The BGS Lexicon of Named Rock Units — Result Details
Overstrand Formation [Obsolete: use BRLA]
Computer Code: | OVSD | Preferred Map Code: | notEntered |
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Status Code: | Full | ||
Age range: | Pleistocene Epoch (QP) — Pleistocene Epoch (QP) | ||
Lithological Description: | [Obsolete: use BRLA] Glaciogenic complex of tills, gravels and sands; tills are either very sandy or very chalky (mostly superficial); gravels are dominantly rounded flint with some Scandinavian quartz porphyry and dolerite. | ||
Definition of Lower Boundary: | Unconformity, rests upon Lowestoft Formation (chalky clay, diamicton), Wroxham Crag Formation (marine sands, clays and gravels), Upper Chalk and Corton Formation (sands, sandy diamictron). | ||
Definition of Upper Boundary: | Unconformity, overlain by head, alluvium and recent beach deposits. | ||
Thickness: | c.40m | ||
Geographical Limits: | Northern and Eastern Norfolk. | ||
Parent Unit: | none recorded or not applicable | ||
Previous Name(s): | Overstrand Glacigenic Formation [Obsolete Name and Code: Use OVSD]
(-1107)
North Sea Drift Formation [Obsolete Name and Code: Use OVSD] (-1748) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Reference Section | Gravel pit off Briton's Lane, Beeston Regis. | ||
Type Area | North Norfolk coast from Weybourne to Trimingham. Lunkka, 1994; Hart and Boulton, 1991. | ||
Reference(s): | |||
Hart, J K and Boulton, G S. 1991. The glacial drifts of Norfolk. 233-243 in Ehlers, J, Gibbard, P L and Rose, J (editors), Glacial Deposits of Britain and Ireland. (Rotterdam, Balkema.) | |||
Bowen, D Q. 1999. A revised correlation of Quaternary deposits in the British Isles. Geological Society Special Report, No. 23. | |||
Lunkka, J P. 1994. Sedimentation and lithostratigraphy of the North Sea Drift and Lowestoft Till Formations in the coastal cliffs of northeast Norfolk, England. Journal of Quaternary Science, Vol. 9, 203-233. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
none recorded or not applicable |