The BGS Lexicon of Named Rock Units — Result Details

Barton Group

Computer Code: BA Preferred Map Code: notEntered
Status Code: Full, pending ratification
Age range: Lutetian Age (GL) — Priabonian Age (GI)
Lithological Description: Yellow weathering, green-grey clay, with discrete fine-grained sand bands, yellow-pale grey weathering fine-grained sand, green-grey, sandy clay and clayey, silty fine-grained sand.
Definition of Lower Boundary: Drawn at base of clay and flint pebbles of the Barton Clay where it rests conformably on grey-brown sand of the Selsey Sand.
Definition of Upper Boundary: Drawn at conformable upward passage from black clays of the Belton Sand to pale green clays of the Headon Formation.
Thickness: Approximately 175 metres.
Geographical Limits: Hampshire, England.
Parent Unit: Not Applicable (-)
Previous Name(s): Barton Formation (-35)
London Clay (-3811)
Barton Beds (-665)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Sea cliffs from Cliff End, 1km east of Mudeford, to Paddy's Gap near Milford, Hampshire, England. 
Type Area  Sea cliffs at Highcliffe and Barton, Hampshire, England. 
Reference(s):
Melville, R V and Freshney, E C. 1982. British Regional Geology: the Hampshire Basin and adjoining areas (4th Edition).(London ,HMSO for Institute of Geological Sciences). 
Freshney, E C, et al. 1990. The boundary between the Selsey Sand and Barton Clay Formations, at Whitecliffe Bay, Isle of Wight. Tertiary Research, Vol. 12 (2), p.65-68. 
Prestwich, J, 1847. On the probable age of the London Clay, etc. Quarterly Journal of the Geological Society, Vol.3, p.354-409. 
Burton, E St.J, 1929. The horizons of Bryozoa (Polyzoa) in the Upper Eocene beds of Hampshire. Quarterly Journal of the Geological Society, Vol.85, p. 223-239. 
Edwards, R A and Freshney, E C. 1987. Geology of the country around Southampton. Memoir of the British Geological Survey, Sheet 315 (England and Wales). 
Prestwich, J, 1857. On the correlation of the Eocene Tertiaries of England, France, and Belgium. Quarterly Journal of the Geological Society, Vol.13, p.108. 
Gardner, J S, Keeping, H and Monckton, H W, 1988. The Upper Eocene, comprising the Barton and Upper Bagshot Formations. Quarterly Journal of the Geological Society, Vol.44, p.578-635. 
Reid, C, 1898. Bournemouth. Memoirs of the Geological Survey of Great Britain. 
Burton, E St.J, 1933. Faunal horizons of the Barton Beds in Hampshire. Proceedings of the Geologists' Association, Vol.44, p.131-167. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E269 E284