The BGS Lexicon of Named Rock Units — Result Details
Millom Park Formation [Obsolete: use WB]
| Computer Code: | MPA | Preferred Map Code: | MPa |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Abereiddian Stage (O2) — Caradoc Series (O4) | ||
| Lithological Description: | [Obsolete: use WB] Dacitic lapilli-tuff and tuff. Mostly massive with some interbeds of parallel bedded tuff. Intruded by basalt, basaltic andesite and andesite and locally contains intercalated andesite lava. | ||
| Definition of Lower Boundary: | Unconformity. Overlies less widely distributed older Formations (Po House and Whinney Bank) in the Borrowdale Volcanic Group and locally rests directly on the Skiddaw Group. | ||
| Definition of Upper Boundary: | Parallel bedded tuffs of the Duddon Hall Formation. | ||
| Thickness: | 1800-2600m | ||
| Geographical Limits: | Beckfoot (SD 194 899) to Kirksanton (SD 140 807), south-east of Whicham Valley, Cumbria. | ||
| Parent Unit: | none recorded or not applicable | ||
| Previous Name(s): | A variety of local names [Obsolete Name and Code: Use MPA]
(-1707)
Middle Tuffs [Obsolete Name and Code: Use MPA] (-405) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Millom Park, north of Millom, Cumbria. | ||
| Reference Section | Between Knott Hill and Beckfoot. | ||
| Reference(s): | |||
| British Geological Survey. 1994b. Millom Park, SD18SE, Solid and Drift, 1:10 000. (Keyworth, Nottingham: British Geological Survey.) | |||
| Mathieson, N A, 1986 Geology, structure and geochemistry of the Ordovician volcanic succession in south west Cumbria. Unpublished Ph.D. thesis, University of Sheffield. | |||
| Johnson, E W, Soper, N J, Burgess, I C, Ball, D F, Beddoe-Stephens, B, Carruthers, R M, Fortey, N J, Hirons, S, Merritt, J W, Millward, D, Roberts, B, Walker, A B and Young, B. 2001. Geology of the country around Ulverston. Memoir of the British Geological Survey, England and Wales, Sheet 48. | |||
| British Geological Survey. 1994a. Duddon Bridge and Hallthwaites, SD18NE, Solid and Drift 1:10 000. (Keyworth, Nottingham: British Geological Survey.) | |||
| Green, J F N, 1913. The older Palaeozoic succession of the Dudden Estuary. London, 23pp. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| none recorded or not applicable | |||