The BGS Lexicon of Named Rock Units — Result Details
Stubton Limestones Bed
| Computer Code: | STBL | Preferred Map Code: | StL |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Sinemurian Age (JS) — Sinemurian Age (JS) | ||
| Lithological Description: | Group of two to four limestone beds separated by mudstone. Uppermost bed is typically brown and grey mottled, highly bioturbated, shelly, bioclastic, ferru-ooidal, packstone with numerous bored Gryphaea, weathering to orange brown, and 0.61 m thick in the type section. Below are one to three thinner, non-ooidal argillaceous limestone beds. Rich fauna including forams, serpulids, corals, brachiopods, gastropods and ammonites. Forms a strong scarp feature with a dip slope. | ||
| Definition of Lower Boundary: | Change up from bluish grey, shaly mudstone with numerous phosphatic nodules of uppermost 1m of the undifferentiated Beckingham Member; at 34.65 m depth in type section Fulbeck Airfield Borehole F/B5 (SK95SW/17). | ||
| Definition of Upper Boundary: | Change up into grey, mudstone of the undifferentiated Foston Member; at 33.51 m depth in type section Fulbeck Airfield Borehole F/B5 (SK95SW/17). | ||
| Thickness: | 1.0 to 2.4 m; 1.14 m in type section. | ||
| Geographical Limits: | East Midlands: north Leicestershire to Lincolnshire. Not recognised in the Scunthorpe Mudstone Formation of north Lincolnshire, or south Leicestershire, where it passes south either into part of the more argillaceous Rugby Limestone Member of the Blue Lias Formation or into part of the mudstone-dominated Charmouth Mudstone Formation. | ||
| Parent Unit: | Foston Member (FSTL) | ||
| Previous Name(s): | Plungar Ironstone [Obsolete Name and Code: Use LGFL, STBL]
(-361)
Stubton Limestone [Obsolete Name and Code: Use STBL] (-2452) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Section | Fulbeck Airfield Borehole F/B5 (SK95SW/17). | ||
| 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. | |||
| Sylvester-Bradley, P C and Ford, T D (editors), 1968. The Geology of the East Midlands. (Leicester: Leicester University Press.) | |||
| 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). | |||
| Carney, J N, Ambrose, K and Brandon A. 2002. Geology of the Melton Mowbray district - a brief explanation of the geological map. British Geological Survey Sheet Explanation, Sheet 142 (England and Wales). | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E127 E142 E126 | |||