The BGS Lexicon of Named Rock Units — Result Details
Strangways Formation
Computer Code: | STRW | Preferred Map Code: | notEntered |
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Status Code: | Full | ||
Age range: | Bajocian Age (JB) — Bathonian Age (JN) | ||
Lithological Description: | The formation comprises predominantly sandstones with interbedded siltstones, mudstones and occasional limestones. Sandstones are pale grey to white, poorly to well cemented, very fine- to medium-grained, occasionally glauconitic and carbonaceous. Interbedded mudstones are pale green-grey, dark grey or variegated. Limestones are grey, buff or cream, micritic, oolitic or bioclastic. | ||
Definition of Lower Boundary: | The lower boundary is characterised by a change from sandstones to dominantly mudstones (Wroot Formation) and a corresponding down-section increase in gamma values and decrease in velocity. | ||
Definition of Upper Boundary: | The top of the formation is marked by a sharp downward change from variegated mudstones (Hudleston Formation) to sandstones or siltstones with interbedded mudstones. The lithological change coincides with a down-section decrease in gamma-ray values and, usually, an increase in velocity. | ||
Thickness: | Up to 150 m. | ||
Geographical Limits: | Southern North Sea Basin (quadrants 41-43, 46-48, 51-52). | ||
Parent Unit: | West Sole Group (WSTS) | ||
Previous Name(s): | West Sole Group
(WSTS)
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Alternative Name(s): | Ellerick Formation Werkendam Shale Formation Lincolnshire Limestone Formation Cloughton Formation Glentham Formation [Obsolete: use BWL, BWC, RLD] Scarborough Formation Pentland Formation |
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Stratotypes: | |||
Type Section | North Sea well 47/03b- 4 between 979 and 1117 m (Lott and Knox, 1994). | ||
Reference Section | North Sea well 42/24- 1 between 328 and 369 m (Lott and Knox, 1994). | ||
Reference Section | North Sea well 47/10- 1 between 1538.5 and 1671 m (Lott and Knox, 1994). | ||
Reference Section | North Sea well 48/03- 3 between 995 and 1137 m (Lott and Knox, 1994). | ||
Reference(s): | |||
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. | |||
Lott, G K and Knox, R W O'B. 1994. 7. Post-Triassic of the Southern North Sea. In: Knox, R W O'B and Cordey, W G (eds.) Lithostratigraphic nomenclature of the UK North Sea. British Geological Survey, Nottingham. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
none recorded or not applicable |