The BGS Lexicon of Named Rock Units — Result Details

Fontmell Magna Sand

Computer Code: FMS Preferred Map Code: FMS
Status Code: Index Level
Age range: Albian Age (KA) — Albian Age (KA)
Lithological Description: Fine-grained, clayey, weakly calcareous sand and sandstone.
Definition of Lower Boundary: The base is marked by the upward change from sandy clay of the Gault Formation into the sand of this unit.
Definition of Upper Boundary: The top is marked by the upward change from sand into sandy clay of the Gault Formation.
Thickness: 0 to 5m.
Geographical Limits: A limited area around Fontmell Magna, Dorset (ST 867 170) (Shaftesbury Sheet 313). This deposit is not described in the Stratigraphical Framework document and is considered to be of bed status because of its limited outcrop.
Parent Unit: Gault Formation (GLT)
Previous Name(s): Fontmell Magna Sand Member (-1543)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Temporary section at the northern end of Fontmell Magna. See Bristow et al. (1995, p.96). 
Reference(s):
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 and Owen, H G. 1991. A temporary section in the Gault at Fontmell Magna, North Dorset. Proceedings of the Dorset Natural History and Archaeological Society, Vol.112, 95-97. 
Hopson, P M, Wilkinson, I P and Woods, M A. 2008. A stratigraphical framework for the Lower Cretaceous of England. British Geological Survey. British Geological Survey Research Report, RR/08/03. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E313