| Computer Code: |
PNR |
Preferred Map Code: |
Pr |
| Status Code: |
Pending Upgrade |
| Age range: |
St David's Series (ED)
— Merioneth Series (EM) |
| Lithological Description: |
Locally recognisable member of the Maentwrog Formation (Pratt, Woodhall and Howells, 1995). |
| Definition of Lower Boundary: |
none recorded or not applicable
|
| Definition of Upper Boundary: |
none recorded or not applicable
|
| Thickness: |
none recorded or not applicable
|
| Geographical Limits: |
none recorded or not applicable
|
| Parent Unit: |
Maentwrog Formation (MW)
|
| Previous Name(s): |
Penrhos Slates [Obsolete Name And Code: See PNR]
(PESL)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| Rushton, A W A and Howells, M F. 1998. Stratigraphical framework for the Ordovician of Snowdonia and the Lleyn Peninsula. British Geological Survey Research Report, RR/99/08. |
| Pratt, W T, Woodhall, D G and Howells, M F. 1995. Geology of the country around Cadair Idris. Memoir of the British Geological Survey, Sheet 149. (England and Wales). (London: HMSO), 111pp |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E149
|
