Computer Code: |
GT |
Preferred Map Code: |
notEntered |
Status Code: |
Pending Upgrade |
Age range: |
Soudleyan Substage (OY)
— Soudleyan Substage (OY) |
Lithological Description: |
White weathering, primary felsic ash-flow tuff. |
Definition of Lower Boundary: |
Highly discordant on mudstones of the Nant Ffrancon Subgroup. |
Definition of Upper Boundary: |
Conformably overlain by silty mudstones and fine grained sandstones of the Capel Curig Volcanic Formation. |
Thickness: |
40m |
Geographical Limits: |
Not specified. |
Parent Unit: |
Capel Curig Volcanic Formation (CCV)
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
none recorded or not applicable |
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: |
E120
|