| Computer Code: |
UTBC |
Preferred Map Code: |
UTC |
| Status Code: |
Index Level |
| Age range: |
Barremian Age (KB)
— Barremian Age (KB) |
| Lithological Description: |
Grey and buff clays, silty at some horizons and patchily glauconitic. Locally, oolitic horizons occur at the top. The unit becomes more ferruginous north of Donnington-on-Bain and can be confused with the Roach Formation. |
| Definition of Lower Boundary: |
The base is taken where sandy limestones and oolitic clays of the Tealby Limestone Member are overlain by grey and buff clays, silty at some horizons and sporadically glauconitic (Upper Tealby Clay). In southern Lincolnshire (Skegness Borehole) and The Wash, the Tealby Limestone Member is missing and the Upper Tealby Clay unit rests on the Lower Tealby Clay unit. The base of the unit is difficult to define accurately in these areas. |
| Definition of Upper Boundary: |
In southern Lincolnshire and The Wash the upper boundary is taken where grey and buff clays, silty at some horizons, patchily glauconitic and locally oolitic (Upper Tealby Clay unit) is overlain by a rhythmic sequence of interburrowed and interbedded clay, "chamosite" mud, chamosite ooliths, quartz sand and small pebbles of quartz and ironstone of the Roach Formation. In central to northern Lincolnshire the Upper Tealby Clay unit is overlain by ferruginous, sandy limestone and ferruginous, oolitic mudstones of the Roach Formation. |
| Thickness: |
Up to c.12m. |
| Geographical Limits: |
Southern and central Lincolnshire. Mudstones equivalent to the Upper Tealby Clay unit are present below The Wash, although the lower boundary of the unit cannot be accurately defined due to the absence of the Tealby Limestone Member. |
| Parent Unit: |
Tealby Formation (TBF)
|
| Previous Name(s): |
Upper Tealby Clay (of the Tealby Series) [Obsolete Name and Code: Use UTBC]
(-3747)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Alford Borehole TF47NW13, "In the grounds of the pumping station" between (metricated) depths of 40.7 and 61.02m (Swinnerton, 1935) Swinnerton, 1935. |
| Reference Section |
Thoresway Borehole TF19NE14 between 46.30 and 46.79m. |
| 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. |
| 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. |
| 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
|
