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Borehole Survey at Hinkley Point C Shurton Entries Geoarchaeological Survey

Payne, Richard ; Brown, Alex ; Young, Daniel

Archaeology Data Service 2021

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  • Título:
    Borehole Survey at Hinkley Point C Shurton Entries Geoarchaeological Survey
  • Autor: Payne, Richard ; Brown, Alex ; Young, Daniel
  • Assuntos: Archaeology ; Grey Literature
  • Descrição: Wessex Archaeology (WA) was commissioned by WSP to produce a report on the geoarchaeological borehole survey and deposit modelling that were undertaken to support proposals by the National Grid (NG) to construct ten new towers at Shurton (Somerset) connecting a proposed new substation to the existing power infrastructure. These proposals form part of the Hinkley Point C Connection Project, which is developing a new 400kV connection between Bridgwater, Somerset and Seabank, Avonmouth. The peat deposits at the Site have the potential to represent an important palaeoenvironmental record for this area of the Severn Estuary, located close to the wetland/dryland interface in an area of known prehistoric human activity. Peat deposits are also archaeologically significant, with the potential to preserve a wide range of waterlogged prehistoric archaeological remains, as evidenced by the nationally significant Neolithic and Bronze Age timber trackways and platforms of the Somerset Levels (Coles and Coles 1986). By contrast, the mineral-rich (e.g. sandy, silty or clayey) lower and upper alluvium in general have a low geoarchaeological and archaeological potential, except where they contain richly organic units or are located within or at the interface with the intervening peat unit. Here, the alluvium has potential for microfossil assessment/analysis, investigating the marine and or freshwater influence at the Site and potentially providing important reference points for studies of relative sea level rise (RSL) in the Severn Estuary. The majority of the peat at the Site is likely to be too deeply buried to archaeologically evaluate, being a minimum of 1.6m below ground level (bgl) but generally greater than 2.3m bgl. However, in order to mitigate against the impact of the development on these deposits, a targeted programme of palaeoenvironmental assessment is recommended on boreholes WA-JP4 and WA-JP5. The aim of this assessment would be to undertake a programme of rangefinder radiocarbon dating to establish a chronology for the peat deposits, and to determine the state of preservation of key palaeoenvironmental remains. This work will establish the potential of the deposits to contribute to the specific research objectives, informing on the need for and scope of further paleoenvironmental analysis and scientific dating.
  • Editor: Archaeology Data Service
  • Data de criação/publicação: 2021
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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