The BGS Lexicon of Named Rock Units — Result Details
Esk Pike Sandstone Formation
Computer Code: | ESP | Preferred Map Code: | EsP |
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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 Formation [Obsolete Name and Code: Use ESP]
(-2790)
Esk Pike Hornstone (-895) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Reference Section | Calf Cove (Rydal Head) | ||
Reference Section | Black Crag (Rydal Head) | ||
Reference Section | Wythburn Fells | ||
Type Area | Summit of Esk Pike. | ||
Reference(s): | |||
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 | |||
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. | |||
McConnell, B J, 1993. The Lincomb Tarns and Esk Pike formations. British Geological Survey Technical Report, WA/93/44. | |||
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. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
E038 E029 E030 E039 |