The BGS Lexicon of Named Rock Units — Result Details
Esk Pike Sandstone Formation
| Computer Code: | ESP | Preferred Map Code: | EsP |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Caradoc Series (O4) — Caradoc Series (O4) | ||
| Lithological Description: | In type area, laminated volcaniclastic mudstone and siltstone ("hornstone") with interbeds of volcaniclastic sandstone and eutaxitic lapilli tuff. Becoming massive bedded volcaniclastic sandstone with intercalations of volcaniclastic breccia, tuff and lapilli-tuff to the east. | ||
| Definition of Lower Boundary: | Base of bedded volcaniclastic sedimentary rock sequence, unconformably overlying Lincomb Tarns Tuff Formation (dacitic lapilli-tuff). | ||
| Definition of Upper Boundary: | Not seen in type area, but around Hellvellyn it is defined by the base of various overlying formations, including the Middle Dodd Dacite, Deepdale and Helvellyn formations. | ||
| Thickness: | 170m in Central Fells, reaching 200m in the Helvellyn area | ||
| Geographical Limits: | Esk Pike - Great End - Alton Crags; Easdale, Helvellyn, Scandale, Grisedale and Hartsop Dodd, Cumbria. | ||
| Parent Unit: | Borrowdale Volcanic Group (BVG) | ||
| Previous Name(s): | Esk Pike Hornstone
(-895)
Esk Pike Formation [Obsolete Name and Code: Use ESP] (-2790) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Summit of Esk Pike. | ||
| Reference Section | Calf Cove (Rydal Head) | ||
| Reference Section | Black Crag (Rydal Head) | ||
| Reference Section | Wythburn Fells | ||
| Reference(s): | |||
| McConnell, B J, 1993. The Lincomb Tarns and Esk Pike formations. British Geological Survey Technical Report, WA/93/44. | |||
| Oliver, R L, 1961. The Borrowdale Volcanic and associated rocks of the Scafell area, English Lake District. Quarterly Journal of the Geological Society of London, Vol 117, p. 377-417 | |||
| Woodhall, D G, 1998. The geology of the Wythburn, Thirlmere and Fairfield areas of the north-east Lake District. British Geological Survey Technical Report WA/98/07. | |||
| Hartley, J J. 1932. The Volcanic and other Igneous rocks of Great and Little Langdale, Westmorland: with notes on the Tectonics of the district. Proceedings of the Geologists' Association, Vol.43, p.32-69. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E038 E029 E030 E039 | |||