Computer Code: |
PNBA |
Preferred Map Code: |
notEntered |
Status Code: |
Pending Upgrade |
Age range: |
Onnian Substage (ON)
— Onnian Substage (ON) |
Lithological Description: |
Feldspar porphyritic and highly vesicular basaltic andesite. |
Definition of Lower Boundary: |
Intrusive contact coincident with the base of the Nod Glas Formation (qv). |
Definition of Upper Boundary: |
Within the Nod Glas Formation (qv). |
Thickness: |
To 40m |
Geographical Limits: |
none recorded or not applicable
|
Parent Unit: |
Not Available (!)
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
none recorded or not applicable |
Reference(s): |
Young, T P, Gibbons, W and McCarroll, D. 2002. Geology of the country around Pwllheli. Memoir of the British Geological Survey, Sheet 134 (England and Wales). |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
E134
|