The BGS Lexicon of Named Rock Units — Result Details

Stragglethorpe Grange Limestone Bed

Computer Code: SGGL Preferred Map Code: SG
Status Code: Full
Age range: Sinemurian Age (JS) — Sinemurian Age (JS)
Lithological Description: Grey, weathering pale brown, silty, finely sandy, shelly limestone in one or two closely-spaced 0.1 to 0.35m-thick beds. Upper part may include fine ferruginous peloids. Fauna includes forams, serpulids, gastropods, bivalves (including numerous pectiniids and Gryphaea), ammonites, belemnites, ostracods, fish debris and palynomorphs. Forms a weak feature.
Definition of Lower Boundary: Change up from grey shelly mudstone of the undifferentiated Foston Member; at 10.91m 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 10.72m depth in type section Fulbeck Airfield Borehole F/B5 (SK95SW/17).
Thickness: 0.1 to 1m; 0.19m 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 southwards into part of the mudstone-dominated Charmouth Mudstone Formation.
Parent Unit: Foston Member (FSTL)
Previous Name(s): Stragglethorpe Grange Limestone (-4877)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Fulbeck Airfield Borehole F/B5 (SK95SW/17). 
Reference(s):
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). 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E127 E142 E126