The BGS Lexicon of Named Rock Units — Result Details

Whitchurch Sand Formation

Computer Code: WHS Preferred Map Code: WhS
Status Code: Full
Age range: Valanginian Age (KV) — Valanginian Age (KV)
Lithological Description: White, buff, yellow, orange and red to dark brown, generally unconsolidated fine- to medium-grained sand, with seams and irregular masses of limonite-cemented sandstone and rare siliceous or calcareous concretions, localized beds of grey to white silt and clay or mudstone, and rare ooidal limonitic ironstone.
Definition of Lower Boundary: The base is an unconformable contact with sands of the Whitchurch Sand Formation resting on limestone, calcareous sandstone or calcareous mudstones of the Haddenham Formation (formerly the Purbeck Limestone Formation) or on fossiliferous limestones or calcareous sandstones of the Portland Group, or rarely on mudstones or siltstones of the Kimmeridge Clay Formation.
Definition of Upper Boundary: The upper boundary is a discordant contact between the sands of the formation and overlying coarse gritty sandstones of the Lower Greensand Group, or calcareous mudstones of the Gault Formation. Mostly occurs as outliers without any succeeding strata.
Thickness: To 20m.
Geographical Limits: Outliers in the Aylesbury to Oxford area, Swindon and in the Vale of Pewsey near Devizes, Wiltshire (Casey and Bristow, 1964; Horton et al., 1995).
Parent Unit: Wealden Group (W)
Previous Name(s): Portland Purbeck (-2533)
Shotover Ironsands (-3762)
Portland Group (PL)
Shotover Sands (-1274)
Purbeck Group (PB)
Lower Greensand Group (LGS)
Whitchurch Sands (-4974)
Shotover Sands/Shotover Iron Sands [Obsolete Name And Code: Use WHS] (SHS)
Lower Greensand (-1024)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Monks Farm Pit, Risinghurst, Shotover Hill, Oxford. Horton et al., 1995, p.87. 
Type Area  Oxford to Aylesbury area, Shotover Hill to Whitchurch and the Oving Hills, Buckinghamshire and Oxfordshire. Casey and Bristow, 1964; Horton et al., 1995. 
Type Section  Temporary trench section, Whitchurch, Bucks. Casey and Bristow, 1964, 119-120. 
Reference(s):
Casey, R and Bristow, C R. 1964. Notes on some ferruginous strata in Buckinghamshire and Wiltshire. Geological Magazine, Vol.101, 116-128. 
Horton, A, Sumbler, M G, Cox, B M and Ambrose, K, 1995. Geology of the country around Thame. Memoir of the British Geological Survey, Sheet 237 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E220 E237 E252 E282 E219