Watson, N. (2017). LYMINSTER BYPASS, LYMINSTER, WEST SUSSEX: GEOARCHAEOLOGICAL DESK-BASED ASSESSMENT. ARCA. https://doi.org/10.5284/1097359. Cite this using datacite

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Title:		 LYMINSTER BYPASS, LYMINSTER, WEST SUSSEX: GEOARCHAEOLOGICAL DESK-BASED ASSESSMENT
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Series:		 ARCA unpublished report series
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arca1-505624_187890.pdf (9 MB) : Download
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https://doi.org/10.5284/1097359
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Publication Type:		 Report (in Series)
Abstract
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Abstract:		 Borehole survey A geoarchaeological desk-based assessment was carried out of geotechnical records collected along the route and British Geological Survey (BGS) records in the vicinity of the proposed A284 Lyminster Bypass, West Sussex. Locational and lithological data were extracted from these records and transferred to a RockWorks 15 database. Lithologies were interpreted and placed into formal BGS stratigraphic categories using the appropriate BGS maps. The bedrock underlying the proposed route of the Bypass sub-crops at +2m OD along most of the route and comprises rock of the White Chalk Group. Deposits on the Reading Formation may outcrop at the extreme north end of the route. The relatively flat Chalk superface is probably a result of marine planation in the Middle Pleistocene/early Upper Pleistocene. BGS mapping suggests that raised beach deposits, which are here attributed to the Pagham Formation, sit on the planation surface and extend to the present ground surface. The Pagham Formation is of Ipswichian interglacial age (123- 130,000 BP), a time when humans were absent from Britain. However, the lithological data from the geotechnical survey are equivocal with regards formation processes of the mapped raised beach deposits. A palaeochannel of c. 21m depth is cut into the Chalk in the Black Ditch and filled with fine-grained fossiliferous deposits. The BGS map the fills as intertidal deposits of Holocene age. The c. -19.5m OD lower contact of the fine-grained fills with the underlying Chalk suggests flow through the channel either in the Early Holocene, or during the Ipswichian/Middle Pleistocene. The Quaternary deposits along the route of the proposed Lyminster bypass are presently assessed as of moderate (palaeochannel fills) to low (raised beach) archaeological, and high (palaeochannel fills) to moderate (raised beach) palaeoenvironmental potential. However, a geoarchaeological borehole survey is recommended both to clarify interpretations presently made on the basis of relatively low detail geotechnical description and refine the assessments made in this report.
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Author:		 Nick Watson
Publisher
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Publisher:		 ARCA
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Year of Publication:		 2017
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Locations:
Parish: Lyminster and Crossbush
District: Arun
Country: England
County: West Sussex
Grid Reference: 502880, 105221 (Easting, Northing)
Subjects / Periods
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Subjects / Periods:
BOREHOLE SURVEY (Event)
ALLUVIUM (Object England)
UNCERTAIN ALLUVIUM (Tag)
UNCERTAIN (Historic England Periods)
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OASIS Id: arca1-505624
Report id: 1617-16
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Created Date
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Created Date:		 18 Jul 2022