| Computer Code: |
LTGL |
Preferred Map Code: |
Lt |
| Status Code: |
Full |
| Age range: |
Sinemurian Age (JS)
— Sinemurian Age (JS) |
| Lithological Description: |
Group of one to three, typically two, limestone beds, separated by mudstone. Lower limestone is hard grey, very shelly, including ammonites, bioclastic and about 0.25 m thick. Upper limestone is less shelly, fine, very sandy, ferruginous limestone, with pectiniids. Fauna (mainly from the lower limestone bed) also includes forams, gastropods, brachiopods, belemnites (lowest recorded in area), ostracods, echinoderms, and Chondrites burrows. Forms a strong feature. |
| Definition of Lower Boundary: |
Change up from grey mudstone with phosphate nodules of undifferentiated Foston member; at c 3.3 m depth in type section Fulbeck Airfield Borehole F/B1 (SK85SE/25). |
| Definition of Upper Boundary: |
Change up from grey mudstone of undifferentiated Foston member; at c.1.8 m depth in type section Fulbeck Airfield Borehole F/B1 (SK85SE/25). |
| Thickness: |
0.2 to 1.5 m; c.1.5 m in type section. |
| Geographical Limits: |
East Midlands: north Leicestershire to Linclonshire. 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): |
Littlegate Limestone [Obsolete Name and Code: Use LTGL]
(-1049)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Fulbeck Airfield Borehole F/B1 (SK85SE/25). |
| 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). |
| 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). |
| 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
|
