The BGS Lexicon of Named Rock Units — Result Details

Kellaways Sand Member

Computer Code: KLS Preferred Map Code: KlS
Status Code: Full
Age range: Callovian Age (JC) — Callovian Age (JC)
Lithological Description: Silicate sandstone and silicate siltstone, pale grey, calcareous cemented, with interbeds of sandy and silty mudstone. Sandstone/siltstone generally weakly cemented, but locally strongly cemented, typically into "doggers".
Definition of Lower Boundary: Transitional junction; boundary drawn at the base of the lowest substantial sandstone/siltstone unit resting on the predominantly mudstone succession of the underlying Kellaways Clay Member.
Definition of Upper Boundary: Generally sharp but conformable junction between sandstone/siltstone and mudstone of the overlying Oxford Clay Formation; in expanded successions (Wessex Basin), arbitary boundary drawn at the top of the highest substantial sandstone or sandy mudstone, above which the succession is predominantly mudstone; in the Market Weighton area, sharp disconformable contact with chalky argillaceous sediments of the Chalk Group/Hunstanton Formation.
Thickness: 0 to c.10m; typically c.3 to 5m on the East Midland Shelf; thin or absent over much of Dorset.
Geographical Limits: Dorset coast (Weymouth area) to the Malton area of Yorkshire (just north of the Market Weighton High). Extensive in onshore subcrop, though absent over the interior of the London Platform.
Parent Unit: Kellaways Formation (KLB)
Previous Name(s): Kellaways Sand Member Plus Kellaways Rock Member (-348)
Kellaways Rock [Obsolete Name And Code: See KLS] (KLR)
Kellaways (Or Kellaway) Rock (-4128)
Kellaways (Or Kellaway) Stone (-998)
Kellaways Sand (-999)
Kellaways Sand Plus Cave Rock Member (-1000)
Kellaways Sand Plus Kellaways Rock (-2269)
Alternative Name(s): none recorded or not applicable
Reference Section  BGS Tytherton No.2 Borehole, 2.7km eastnortheast of Chippenham, Wiltshire. ST 97 SE/1, 26.01m to 28.75m depth. Full sequence proved. Cave and Cox, 1975. 
Reference Section  Tytherton No.3 Borehole, 3.35m to 6.95m 
Reference Section  Clay Pits, Yaxley and Fletton, (Callomon, 1968, p.277-280). 
Type Area  Area around the hamlet of Kellaways, and the banks of the River Avon at Kellaways Bridge, 2 miles northeast of Chippenham, Wiltshire (Woodward, 1895, p.29). 
Type Section  Banks of River Avon, from hamlet of Kellaways to Tytherton Lucas, Wiltshire. Base and top, and intervening strata seen in discontinuous exposures. Thickness unknown. Cave and Cox. 1975. Cox and Sumbler, 2002. 130-134. 
Cave, R and Cox, B M. 1975. The Kellaways Beds of the area between Chippenham and Malmesbury, Wiltshire. Bulletin of the Geological Survey of Great Britain, No.54, 41-46. 
Cox, B M and Sumbler, M G. 2002. British Middle Jurassic Stratigraphy. Geological Conservation Review Series No.26. [Peterborough: Joint Nature Conservation Committee.] 
Arkell W J, 1933. The Jurassic System in Great Britain [Oxford: Clarendon Press.] 
Ussher, W A E, Jukes-Browne, A J and Strahan, A. 1888. The Geology of the country around Lincoln. Memoir of the Geological Survey of Great Britian. Old Series (Sheet 83). 
Gaunt, G D, Fletcher, T P and Wood, C J. 1992. Geology of the country around Kingston upon Hull and Brigg. Memoir of the British Geological Survey, sheets 80 and 89 (England and Wales). 172pp. 
Page, K N. 1989. A stratigraphic revision for the English Lower Callovian. Proceedings of the Geologists' Association, Vol.100, 363-382. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E127 E080 E089 E158 E128 E144 E102 E237 E064 E072 E103 E115 E143 E157 E171 E203 E172 E186 E236 E251 E252 E265 E219