The BGS Lexicon of Named Rock Units — Result Details
Cwm Yr Aethnen Mudstones Formation
Computer Code: | CYA | Preferred Map Code: | Cya |
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Status Code: | Pending Upgrade | ||
Age range: | Llandovery Epoch (SL) — Llandovery Epoch (SL) | ||
Lithological Description: | Dark blue mudstones and laminated siltstones. | ||
Definition of Lower Boundary: | Not defined. | ||
Definition of Upper Boundary: | Not defined. | ||
Thickness: | 0 to 150m | ||
Geographical Limits: | Not defined. | ||
Parent Unit: | Not Available (!) | ||
Previous Name(s): | Cwm Yr Aethnen Mudstones [Obsolete Name and Code: Use CYA]
(-2733)
Cwm Yr Aethnen Shales [Obsolete Name and Code: Use CYA] (-2734) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
none recorded or not applicable | |||
Reference(s): | |||
Bassett, D A, Whittington, H B, and Williams, A. 1966. The stratigraphy of the Bala district, Merionethshire. Quarterly Journal of the Geological Society of London, Vol. 122, 219-271. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
E120 E136 |