The BGS Lexicon of Named Rock Units — Result Details

Lower Tealby Clay

Computer Code: LTC Preferred Map Code: LTC
Status Code: Index Level
Age range: Hauterivian Age (KH) — Hauterivian Age (KH)
Lithological Description: Lower Tealby Clay comprises blue-grey clay, glauconite-rich at some horizons and silty and oolitic in the lower part.
Definition of Lower Boundary: The erosional base separates blue-grey clay, glauconite-rich at some horizons and silty and oolitic in the lower part (Lower Tealby Clay) from clayey, oolitic ironstone (Claxby Ironstone Formation).
Definition of Upper Boundary: In much of Lincolnshire, sandy limestones and thin oolitic clays (Tealby Limestone Member) overlie blue-grey clay, silty and glauconite-rich at some horizons (Lower Tealby Clay). In southern-most Lincolnshire, in the Skegness Borehole, and beneath The Wash, the Tealby Limestone Member is missing and the Lower Tealby Clay cannot be separated satisfactorily from the Upper Tealby Clay. In northern Lincolnshire, between Audleby and Clixby, the arenaceous Carstone Formation rests on mudstones of the Lower Tealby Clay.
Thickness: Up to 13m proved, but an estimated 18m at North Willingham (Owen and Thurrell, 1968).
Geographical Limits: Southern and central Lincolnshire. Mudstones equivalent to the Lower Tealby Clay are present beneath The Wash, although the upper boundary of the member cannot be defined accurately due to the absence of the Tealby Limestone Member.
Parent Unit: Tealby Formation (TBF)
Previous Name(s): Lower Tealby Clay [Of The Tealby Series] (-1048)
Lower Tealby Clay Member (-4773)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Thoresway Borehole between 50.15 and 61.90m. 
Reference Section  Alford Borehole,"In the grounds of the pumping station" between [metricated] depths of 48.7 and 78.4m [Swinnerton, 1935]. Swinnerton, 1935. 
Reference(s):
Rawson, P F. 1971. Lower Cretaceous ammonites from north-east England: the Hauterivian genus Simbirskites. Bulletin of the British Museum (Natural History), Vol.20, 25-86. 
Wingfield, R T R, Evans, C D R, Deegan, S E and Floyd, R. 1978. Geological and geophysical survey of The Wash. Report of the Institute of Geological Sciences, 78/18, 32pp. 
Swinnerton, H H. 1935. The rocks below the Red Chalk of Lincolnshire and their cephlopod fauna. Quarterly Journal of the Geological Society, London, 91, 1-46. 
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:
E103 E089 E090 E091