| 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 0.35 m-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 10.91 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 10.72 m depth in type section Fulbeck Airfield Borehole F/B5 (SK95SW/17). |
| Thickness: |
0.1 to 1 m; 0.19 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 southwards into part of the mudstone-dominated Charmouth Mudstone Formation. |
| Parent Unit: |
Foston Member (FSTL)
|
| Previous Name(s): |
Stragglethorpe Grange Limestone [Obsolete Name and Code: Use SGGL]
(-4877)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Fulbeck Airfield Borehole F/B5 (SK95SW/17). |
| Reference(s): |
| 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. |
| 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). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E127
E142
E126
|
