Computer Code: |
CWGOT |
Preferred Map Code: |
notEntered |
Status Code: |
Full |
Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
Lithological Description: |
Poorly sorted, heterolithic, felsic tuff with clasts of rhyolite, tuff and sedimentary rocks, interbedded with volcaniclastic sandstones and siltstones. |
Definition of Lower Boundary: |
Conformably overlies silty mudstones of the Nant Ffrancon Subgroup. |
Definition of Upper Boundary: |
Conformably overlain by sandstones of the Cwm Eigiau Formation. |
Thickness: |
15m |
Geographical Limits: |
Central Snowdonia. |
Parent Unit: |
Cwm Eigiau Formation (CEI)
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
Capel Curig Volcanic Formation
|
Stratotypes: |
Type Area |
To the west of Dolwyddelan. Howells, M F and Smith, M. 1997. |
Reference(s): |
Howells, M F and Smith, M. 1997. Geology of the country around Snowdon. Memoir of the British Geological Survey, Sheet 119 (England and Wales). (London: The Stationery Office). 104pp. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
none recorded or not applicable |