The BGS Lexicon of Named Rock Units — Result Details

London Clay Formation
Computer Code: LC Preferred Map Code: LC
Status Code: Full
Age range: Eocene Epoch (GE) — Eocene Epoch (GE)
Lithological Description: Fine, sandy, silty clay/silty clay. Glauconitic at base.
Definition of Lower Boundary: Rests unconformably on Woolwich and Reading Beds.
Definition of Upper Boundary: Drawn at base of Bagshot Formation.
Thickness: To 18m within Hitchin Sheet area but to 150m in London Basin (Essex).
Geographical Limits: London Basin.
Parent Unit: Thames Group (THAM)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Dowsetts Farm Borehole TL32SE/38 (for Hitchin Sheet, 221). (Type area, London Basin: for individual sections see King, 1981). 
Reference(s):
King, C. 1984. The stratigraphy of the London Clay Formation and Virginia Water Formation in the coastal sections of the Isle of Sheppey, (Kent, England). Tertiary Research, Vol.5, 121-158. 
Prestwich, J. 1846. The Isle of Wight Tertiaries. Quarterly Journal of the Geological Society, Vol.2, 223-259. 
Webster, T. 1814. Strata lying over the Chalk. Transactions of the Geological Society (1), Vol.2, p.187. 
Prestwich, J. 1850. The Lower Tertiary Strata. Quarterly Journal of the Geological Society, Vol.6, 252-281. 
Meyer, C J A. 1871. Lower Tertiary Deposits. Quarterly Journal of the Geological Society, Vol.27, 74-89. 
Davis, A G and Elliot, G F. 1951. The London Clay of Coastal Suffolk and Essex. Geological Magazine, Vol.88, 329-338. 
Hewitt, R A. 1988. The London Clay Formation (Eocene) of the country around Southend (Essex, England). Tertiary Research, Vol.10, 83-86. 
King, C. 1981. The stratigraphy of the London Clay and associated deposits. Tertiary Research Special Paper No.6. (Rotterdam: Backhuys.) 
Wrigley, A G. 1940. Faunal Succession in the London Clay. Proceedings of the Geologists' Association, Vol.51, 230-245. 
Smith, W, "In" Farey, J. 1811. General view of the agriculture and minerals of Derbyshire etc, Vol.1, p.111. 
Prestwich, J. 1847. London Clay. Quarterly Journal of the Geological Society, Vol.3, 354-377. 
Venables, E M. 1929. The London Clay of the Bognor District. Proceedings of the Geologists' Association, Vol.40, 41-51. 
Wrigley, A G. 1924. Faunal Divisions of the London Clay. Proceedings of the Geologists' Association, Vol.35, 245-259. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E240 E222 E256 E270 E284 E298 E299 E314 E283 E269 E221 E162 E285 E191 E206 E207 E208 E225 E223 E238 E239 E241 E254 E255 E257 E258 E259 E268 E267 E271 E272 E273 E274 E341 E342 E343
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