The BGS Lexicon of Named Rock Units — Result Details
Kellaways Formation
| Computer Code: | KLB | Preferred Map Code: | Kys |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Callovian Age (JC) — Callovian Age (JC) | ||
| Lithological Description: | Mudstone, grey, commonly silici-silty or silici-sandy, with (predominantly in the upper part) beds of generally calcareous siltstone and sandstone. | ||
| Definition of Lower Boundary: | Generally sharp, conformable or non-sequential junction with bioclastic limestone of underlying Cornbrash Formation, overlain by grey mudstone, commonly a thin unit of shell-fragmental, more or less sandy mudstone occurs at base (where this is more strongly cemented it is included in the Cornbrash Formation). | ||
| Definition of Upper Boundary: | Generally sharp but conformable junction between sandstone/siltstone in upper part of formation with mudstone of overlying Oxford Clay Formation; in expanding successions, (Wessex Basin), arbitrary 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 perhaps (in south Dorset) 50 m; typically c. 20 m in the Wessex Basin, and c. 5 to 8 m on the East Midlands Shelf. | ||
| Geographical Limits: | Dorset coast (Weymouth area) to Malton area, Yorkshire (just north of the Market Weighton High). Extensive in onshore subcrop, though absent over the interior of the London Platform. | ||
| Parent Unit: | Ancholme Group (AMG) | ||
| Previous Name(s): | Kellaways Beds [Obsolete Name and Code: Use KLB]
(-347)
Kellaways Rock plus Kellaways Clay [Obsolete Name and Code: Use KLB] (-4730) Kellaways Formation plus Cayton Clay Formation [Obsolete Name and Code: Use KLB] (-2266) Kellaways Beds Formation (-996) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Reference Section | 'Fault Corner', Grange Top Quarry, Ketton, Rutland. Fully exposed, 8.50 m thick (Hudson and Clements, 2007, p.258-259). | ||
| Type Section | BGS Tytherton No.3 Borehole, 2.7 km eastnortheast of Chippenham, Wiltshire. ST 97SW/2, 3.35 to 24.27 m depth. Top of formation not seen (Cave and Cox, 1975). | ||
| Type Area | Kellaways, near Chippenham, Wiltshire. | ||
| Reference Section | BGS Walks Farm Borehole, 2.5 km northnortheast of Heckington, near Sleaford, Lincolnshire. TF14 NE/18. 91.60 to 98.37 m depth (Berridge et al., 1999 and manuscript log of borehole TF/4NE/18 in BGS Archive). | ||
| Reference(s): | |||
| Smith, W. 1817. Strata identified by organized fossils, Part 3. [London.] | |||
| 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. | |||
| Judd, J W. 1875. The geology of Rutland and parts of Lincoln, Leicester, Northampton, Huntingdon and Cambridge. Memoir of the Geological Survey of Great Britain (Old Series sheet 64). | |||
| Waters, C N, Smith, K, Hopson, P M, Wilson, D, Bridge, D M, Carney, J N, Cooper, A H, Crofts, R G, Ellison, R A, Mathers, S J, Moorlock, B S P, Scrivener, R C, McMillan, A A, Ambrose, K, Barclay, W J, and Barron, A J M. 2007. Stratigraphical Chart of the United Kingdom: Southern Britain. British Geological Survey, 1 poster. | |||
| 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. | |||
| Arkell, W J. 1933. The Jurassic System in Great Britain (Oxford: Clarendon Press.) | |||
| Hudson, J D and Clements, R G. 2007. The Middle Jurassic Succession at Ketton, Rutland. Proceedings of the Geologists' Association, Vol 118, 239-264. | |||
| 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: | |||
| E102 E114 E127 E159 E171 E172 E187 E188 E202 E203 E204 E217 E218 E219 E220 E236 E237 E253 E266 E268 E281 E327 E341 E342 E343 E064 E072 E080 E081 E089 | |||