The BGS Lexicon of Named Rock Units — Result Details

Cleatham Limestone [Obsolete: use LLL]

Computer Code: CML Preferred Map Code: CML
Status Code: Full
Age range: Bajocian Age (JB) — Bajocian Age (JB)
Lithological Description: [Obsolete: use LLL] Limestone, predominantly calci-silty and calci-muddy with more or less abundant shell debris and peloids (wackestone and packstone) and fine quartz sand, ferruginous in some beds. Locally containing calcareous mudstone or siltstone interbeds, locally with ooidal packstone and grainstone at the top.
Definition of Lower Boundary: Quasi-conformable contact with predominantly calcareous mudstone and siltstone of the underlying part of the Raventhorpe Member where present, or more or less disconformable contact with sandstones and mudstones of the underlying Grantham Formation, overlain by limestone.
Definition of Upper Boundary: Conformable contact between limestone below and predominantly calcareous mudstone and siltstone of the overlying part of the Raventhorpe Member (Lincolnshire Limestone Formation).
Thickness: 0 to c. 2 m.
Geographical Limits: BGS 1: 50 000 sheets 80, 89, North Lincolnshire (south of the Humber).
Parent Unit: none recorded or not applicable
Previous Name(s): Santon Oolite Member (-795)
Cleatham Limestone Member [Obsolete Name and Code: Use CML] (-4557)
Basal Hydraulic Limestone Member [Obsolete Name and Code: Use RVB, CML] (-142)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Manton Stone Quarry, North Lincolnshire. Formerly fully exposed, 1.8m thick. Cox and Sumbler, 2002, 302-303; Ashton, 1975. 
Type Area  Cleatham, near Kirton in Lindsey, North Lincolnshire. 
Reference(s):
Ashton, M. 1975. A new section in the Lincolnshire Limestone of South Humberside and its significance. Proceedings of the Yorkshire Geological Society, Vol. 40, 419-429. 
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. 
Cox, B M, and Sumbler, M G. 2002. British Middle Jurassic Stratigraphy. Geological Conservation Review Series No.26. [Peterborough: Joint Nature Conservation Committee.] 
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. 
Gaunt, G D, Fletcher, T P and 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). 172pp. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E080 E089