Computer Code: |
VGR |
Preferred Map Code: |
Vg |
Status Code: |
Pending Upgrade |
Age range: |
St David's Series (ED)
— Merioneth Series (EM) |
Lithological Description: |
Locally recognisable member of Maentwrog Formation. |
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): |
Vigra Beds [Obsolete Name And Code: Use VGR]
(VIB)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
none recorded or not applicable |
Reference(s): |
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 |
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. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
E149
|