The BGS Lexicon of Named Rock Units — Result Details
Rhiwlas Limestone Member
Computer Code: | RWL | Preferred Map Code: | notEntered |
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Status Code: | Pending Upgrade | ||
Age range: | Ashgill Series (OA) — Ashgill Series (OA) | ||
Lithological Description: | Impersistent, locally honeycombed, fine-grained, pale grey, muddy bioclastic limestone with mudstone partings. | ||
Definition of Lower Boundary: | Locally unconformable on various Caradoc strata. | ||
Definition of Upper Boundary: | Conformable upward passage into the mudstones of the main part of the Moelfryn Mudstone Formation. | ||
Thickness: | To 5m | ||
Geographical Limits: | Data not available. | ||
Parent Unit: | Moelfryn Mudstones Formation (MFN) | ||
Previous Name(s): | Rhiwlas Limestone [Obsolete Name and Code: Use RWL]
(-3655)
Rhiwlas Limestone Formation [Obsolete Name and Code: Use RWL] (-3013) |
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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: | |||
E136 E120 |