1. Anon 1993. Low rise buildings on shrinkable clay soils: Part 1. BRE Digest 240. Building Research Establishment, Watford.
2. The Claygate Beds of Essex.;Proceedings of the Geologists' Association,,1980
3. Cooper, J. 1976. British Tertiary stratigraphical and rock terms formal and informal, additional to Curry 1958, Lexique Stratigraphique International. Tertiary Research Special Paper No. 1, Tertiary Research Group.
4. Regional geological and geotechnical survey of south Essex.;Bulletin of the International Association of Engineering Geology,,1979
5. Curry, D., Adams, C. G., Boulter, M. C., Dilley, F. C., Eames, F. E., Funnell, B. M. & Wells, M. K. 1978. A Correlation of Tertiary rocks in the British Isles. Geological Society, London, Special Report 12.