| Computer Code: |
LVT |
Preferred Map Code: |
LVT |
| Status Code: |
Full |
| Age range: |
Soudleyan Substage (OY)
— Soudleyan Substage (OY) |
| Lithological Description: |
Ash-flow tuffs, welded. |
| Definition of Lower Boundary: |
Local members within Capel Curig Volcanic Formation. |
| Definition of Upper Boundary: |
Not defined. |
| Thickness: |
none recorded or not applicable
|
| Geographical Limits: |
Northern and central Snowdonia. |
| Parent Unit: |
Capel Curig Volcanic Formation (CCV)
|
| Previous Name(s): |
Garth Tuff [Obsolete Name and Code: Use LVT]
(-3544)
|
| Alternative Name(s): |
Garth Tuff
|
| Stratotypes: |
| Type Area |
About anticline in the Lledr Valley. |
| Reference(s): |
| Howells, M F, Francis, E H, Leveridge, B E and Evans, C D R, 1978. Classical areas of British Geology. Capel Curig and Betws-y-Coed. Description of 1:25 000 Sheet SH75. London: HMSO for Institute of Geological Sciences. |
| 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. |
| Howells, M F, Reedman, A J and Campbell, S D G, 1991. Ordovician (Caradoc) marginal basin volcanism in Snowdonia (north-west Wales). (London: HMSO for the British Geological Survey). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E119
|
