The BGS Lexicon of Named Rock Units — Result Details
Well Hill Gravel Formation
| Computer Code: | WHGR | Preferred Map Code: | symb |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Early Pleistocene (QPE) — Early Pleistocene (QPE) | ||
| Lithological Description: | Gravel and sandy gravel; sub-angular, partly water-rolled flints up to 0.3m across, Lower Greensand cherts up to 10%. Tertiary pebbles, many decomposed brown flints; matrix of coarse sand, mostly quartzose, some flint; rare lenses of clay. | ||
| Definition of Lower Boundary: | Rests unconformably on bedrock: Lambeth Group (Woolwich and Reading Beds). | ||
| Definition of Upper Boundary: | Surface. | ||
| Thickness: | 2 to 4m | ||
| Geographical Limits: | Geographically isolated from other superficial deposits, at OD 155-167m, capping a hill at Well Hill, Kent. | ||
| Parent Unit: | Crag Group (CRAG) | ||
| Previous Name(s): | Well Hill Gravel [Obsolete Name and Code: Use WHGR]
(-4970)
Plateau Gravel (PLG) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Capping hill top alongside Well Hill Road north for 700m from main east-west road (Rock Hill) in Well Hill village. Dewey et al, 1924. | ||
| Reference(s): | |||
| Dewey, H, Bromehead, C E N, Chatwin, C P and Dines, H G. 1924. The geology of the country around Dartford. Memoir of the Geological Survey, Sheet 271 (England and Wales). | |||
| Ellison, R A, Woods, M A, Allen, D J, Forster, A, Pharaoh, T C and King, C. 2004. Geology of London. Memoir of the British Geological Survey, Sheets 256 (North London), 257 (Romford), 270 (South London), 271 (Dartford) (England and Wales). | |||
| 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. | |||
| Peake, D S. 1982. The ground upon which Croydon was built. A reappraisal of the Pleistocene history of the River Wandle and its basin. Proceedings of the Croydon Natural History and Scientific Society, Vol.17, 89-116. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E271 | |||