The BGS Lexicon of Named Rock Units — Result Details
Cystoid Limestone Member
Computer Code: | CYO | Preferred Map Code: | notEntered |
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Status Code: | Full | ||
Age range: | Ashgill Series (OA) — Ashgill Series (OA) | ||
Lithological Description: | Pale grey argillaceous limestone. | ||
Definition of Lower Boundary: | Base of limestone above grey mudstones. | ||
Definition of Upper Boundary: | Top of limestone, transitional to grey mudstone. | ||
Thickness: | 1.5 to 3m | ||
Geographical Limits: | Howgill Fells - may correlate with the Troutbeck Member of the Lake District. | ||
Parent Unit: | Ashgill Formation (AHL) | ||
Previous Name(s): | Staurocephalus Limestone [Obsolete Name and Code: Use SWL, CYO]
(-3345)
Cystoid Limestone [Obsolete Name and Code: Use CYO] (-181) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Section | Odd Gill, 300m east of its confluence with Wandale Beck. | ||
Reference(s): | |||
Marr, J E, 1892. The Coniston Limestone Series. Geological Magazine, Vol.(3) 9, 97-110. | |||
Kneller, B C, Scott R W, Soper N J, Johnson E W and Allen P M, 1994. Lithostratigraphy of the Windermere Supergroup, Northern England. Geological Journal, Vol. 29, 219-240. | |||
Ingham, J K, 1966. The Ordovician rocks in the Cautley and Dent districts of Westmorland and Yorkshire. Proceedings of the Yorkshire Geological Society, Vol.35, 455-505. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
none recorded or not applicable |