The BGS Lexicon of Named Rock Units — Result Details
Whelter Knotts Tuff Formation
| Computer Code: | WLT | Preferred Map Code: | Wlt |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Caradoc Series (O4) — Caradoc Series (O4) | ||
| Lithological Description: | A pale, yellowish grey, to grey-weathered, garnetiferous, massive silicic tuff and eutaxitic lapilli tuff, with subordinate foliated vitrophyric tuff, and bedded units of lithic-rich tuff and lapilli-tuff. Lithologically distinctive units have member status. | ||
| Definition of Lower Boundary: | Taken at the abrupt change to silicic pyroclastic rocks from andesite of the Birker Formation or the volcaniclastic rocks of the Scalehow Formation. | ||
| Definition of Upper Boundary: | Defined by the base of the Mardale Formation. | ||
| Thickness: | Up to 300 m thick. | ||
| Geographical Limits: | North-eastern Lake District, south and east of Ullswater to the Haweswater area. | ||
| Parent Unit: | Borrowdale Volcanic Group (BVG) | ||
| Previous Name(s): | Haweswater Ignimbrite Group
(-615)
Atkinson and Fordingdale Ignimbrite Group [Obsolete Name and Code: Use WLT] (-3137) Hugh's Laithes Pike Ignimbrite Group [Obsolete Name and Code: Use WLT] (-3138) Place Fell Group [Obsolete Name and Code: Use WLT] (-1279) |
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| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Kidsty Pike to Whelter Knotts, west of the Haweswater Reservoir. Beddoe-Stephens, B. 2000; Woodhall, D. 2000. | ||
| Reference(s): | |||
| Beddoe-Stephens, B. 2000. The Borrowdale Volcanic Group between Haweswater and eastern Ullswater. British Geological Survey Technical Report WG/00/04. | |||
| Woodhall, D G. 2000. The geology of the Haweswater and Martindale areas of the north-eastern Lake District. British Geological Survey Technical Report WA/00/55. | |||
| Millward, D. 2002. Geology of the area between Haweswater and Shap. British Geological Survey Research Report RR/02/02. | |||
| Moseley, F, 1960. The succession and structure of the Borrodale Volcanic rocks south-east of Ullswater. Quarterly Journal of the Geological Society of London, Vol.116, 55-84. | |||
| Nutt, M J C, 1970. The Borrowdale Volcanic Series and associated rocks around Haweswater, Westmorland. Unpublished PhD thesis, University of London (Queen Mary College). | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E030 E039 E029 | |||