a significant period of human occupation of lowland Britain.