The BGS Lexicon of Named Rock Units — Result Details

Overstrand Formation [Obsolete Name And Code: See BRLA]

Computer Code: OVSD Preferred Map Code: notEntered
Status Code: Index Level
Age range: Pleistocene Epoch (QP) — Pleistocene Epoch (QP)
Lithological Description: 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: Not Applicable (-)
Previous Name(s): North Sea Drift Formation (-1748)
Overstrand Glacigenic Formation (-1107)
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):
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. 
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.) 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable