The BGS Lexicon of Named Rock Units — Result Details
Rhiwlas Limestone Member
| Computer Code: | RWL | Preferred Map Code: | notEntered |
|---|---|---|---|
| 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 Formation [Obsolete Name and Code: Use RWL]
(-3013)
Rhiwlas Limestone [Obsolete Name and Code: Use RWL] (-3655) |
||
| 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 | |||