The BGS Lexicon of Named Rock Units — Result Details

Upper Lincolnshire Limestone Member
Computer Code: ULL Preferred Map Code: ULL
Status Code: Full
Age range: Bajocian Age (JB) — Bajocian Age (JB)
Lithological Description: Limestone, overwhelmingly dominated by high-energy ooidal and shell fragmental grainstones, but includes secondarily recrystallized and micritized lithologies.
Definition of Lower Boundary: Disconformable, commonly channelled contact between dominantly calcilutite, packstone and wackestone limestones of the Lower Lincolnshire Limestone Member, or (locally in the south) mudstone, sandstone and ironstone of the underlying Grantham Formation or Northampton Sand Formation, overlain by the ooidal and bioclastic grainstones of the Upper Lincolnshire Limestone.
Definition of Upper Boundary: Disconformable, commonly markedly eroded and karstified contact between ooidal and bioclastic grainstone of the Upper Lincolnshire Limestone and the non-calcareous non-marine sandstones, siltstones and mudstones of the overlying Rutland Formation. Near the northern limit only, disconformable contact between ooidal and bioclastic grainstone of the Upper Lincolnshire Limestone and ferruginous sandy calcareous sediments of the Hunstanton Formation (Cretaceous, Chalk Group).
Thickness: To c.15m
Geographical Limits: Essentially as for the Lincolnshire Limestone Formation, ie, Market Weighton area (where overstepped by Cretaceous, Chalk Group, Hunstanton Formation) to the Kettering-Peterborough area (where overstepped by the Rutland Formation). Extent in subcrop is uncertain, but probably as for the Lincolnshire Limestone Formation, ie, onshore areas of the northern part of the East Midlands Shelf.
Parent Unit: Lincolnshire Limestone Formation (LL)
Previous Name(s): Cave Oolite (*768)
Cave Oolite Member (-1467)
Hibaldstow Beds (-3107)
Upper Lincolnshire Limestone (*254)
Hibaldstow Limestones Member (-4707)
Cave Oolite [Obsolete Name And Code: See ULL] (CVO)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Premier Lime Company Quarry, Creeton, shows top of Ashton's Upper ('Clipsham') Member of Upper Lincolnshire Limestone. 
Reference Section  Ketton Quarry, 1.5km north of Ketton, Rutland, near Stamford, Lincolnshire. Fully exposed: 4.8 to 5.2m of beds. Cox and Sumbler, 2002, p.279. 
Reference Section  Blankney Quarry (additional section for Lower Division, ie 'Sleaford Member', of Upper Lincolnshire Limestone. 
Partial Type Section  Castle Lime Company Quarry, Castle Bytham. Top 4.78m represents all but the top of Ashton's Upper ('Clipsham') Member of Upper Lincolnshire Limestone. 
Type Section  Copper Hill Quarry, 1.5km southsouthwest of Ancaster, Lincolnshire. Designated as Type Section herein. Shows 10m of beds, all but the uppermost few metres of the member which have been removed by post Mesozoic erosion. Cox and Sumbler, 2002, p.298; Ashton, 1980; Berridge et al., 1999. 
Reference(s):
Cox, B M and Sumbler, M G. 2002. British Middle Jurassic Stratigraphy. Geological Conservation Review Series No.26. [Peterborough: Joint Nature Conservation Committee.] 
Ashton, M 1980. The stratigraphy of the Lincolnshire Limestone Formation (Bajocian) in Lincolnshire and Rutland (Leicestershire). Proceedings of the Geologists' Association, Vol.91, 203-224. 
Gaunt, G D, Fletcher, T P amd Wood, C J. 1992. Geology of the country around Kingston upon Hull and Brigg. Memoir of the British Geological Survey, sheets 80 and 89 (England and Wales). 
Hollingworth, S E and Taylor, J H, 1951. The Northampton Sand Ironstone, Stratigraphy, Structure and Reserves. Memoir of the Geological Survey of Great Britain. 
Kent, P E. 1966. A review of the correlation of the Lincolnshire Limestone (Inferior Oolite). Transactions of the Leicester Literary and Philosophical Society, Vol.60, 57-69. 
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 E158 E143 E157 E170 E171 E142
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