The BGS Lexicon of Named Rock Units — Result Details
Boyn Hill Gravel Member
| Computer Code: | BHT | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Hoxnian Stage (QX) — Wolstonian Stage (QO) | ||
| Lithological Description: | Sand and gravel, with possible lenses of silt, clay or peat. [Generic description]. Poorly sorted, stratified gravel and locally tabular cross-bedded sand beds. Gravel assemblage is characterised by abundant angular flint (77-81%), sparse rounded flint (5-10%), sparse vein quartz (4-7%), sparse quartzite (1.5-5%), sparse Greensand chert (2.5-4%) and less than 1% of other types. | ||
| Definition of Lower Boundary: | Rests unconformably on bedrock geology or older superficial deposits. | ||
| Definition of Upper Boundary: | At surface. | ||
| Thickness: | 1-9m, average 5m | ||
| Geographical Limits: | Thames Valley and associated tributaries. | ||
| Parent Unit: | Maidenhead Formation (MNHD) | ||
| Previous Name(s): | Boyn Hill Terrace
(-57)
Boyn Hill Gravel Formation [Obsolete Name and Code: Use BHT] (-3851) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Section | Section near cemetery on Boyn Hill, Maidenhead. (Gibbard, 1985). | ||
| Reference(s): | |||
| Gibbard, P L, 1985. Pleistocene history of the Middle Thames Valley. (London: Cambridge University Press.) | |||
| Strange, P J. 1992. A new nomenclature for the River Terrace Deposits of North London. British Geological Survey Technical Report, WA/92/52. | |||
| Bromehead, C E N. 1912. On the diversions of the Bourne near Chertsey. Summary of Progress for 1911. Geological Survey of Great Britain. Appendix II. | |||
| 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. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E269 E254 E255 E256 E257 E268 E270 E271 | |||