The BGS Lexicon of Named Rock Units — Result Details
Kenn Formation
| Computer Code: | KNN | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Early Pleistocene (QPE) — Mid Pleistocene (QPM) | ||
| Lithological Description: | The formation includes glacigenic deposits interpreted as till, outwash and glacio-marine. Coarse outwash sands and gravels, poorly to well sorted, are interbedded with reddish purple till. Both contain clasts of Carboniferous limestone, Upper Greensand chert, Jurassic limestone, and Cretaceous flint, up to cobble and boulder size, with small quantities of Devonian red quartzite, sandstones and conglomerates. Pennant sandstone and yellow Triassic sandrock. | ||
| Definition of Lower Boundary: | Rests upon Triassic bedrock. | ||
| Definition of Upper Boundary: | Mostly at surface. At Kenn, overlain by Cromerian (MIS 15) deposits and by Holocene silts and clays. | ||
| Thickness: | To c.14m | ||
| Geographical Limits: | Restricted to Avon and north Somerset; occurrences at Kenn, Court Hill, Nightingale Valley, Failland Ridge, Bathampton Down and Bleadon Hill. | ||
| Parent Unit: | Albion Glacigenic Group (ALBI) | ||
| Previous Name(s): | Sand and gravel of unknown origin [Obsolete Name and Code: Use SGAO]
(SGUO)
Burthel Beds [Obsolete Name and Code: Use KNN] (-2271) Sand and gravel of unknown origin [Obsolete Name and Code: Use SGAO] (SGUO) Kenn Gravels [Obsolete Name and Code: Use KNN] (-1628) |
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| Alternative Name(s): | Kenn Court Member Nightingale Member Kennpier Member Bathampton Down Member Bleadon Member |
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| Stratotypes: | |||
| Type Area | Avon and north Somerset. Campbell et al, 1999. | ||
| Reference(s): | |||
| Campbell, S, Hunt, C O, Scourse, J D, Keen, D H and Croot, D G. 1999. Southwest England. 66-78 in Bowen, D Q (Editor), A revised correlation of Quaternary deposits in the British Isles. Geological Society Special Report No.23. [London: Geological Society.] | |||
| Whittaker A and Green G W. 1983. Geology of the country around Weston-super-Mare. Memoir of the Geological Survey, England and Wales, Sheet 279 with parts of sheets 263 and 295. | |||
| Andrews, J T, Gilbertson, D, and Hawkins, A B. 1984. The Pleistocene succession of the Severn Estuary: a revised model based upon amino acid racemization studies. Journal of the Geological Society of London, Vol. 141, 967-974. | |||
| Hawkins, A B, and Kellaway, G A. 1971. Field Meeting at Bristol and Bath with special reference to new evidence of glaciation. Proceedings of the Geologists' Association, Vol.82, 267-291. | |||
| Kellaway, G A and Welch, F B A. 1993. Geology of the Bristol district. Memoir of the British Geological Survey Special Sheet [England and Wales]. | |||
| Gilbertson, D D and Hawkins, A B. 1978. The Pleistocene succession at Kenn, Somerset. Bulletin of the Geological Survey of Great Britain, No.66, p.41. | |||
| Colbourne, G, Gilbertson, D D and Hawkins, A B. 1974. Temporary drift exposures on the Failland Ridge. Proceedings of the Bristol Naturalists' Society, Vol.33, 91-97. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E264 E279 | |||