The BGS Lexicon of Named Rock Units — Result Details
Tealby Formation
| Computer Code: | TBF | Preferred Map Code: | TbF |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Hauterivian Age (KH) — Barremian Age (KB) | ||
| Lithological Description: | Brown and grey clays, ooidal and glauconitic in part, with a sandy limestone in the middle part of the formation. It can be divided into three units. Lower unit. Blue-grey clay, glauconite-rich at some horizons and silty ooidal in the lower part [Lower Tealby Clay Member] Middle unit. Comprises sandy limestones and oolitic clays [Tealby Limestone Member]. The limestones are thicker and more indurated in northern Lincolnshire, becoming thinner, softer and more argillaceous towards the south. Upper unit. Grey and buff clays, silty at some horizons and locally glauconitic [Upper Tealby Clay Member]. Locally, ooidal horizons occur at the top. | ||
| Definition of Lower Boundary: | The base is an erosion surface where there is a downsection change from blue-grey clay, glauconite-rich at some horizons and silty and ooidal in the lower part [Lower Tealby Clay Member] to clayey, ooidal ironstone [Claxby Ironstone Formation]. | ||
| Definition of Upper Boundary: | In southern Lincolnshire and The Wash a rhythmic succession of interburrowed and interbedded clay, "chamosite" mud, chamosite ooids, quartz sand and small pebbles of quartz and ironstone [Roach Formation] rest on grey and buff clays, silty at some horizons, locally glauconitic or ooidal [Upper Tealby Clay Member]. In central to northern Lincolnshire ferruginous, sandy limestone and ferruginous, oolitic mudstones [Roach Formation] rest on grey and buff clays, silty at some horizons, locally glauconitic or ooidal [Upper Tealby Clay Member] In northern Lincolnshire, between Nettleton Top and Audleby, sandstones of the overstepping Carstone Formation rest on the limestones of the Tealby Limestone Member, and between Audleby and Clixby the arenaceous Carstone Formation rests on mudstones of the Lower Tealby Clay. | ||
| Thickness: | Up to c. 31m. | ||
| Geographical Limits: | The Tealby Formation is present in Boreholes in The Wash, the southern-most sections being in BGS boreholes 72/77 and 72/78 [Wingfield et al., 1978]. Further south, it apparently passes laterally into the Roach and Dersingham Formations [e.g. in Hunstanton Borehole]. The Tealby Formation occurs beneath the Lincolnshire Wolds disappearing north of the Audleby area in northern Lincolnshire. Its presence around Elsham, northern Lincolnshire, recorded in early publications, is due to the erroneous correlation of Neocomian deposits with the kimmeridgian Elsham Sandstone and Kimmeridge Clay Formation. | ||
| Parent Unit: | Not Applicable (-) | ||
| Previous Name(s): | Tealby Beds [Obsolete Name And Code: Use TBF]
(TYB)
Greystone [Obsolete Name and Code: Use TAL, TBF] (-1217) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| 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 Section | Thoresway Borehole between depths 46.30 and 61.9m | ||
| Reference(s): | |||
| 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. | |||
| Waters, C N, Smith, K, Hopson, P M, Wilson, D, Bridge, D M, Carney, J N, Cooper, A H, Crofts, R G, Ellison, R A, Mathers, S J, Moorlock, B S P, Scrivener, R C, McMillan, A A, Ambrose, K, Barclay, W J, and Barron, A J M. 2007. Stratigraphical Chart of the United Kingdom: Southern Britain. British Geological Survey, 1 poster. | |||
| 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. | |||
| 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. | |||
| 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. | |||
| 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. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E103 E081 E090 E091 E115 | |||