The BGS Lexicon of Named Rock Units — Result Details
Fox Cliff Siltstone Member
| Computer Code: | FXCL | Preferred Map Code: | FC |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Toarcian Age (JT) — Toarcian Age (JT) | ||
| Lithological Description: | Mudstone siltstone and silty mudstone, forming two fining upwards cycles, with scattered ferruginous ooids, thin siderite mudstone beds, layers of sideritic concretions and layers of phosphate nodules | ||
| Definition of Lower Boundary: | Conformable: sharp change up from dark grey mudstone (Peak Mudstone Member)into muddy siltstone, taken at base of semi-continuous sideritic mudstone bed (Bed 57 of Dean, 1954). | ||
| Definition of Upper Boundary: | Gradational; rapid upward transition from dark grey mudstone and siltstone to paler burrow-mottled silt and sand-rich sediment (Blea Wyke Sandstone Formation). | ||
| Thickness: | 11.1m at type section, thins to 9.9m 950 m to NW. | ||
| Geographical Limits: | Cleveland Basin: complete in Peak Trough. | ||
| Parent Unit: | Whitby Mudstone Formation (WHM) | ||
| Previous Name(s): | Striatulum Shales (upper part) and Grey Beds (lower part) [Obsolete Name and Code: Use FXCL]
(-2809)
Striatulum Clays [Obsolete Name and Code: Use FXCL] (-4055) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Section | Fully exposed at the foot of Fox Cliff, Blea Wyke, Ravenscar, North Yorkshire coast, where it is 11.1m thick, Beds 57 to 69 of Dean (1954). Knox, 1984; Simms et al. 2004, pp 271-281. | ||
| Reference(s): | |||
| 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. | |||
| 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.) | |||
| 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. | |||
| Hesselbo, S P and Jenkyns, H C A, 1995. A comparison of the Hettangian to Bajocian successions of Dorset and Yorkshire. 105-150 in Taylor, P D (Editor). Field geology of the British Jurassic (London Geological Society). | |||
| Dean, W T. 1954. Notes on part of the Upper Lias succession at Blea Wyke, Yorkshire. Proceedings of the Yorkshire Geological Society, Vol. 29, 161-179. | |||
| Rastall, R H and Hemingway, J E. 1941. The Yorkshire Dogger II. Lower Eskdale. Geological Magazine, Vol.78, 351-370. | |||
| Rastall, R H and Hemingway, J E. 1943. The Yorkshire Dogger III. Upper Eskdale. Geological Magazine, Vol.80, 209-230. | |||
| Rastall, R H and Hemingway, J E. 1949. The Yorkshire Dogger IV. Rosedale and Farndale. Geological Magazine, Vol.86, 201-225, 265-278. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| none recorded or not applicable | |||