The BGS Lexicon of Named Rock Units — Result Details
Beaconsfield Gravel Member
| Computer Code: | BDGR | Preferred Map Code: | symb |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Early Pleistocene (QPE) — Mid Pleistocene (QPM) | ||
| Lithological Description: | Comprises 1 - 7 m of variably sandy and clayey gravel. | ||
| Definition of Lower Boundary: | Erosional base on Tertiary-Cretaceous bedrock. | ||
| Definition of Upper Boundary: | Erosional remnants of terrace surface. | ||
| Thickness: | 1-7 m. | ||
| Geographical Limits: | Thames Valley. | ||
| Parent Unit: | Sudbury Formation (SBRY) | ||
| Previous Name(s): | Higher gravel train [Obsolete Name and Code: Use BDGR]
(-3829)
Plateau Gravel (PLG) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Section | Terrace and borehole data at Beaconsfield Station, where 6 m of gravel overlie the Chalk (Gibbard, 1985). | ||
| Reference(s): | |||
| Whiteman, C A and Rose, J. 1992. Thames river sediments of the British Early and Middle Pleistocene. Quarterly Science Reviews, Vol.11, 363-375. | |||
| Whiteman, C A. 1992. The palaeogeography and correlation of pre-Anglian-Glaciation terraces of the River Thames in Essex and the London Basin. Proceedings of the Geologists' Association, Vol.103, 37-56. | |||
| McMillan, A A, Hamblin, R J O, and Merritt, J W. 2011. A lithostratigraphical framework for onshore Quaternary and Neogene (Tertiary) superficial deposits of Great Britain and the Isle of Man. British Geological Survey Research Report, RR/10/03. 343pp. | |||
| Gibbard, P L, 1985. Pleistocene history of the Middle Thames Valley. (London: Cambridge University Press.) | |||
| Wooldridge, S H, 1938. The Glaciation of the London Basin and evolution of the Lower Thames Drainage System. Quarterly Journal of the Geological Society, Vol.94, 627-67. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E268 | |||