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 0.4 m 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 7 m, but only 4.3 m 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 [Obsolete Name and Code: Use CWSG]
(-2731)
Corton Woods Sands and Gravels [Obsolete Name and Code: Use CWSG] (-3968) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Section | Cliff at Corton Woods. Arthurton et al., 1994. | ||
| Reference(s): | |||
| 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. | |||
| 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. | |||
| 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. 2000a. 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. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E162 E176 | |||