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Geological Society, London, Engineering Geology Special Publications; 1997; v. 12; p. 201-209;
DOI: 10.1144/GSL.ENG.1997.012.01.18
© 1997 Geological Society of London

Section 3: Site Investigation

Resistivity sounding: two case studies from the Cretaceous Chalk at Boxgrove, West Sussex and Barnham, Suffolk, UK

C. L. Roberts1 & S. G. Lewis2

1 School of Applied Sciences, University of Wolverhampton, Wulfruna Street, Wolverhampton WV1 1SB, UK
2 Department of Geography and Geology, Cheltenham and Gloucester College of Higher Education, Francis Close Hall, St. Paul’s Road, Cheltenham GL50 4AZ, UK

Resistivity sounding is successfully used to determine depth to Cretaceous Chalk bedrock at two contrasting sites. The trend of a buried cliff-line is highlighted at Boxgrove, where the ancient cliff is modelled at around 40 m O.D. with a seaward Chalk platform between 35 m and 40 m O.D. At Barnham, the configuration of a Middle Pleistocene glacial river channel is constrained and resistivity variations in response to lithological changes noted. Solid Cretaceous Chalk reveals a resistivity value of 105 ohmm, rising to 130–142 ohmm at weathered horizons.