The BGS Lexicon of Named Rock Units — Result Details
Tealby Limestone Member
| Computer Code: | TAL | Preferred Map Code: | TaL |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Barremian Age (KB) — Barremian Age (KB) | ||
| Lithological Description: | Comprises sandy limestone with ooid-rich mudstones. The limestones are thicker and more indurated in northern Lincolnshire, becoming thinner, softer and more argillaceous towards the south. | ||
| Definition of Lower Boundary: | The base is taken where blue-grey mudstones, glauconite-rich in some horizons and silty and ooid-rich in the lower part ("Lower Tealby Clay") are overlain by sandy limestones and ooid-rich mudstones (Tealby Limestone Member). | ||
| Definition of Upper Boundary: | In much of Lincolnshire, the base is taken where sandy limestones with ooid-rich mudstones (Tealby Limestone Member) are overlain by grey and buff mudstones, silt-rich in some horizons and locally glauconitic of the "Upper Tealby Clay". In the Brigg District, to the north of Normandy, sandy limestones (Tealby Limestone Member) are overlain by ferruginous limestone (Roach Formation). In the Audleby-Nettleton Top area, the Tealby Limestone Member is overlain by pebbly sandstone of the Carstone Formation. | ||
| Thickness: | Generally up to c.4m, but estimated to be 6m at North Willingham [Owen and Thurrell, 1968]. | ||
| Geographical Limits: | Confined to Lincolnshire. It was not seen in the Skegness Borehole nor beneath The Wash. According to Owen and Thurrell (1968) it is present between Belchford and Cawkwell and in the south and is 3.4m thick at Thorseway. It thins and disappears to the north of Audleby. | ||
| Parent Unit: | Tealby Formation (TBF) | ||
| Previous Name(s): | Tealby Limestone [Obsolete Name and Code: Use TAL]
(-3067)
Greystone [Obsolete Name and Code: Use TAL, TBF] (-1217) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Reference Section | Thoresway Borehole TF19NE14 [1646 9632] 46.3 to 46.79m depth. | ||
| Reference Section | Alford Borehole, TF47NW13 [44630 75583] "In the grounds of the pumping station" 48.7 to 64.94 mdepth (metricated). Swinnerton, 1935. | ||
| Reference(s): | |||
| 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. | |||
| 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. | |||
| Dikes, W H and Lee, J W. 1837. Outlines of the Geology of Nettleton Hill, Lincolnshire. The Magazine of Natural History, I [No.11], 562-566. | |||
| Judd, J W. 1867. On the strata which form the base of the Lincolnshire Wolds. Quarterly Journal of the Geological Society, London, 23, 227-251. | |||
| Owen, E F and Thurrell, R G. 1968. British rhynchonelloid brachiopods. Bulletin of the British Museum [Natural History], Geology, Vol.16, 99-123. | |||
| Rawson, P F. 1992. Cretaceous, 355-388 in Duff, P McL D and Smith, A J (editors), Geology of England and Wales. (London: Geological Society.) | |||
| 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. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E103 E089 E090 E091 | |||