The BGS Lexicon of Named Rock Units — Result Details

St Ann's Hill Pebble Bed

Computer Code: SAHP Preferred Map Code: SaP
Status Code: Index Level
Age range: Ypresian Age (GY) — Ypresian Age (GY)
Lithological Description: The St Ann's Hill Pebble Bed comprises a unit of cross-bedded gravelly sand and gravel, some imbricated. The clasts are well-rounded black flint gravel and cobbles generally between 2 and 10cm in diameter (Ellison and Williamson, 1999).
Definition of Lower Boundary: none recorded or not applicable
Definition of Upper Boundary: none recorded or not applicable
Thickness: Up to about 3.5m thick
Geographical Limits: The St Ann’s Hill Pebble Bed occurs locally in Surrey, just north-west of Chertsey.
Parent Unit: Bagshot Formation (BGS)
Previous Name(s): St Anne's Hill Pebble Bed Member (-4313)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Previously exposed in an old gravel pit on the south side of St Ann’s Hill. Ellison and Williamson, 1999. 
Reference(s):
Aldiss, D.T., 2012. The stratigraphical framework for the Palaeogene successions of the London Basin, UK. British Geological Survey Open Report OR/12/004. Available from http://nora.nerc.ac.uk/17121/. 
Dewey, H, and Bromehead, C E N. 1915. The geology of the country around Windsor and Chertsey. Memoir of the Geological Survey of Great Britain, Sheet 269 (England and Wales). 
Dewey, H, and Bromehead, C E N. 1921. The geology of the South London. Memoir of the British Geological Survey, Sheet 270 (England and Wales). 
Whitaker, W. 1872. The geology of the London Basin, Part I. The Chalk and the Eocene beds of the southern and western tracts. Memoir of the Geological Survey of England and Wales, Vol. IV. 
Ellison, R A and Williamson, I T. 1999. Geology of the Windsor and Bracknell district - a brief explanation of the geological map. Sheet Explanation of the British Geological Survey. 1:50 000 Sheet 269 Windsor (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E269