The BGS Lexicon of Named Rock Units — Result Details

Headon Formation

Computer Code: HE Preferred Map Code: notEntered
Status Code: Full
Age range: Bartonian Age (GB) — Bartonian Age (GB)
Lithological Description: The basal 8.6m (formerly Lower Headon Beds) comprise pale greenish grey clays, some of which contain freshwater shells. Some sands are present and carbonaceous clays and lignite occur toward the base. The middle 10m (formerly Middle Headon Beds, renamed Lyndhurst Member) consists of grey brown and greeniss grey clays and sands with some lignite and freshwater limestone. The highest beds (Upper Headon Beds) comprise pale greenish grey clays and sand.
Definition of Lower Boundary: Underlain by Becton Sand of the Barton Group.
Definition of Upper Boundary: Overlain by Bembridge Limestone Formation.
Thickness: 65m
Geographical Limits: Hampshire, England.
Parent Unit: Not Available (!)
Previous Name(s): Headon Beds (-3461)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Cliff section Whitecliff Bay, Isle of Wight White, H J O.1921. A short sccount of the geology of the Isle of Wight. Memoir of the Geological Survey of Great Britain, (England and Wales) (London, HMSO). 
Type Section  Cliff sections at Headon Hill. White, H J O.1921. A short account of the geology of the Isle of Wight. Memoir of the Geological Survey of Great Britain, (England and Wales) (London, HMSO). 
Reference(s):
Edwards, R A and Freshney, E C. 1987. Lithostratigraphical classification of the Hampshire Basin Palaeogene Deposits (Reading Formation to Headon Formation) Tertiary Research, Vol.8, 43-73. 
Hooker, J J. 1975. Reports of a field meeting to Hengistbury Head and adjacent areas, Dorset, with an account of published work and some new exposures. Tertiary Times, Vol.2, 109-121. 
White, H J O. 1921. A short account of the geology of the Isle of Wight. Memoir of the Geological Survey of Great Britain, (1994 reprint). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E314 E315 E329 E330 E331