The BGS Lexicon of Named Rock Units — Result Details

Shenley Limestone Member

Computer Code: SHEN Preferred Map Code: notEntered
Status Code: Full
Age range: Albian Age (KA) — Albian Age (KA)
Lithological Description: Lenticular beds of a pale brown, phosphatic limestone with scattered polished goethite ooliths (Owen 1972; Smart, 1997). It may be slightly limonitic and glauconitic. Brachiopods common.
Definition of Lower Boundary: The base is taken where a thin, gritty ironstone ("carstone") overlying silty beds at the top of the Woburn Sands Formation passes up into a sandy mudstone associated with lenticular beds of a pale brown phosphatic limestone with scattered polished goethite ooliths (Shenley Limestone Member) (Owen, 1972; Smart, 1997).
Definition of Upper Boundary: The top is taken where phosphatic limestone of the Shenley Limestone Member is overlain by a 1.2m-thick fissile, red mudstone informally called "Red Clay" or the "Cirripede Bed" of the Gault Formation.
Thickness: Up to c. 0.1m.
Geographical Limits: Restricted to the area around Leighton Buzzard. Leighton Buzzard Sheet 1:50k sheet number 220.
Parent Unit: Munday's Hill Phosphatic Sandstone Formation (MHPS)
Previous Name(s): Shenley Limestone Bed (-521)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Bryants Lane Quarry, north of Leighton Buzzard. Shephard Thorne et al., 1994. 
Type Area  Shenley Hill [SP 93 27] near Leighton Buzzard. 
Reference Section  Munday's Hill, 420m northwest of Mile Tree Farm, Heath and Reach. Owen, 1972. 
Reference(s):
Eyers, J. 1991. The influence of tectonics on early Cretaceous sedimentation in Bedfordshire, England. Journal of the Geological Society of London, Vol. 149, 405-414. 
Shepard-Thorn, E R, Moorlock, B S P, Cox, B M, Allsop, J M and Wood, C J. 1994. Geology of the country around Leighton Buzzard. Memoir of the British Geological Survey, Sheet 220 (England and Wales). 
Lamplugh, G W and Walker, J F. 1903. On a fossiliferous band at the top of the Lower Greensand near Leighton Buzzard (Bedfordshire). Quarterly Journal of the Geological Society, London, Vol.59, 234-265. 
Lamplugh, G W. 1922. On the junction of the Gault and Lower Greensand near Leighton Buzzard, Bedfordshire. Quarterly Journal of the Geological Society of London, Vol.78, 1-81. 
Owen, H G. 1972. The Gault and its junction with the Woburn Sands in the Leighton Buzzard area, Bedfordshire and Buckinghamshire. Proceedings of the Geologists' Association, Vol.83, 287-312. 
Eyers, J. 1995. Correlation of the Lower Greensand Group (Woburn Sands and Carstone) of the Bedfordshire Province, England. Cretaceous Research, Vol.16, 385-413. 
Smart, P J. 1997. The basal Gault and Gault-Woburn Sands junction beds in Chamberlain's Barn Quarry, Leighton Buzzard, Bedfordshire, England. Proceedings of the Geologists' Association, Vol.108, 287-292. 
Casey, R, 1961. The stratigraphical palaeontology of the Lower Greensand. Palaeontology, Vol.3, 487-621. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable