The BGS Lexicon of Named Rock Units — Result Details
Lodge Farm Limestones Bed
| Computer Code: | LGFL | Preferred Map Code: | LFL |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Sinemurian Age (JS) — Sinemurian Age (JS) | ||
| Lithological Description: | Group of several thin (six of 0.04 to 0.14 m thick in type section) probably impersistent limestone beds separated by mudstone beds (up to 0.3m thick). Limestones are hard, grey, brown-weathering, silty, bioclastic, fine- to medium-grained, with numerous bored Gryphaea and Pseudopecten. Fauna also includes gastropods, other bivalves, ostracods and echinoderms. Forms a weak feature. | ||
| Definition of Lower Boundary: | Change up from grey mudstone with phosphatic nodules of the undifferentiated Foston Member; at 30.90 m depth in type section Fulbeck Airfield Borehole F/B5 (SK95SW/17). | ||
| Definition of Upper Boundary: | Change up from grey mudstone of the undifferentiated Foston Member; at 29.51 m depth in type section Fulbeck Airfield Borehole F/B5 (SK95SW/17). | ||
| Thickness: | 1.0 to 3.5 m; 1.39 m in type section. | ||
| Geographical Limits: | East Midlands: north Leicestershire to Lincolnshire. Not recognized 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)
Lodge Farm Limestone [Obsolete Name and Code: Use LGFL] (-4160) |
||
| 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. | |||
| 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). | |||
| Sylvester-Bradley, P C and Ford, T D (editors), 1968. The Geology of the East Midlands. (Leicester: Leicester University Press.) | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E127 E142 E126 | |||