The BGS Lexicon of Named Rock Units — Result Details

Whitecliff Chert Member

Computer Code: WHCH Preferred Map Code: WCh
Status Code: Full
Age range: Albian Age (KA) — Albian Age (KA)
Lithological Description: Glauconitic and calcareous sandstones with numerous horizons of lenticular cherts; mineralised surfaces, pebble beds and shell brash at several levels.
Definition of Lower Boundary: The lower boundary is placed at the base of sandstones with cherts at the hardground surface (Culverhole Hardground) overlying the Foxmould Member, below which chert is absent and calcareous sandstone doggers/lenses are common.
Definition of Upper Boundary: The upper boundary is placed at the hardground surface (Small Cove Hardground) at the top of the member where it is overlain by the Beer Head Limestone Formation of the Chalk Group.
Thickness: To 32m.
Geographical Limits: Devon and West Dorset. Mapped on Sheets 326 (Sidmouth) and 327 (Bridport): continuation on Sheet 311 (Wellington).
Parent Unit: Upper Greensand Formation (UGS)
Previous Name(s): Chert Beds (*642)
Alternative Name(s): none recorded or not applicable
Type Section  Whitecliff; cliff at Seaton Hole, 2km west of Seaton esplanade, Devon. Jukes-Browne and Hill, 1900, pp.195-197 and Plate. 
Woodward, H B and Ussher, W A E, 1911. Sidmouth and Lyme Regis. Memoir of the Geological Survey, Sheets 326 and 340 (England and Wales). 
Jukes-Browne, A J and Hill, W. 1900. The Cretaceous Rocks of Britain. 1. Gault and Upper Greensand. Memoir of the Geological Survey of Great Britain. 
Rhys, G H, Lott, G K, and Calver, M A. 1982. The Winterborne Kingston borehole, Dorset, England. Report of the Institute of Geological Sciences, No.81/3. 
De La Beche, H. 1826. Transactions of the Geological Society, Series 2, Vol.II, p.113. 
Edwards, R A, Gallois, R W and Hamblin, R J O. 2004. Geology of the Sidmouth district. Sheet Explanation of the British Geological Survey, Sheets 326 and 340 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used: