The BGS Lexicon of Named Rock Units — Result Details

Corton Woods Sand And Gravel Member

Computer Code: CWSG Preferred Map Code: notEntered
Status Code: Full
Age range: Pleistocene Epoch (QP) — Pleistocene Epoch (QP)
Lithological Description: The Corton Woods Sand and Gravel Member is composed of medium gravels and fine- to coarse-grained sands. The gravels comprise mainly flint, with subordinate quartz and quartzite. The gravels tend to be strongly imbricated in coastal sections. Inland there are few exposures and they comprise pebbly, well-rounded, medium-grained sands.
Definition of Lower Boundary: The Corton Woods Sand and Gravel Member rests unconformably on the pebbly silt and clay of the Pleasure Gardens Till Member (of the Lowestoft Formation), but also locally in cliff sections at [TM 5464 9660] a layer of black clayey silt up to 0.4m thick intervenes. The Member may also overlie the sands of the Corton Formation; where this occurs, the base is marked by the incoming of gravel.
Definition of Upper Boundary: The upper surface of the Corton Woods Sand and Gravel Member is typically exposed at surface, but very locally is overlain by Head in several small valleys.
Thickness: Probably up to about 7m, but only 4.3m at type section.
Geographical Limits: Restricted to the area of northern Lowestoft, East Anglia.
Parent Unit: Briton's Lane Formation (BRLA)
Previous Name(s): Gravel, Sand And Loam (-2731)
Corton Woods Sands And Gravels (-3968)
Alternative Name(s): Corton Woods Sand And Gravels
Stratotypes:
Type Section  Cliff at Corton Woods. Arthurton et al., 1994. 
Reference(s):
Blake, J H. 1890. The geology of the country near Yarmouth and Lowestoft. Memoir of the Geological Survey (England and Wales). 
Bridge, D M and Hopson, P M. 1985. Fine gravel, heavy mineral and grain size analysis of mid-Pleistocene glacial deposits in the lower Waveney valley, East Anglia. Modern Geology, Vol.9, 129-144. 
Moorlock, B S, Hamblin, R J O, Morigi, A N, Booth, S J and Jeffery, D H. 2000. The geology of the country around Lowestoft and Saxmundham. Memoir of the British Geological Survey, sheets 176 and 191 (England and Wales). 
Pointon, K W. 1978. The Pleistocene succession at Corton, Suffolk. Bulletin of the Geological Society of Norfolk, Vol.30, 55-76. 
Bridge, D M. 1993. Geological notes and local details for 1:10 000 sheets TM49NE, TM59NW and part of TM59NE (Somerleyton and Corton). British Geological Survey Technical Report, WA/93/92. 
Arthurton, R S, Booth, S J, Morigi, A N, Abbott, M A W and Wood, C J. 1994. Geology of the country around Great Yarmouth, Sheet Memoir 162, British Geological Survey. [London: HMSO.] 138pp 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E162 E176