The BGS Lexicon of Named Rock Units — Result Details
Kellaways Clay Member
| Computer Code: | KLC | Preferred Map Code: | KlC |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Callovian Age (JC) — Callovian Age (JC) | ||
| Lithological Description: | Silicate mudstone, grey, commonly smooth in basal part (see Previous Names), but more generally silici-silty or silici-sandy, locally with thin beds of siltstone and sandstone, and nodules of argillaceous limestone. | ||
| Definition of Lower Boundary: | Generally sharp, conformable or non-sequential junction with bioclastic limestone of the underlying Cornbrash Formation overlain by grey mudstone. Commonly a thin bioclastic unit of shell-fragmental, more or less sandy mudstone occurs at the base (where this is more strongly cemented it is included in the Cornbrash Formation). | ||
| Definition of Upper Boundary: | Transitional junction; boundary drawn at the base of the lowest substantial sandstone/siltstone unit of the overlying Kellaways Sand Member resting on the predominantly mudstone succession. | ||
| Thickness: | 0 to perhaps (in south Dorset) c. 50 m; typically c. 20 m in the Wessex Basin, and 2 to 3 m on the East Midlands Shelf. | ||
| Geographical Limits: | Dorset coast (Weymouth area) to the Market Weighton High. Extensive in onshore outcrop, though absent over the interior of the London Platform. | ||
| Parent Unit: | Kellaways Formation (KLB) | ||
| Previous Name(s): | Kellaways Clay Member plus Cayton Clay Formation [Obsolete Name and Code: Use KLC]
(-2267)
Kellaways Clay (-997) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Reference Section | BGS Walks Farm Borehole, 2.5km northnortheast of Heckington near Sleaford, Lincolnshire. (TF14NE/18). 96.60 to 98.37m depth. Berridge et al., 1990, p.80. | ||
| Type Area | Area around hamlet of Kellaways, near Chippenham, Wilts. | ||
| Reference Section | BGS Tytherton No.3 Borehole, 3.6km east of Chippenham, Wiltshire. (ST 97 SW/2) 6.95 to 24.27m depth. Full sequence proved. Cave and Cox, 1975. | ||
| Reference Section | Tytherton No.2 Borehole, 28.75 to 44.58m. | ||
| Reference Section | Clay Pits, Yaxley and Fletton (Callomon, 1968, p.277-280). | ||
| Reference(s): | |||
| Page, K N. 1989. A stratigraphic revision for the English Lower Callovian. Proceedings of the Geologists' Association, Vol.100, 363-382. | |||
| 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. 1933. The Jurassic System in Great Britain (Oxford: Clarendon Press.) | |||
| 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. | |||
| Berridge, N G, Pattison, J, Samuel, M D A, Brandon, A, Howard, A S, Pharaoh, T C, and Riley, N J. 1999. Geology of the Grantham district. Memoir of the British Geological Survey, sheet 127 (England and Wales). | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E080 E089 E127 E158 E102 E237 E103 E115 E128 E143 E144 E157 E171 E203 E172 E186 E236 E251 E252 E265 E219 E281 E217 | |||