The BGS Lexicon of Named Rock Units — Result Details
Blea Wyke Sandstone Formation
| Computer Code: | BW | Preferred Map Code: | BWS |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Toarcian Age (JT) — Toarcian Age (JT) | ||
| Lithological Description: | Sandstone and siltstone, micaceous, fine-grained, grey-weathering and argillaceous in lower part, yellow-weathering and silty in upper part. In the Rosedale, Farndale, Fryup Dale and Danby Dale area, includes thin beds of ooidal ironstone at the top and between the grey and yellow sandstone and siltstone units (see Supplementary Information). | ||
| Definition of Lower Boundary: | Gradational; rapid upward transition from dark grey mudstone of the Whitby Mudstone Formation to paler burrow-mottled silt- and sand-rich sediment. | ||
| Definition of Upper Boundary: | Unconformity: base of ferruginous, pebbly sandstone of the Dogger Formation (Middle Jurassic) on ooid-ironstone beds of Rosedale Ironstone Member (Rosedale area) or yellow-weathering fine-grained sandstone of Yellow Sandstone Member (Ravenscar area). | ||
| Thickness: | 15.6 to 18.0 m at Ravenscar, generally up to about 10 m in Rosedale area, locally possibly up to 25 m. | ||
| Geographical Limits: | Restricted to two separate areas: the Rosedale, Farndale, Fryup Dale and Danby Dale area in the North York Moors, and the 'Peak Trough' on the North Yorkshire coast where it crops out onshore only on the foreshore and cliffs between Peak Steel and Blea Wyke Point, Ravenscar. | ||
| Parent Unit: | Lias Group (LI) | ||
| Previous Name(s): | Blue Wick Sands [Obsolete Name and Code: Use BW]
(-2034)
Serpula Beds [Obsolete Name and Code: Use BW] (-2035) Blea Wyke Series [Obsolete Name and Code: Use BW] (-2651) Upper Lias (part) [Obsolete Name and Code: Use BW] (-2652) Serpula Series [Obsolete Name and Code: Use BW] (-3259) Blea Wyke Beds [Obsolete Name and Code: Use BW] (-3885) Blea Wyke Sands (-98) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Section | Coastal section at Blea Wyke Point [NZ 991 015]. | ||
| Reference(s): | |||
| Young, T P. 1994. The Blea Wyke Sandstone Formation (Jurassic, Toarcian) of Rosedale, North Yorkshire, UK. Proceedings of the Yorkshire Geological Society, Vol. 50, 129-142. | |||
| Simms, M J, Chidlaw, N, Morton, N, and Page, K N. 2004. British Lower Jurassic Stratigraphy. Geological Conservation Review Series. No. 30. (Peterborough: Joint Nature Conservation Committee/Chapman and Hall.) | |||
| Rastall, R H and Hemingway, J E. 1943. The Yorkshire Dogger III. Upper Eskdale. Geological Magazine, Vol.80, 209-230. | |||
| Hemingway, J E. 1974. Jurassic. 161-233 in Rayner, D H and Hemingway, J E (eds), The geology and mineral resources of Yorkshire. (Leeds: Yorkshire Geological Society.) | |||
| Tate, R, and Blake, J F. 1876. The Yorkshire Lias. (London: J van Voorst.) | |||
| Knox, R W O B. 1984. Lithostratigraphy and depositional history of the late Toarcian sequence at Ravenscar, Yorkshire. Proceedings of the Yorkshire Geological Society, Vol. 45, 99-108. | |||
| 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. | |||
| Davies, A M. 1929. Jurassic. 350-382 in Handbook of the geology of Great Britain. Evans, J W, and Stubblefield, C J (editors). (London: Murby.) | |||
| Fox-Strangways, C and Barrow, G, 1915. The geology of the country between Whitby and Scarborough (2nd edition). Memoir of the Geological Survey of the United Kingdom. | |||
| Wright, T, 1860. On the subdivisions of the Inferior Oolite of the south of England, compared with the equivalent beds of that formation on the Yorkshire coast. Quarterly Journal of the Geological Society of London, 16, 1-48. | |||
| Cox, B M, Sumbler, M G, and Ivimey-Cook, H C. 1999. A Formational framework for the Lower Jurassic of England and Wales (Onshore Area). British Geological Survey Research Report No. RR/99/01. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E044 E035 | |||