The BGS Lexicon of Named Rock Units — Result Details
Foston Member
Computer Code: | FSTL | Preferred Map Code: | Fst |
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Status Code: | Full | ||
Age range: | Sinemurian Age (JS) — Sinemurian Age (JS) | ||
Lithological Description: | Grey mudstones containing laterally persistent beds of individually distinctive limestones, totalling c.10% of sequence thickness. | ||
Definition of Lower Boundary: | Base of distinctively iron-rich limestone beds (Stubton Limestones), below which mudstones (Beckingham Member) contain only rare and thin limestone beds; at 34.65m depth in type section. | ||
Definition of Upper Boundary: | In type area, at erosive base of a ferruginous bed of oolitic wackestone (Glebe Farm Bed) at the base of the Charmouth Mudstone Formation; (at 4.58m depth in type section). | ||
Thickness: | 30.07m in type section. | ||
Geographical Limits: | East Midlands Shelf; southwards the characteristic limestones pass into mudstones; northwards limestones develop in underlying Beckingham Member. | ||
Parent Unit: | Scunthorpe Mudstone Formation (SMD) | ||
Previous Name(s): | Foston Limestones [Obsolete Name and Code: Use FSTL]
(-4052)
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Alternative Name(s): | Ferruginous Limestone Series [Obsolete: use SMD] Ironstone Series [Obsolete: use CDI, NS] Ferruginous Limestone |
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Stratotypes: | |||
Partial Type Section | Fulbeck Airfield Borehole F/B1 (SK85SE/25), depths 0 to 17.9m. | ||
Type Section | Fulbeck Airfield Borehole F/B5 (SK95SW/17), depths 4.58 to 34.65m. | ||
Reference(s): | |||
Brandon, A, Sumbler, M G and Ivimey-Cook, H C, 1990. A revised lithostratigraphy for the Lower and Middle Lias (Lower Jurassic) east of Nottingham, England. Proceedings of the Yorkshire Geological Society, Vol.48, 121-141. | |||
Sumbler, M G, 1987. Geological Notes and Local Details for 1:10,000 Sheet SK95SW (Brant Broughton). British Geological Survey Technical Report. | |||
Sumbler, M G, 1987. Geological Notes and Local Details for 1:10,000 Sheet SK85SE (Beckingham). British Geological Survey Technical Report. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
E127 E142 |