The BGS Lexicon of Named Rock Units — Result Details

Sandsfoot Formation

Computer Code: SDT Preferred Map Code: Sft
Status Code: Full
Age range: Oxfordian Age (JO) — Oxfordian Age (JO)
Lithological Description: A variable unit ranging from sand-free clay through clayey fine-grained sand, to sand, ferruginous sandstone and limonitic oolite.
Definition of Lower Boundary: Upward change from limestones of the Clavellata Formation into silicaclastic beds or limonitic oolite.
Definition of Upper Boundary: Upward change from sands, clayey sands and, locally, limonitic oolite to smooth mudstone of the Ringstead Waxy Clay/Ampthill Clay/Kimmeridge Clay.
Thickness: 2 to 12m
Geographical Limits: Dorset to Wiltshire, and probably other areas too.
Parent Unit: Corallian Group (CR)
Previous Name(s): Glos Oolite Series (-4321)
Upper Calcareous Grit (-1171)
Sandsfoot Beds (-518)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Cliff section below Sandsfoot Castle, Weymouth. 
Reference(s):
Woodward, H B. 1895. the Jurassic Rocks of Britain. The Middle and Upper Oolitic rocks of England (Yorkshire excepted). Vol.5. Memoir or the Geological Survey of the United Kingdom. 
Arkell, W J. 1947. Geology of the country around Weymouth, Swanage, Corfe and Lulworth. Memoir of the British Geological Survey. Sheets 341, 342, 343 and small portions of sheets 327, 328 and 329 (England and Wales). 
Arkell W J, 1933. The Jurassic System in Great Britain [Oxford: Clarendon Press.] 
Blake, J F and Huddleston, W H 1877. On the Corallian rocks of England. Quarterly Journal of the Geological Society of London, Vol.33, 260-405. 
Strahan, A. 1898. The Geology of the Isle of Purbeck and Weymouth. Memoir of the Geological Survey of England and Wales, 278pp. [HMSO.] 
Bristow, C R, Barton, C M, Freshney, E C, Wood, C J, Evans, D J, Cox, B M, Ivimey-Cook, H C, and Taylor, R T. 1995. Geology of the country around Shaftesbury. Memoir of the British Geological Survey, Sheet 313 (England and Wales). 
Bristow, C R, Barton, C M, Freshney, E C, Wood, C J, Evans, D J, Cox, B M and Woods, M A. 1999. The Wincanton district - a concise account of the geology. Memoir of the British Geological Survey, Sheet 297 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E313 E297 E281 E341 E342 E343 E327