| Computer Code: |
GBDA |
Preferred Map Code: |
notEntered |
| Status Code: |
Pending Upgrade |
| Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
| Lithological Description: |
Porphyritic dacite with phenocrysts of andesine and glomeroporphyritic plagioclase clots, rare microdioritic xenoliths, minor amounts of zircon, apatite and altered mafics in a finely recrystallized felsitic groundmass. |
| Definition of Lower Boundary: |
Not seen. |
| Definition of Upper Boundary: |
Not seen. |
| Thickness: |
Unknown. |
| Geographical Limits: |
Not specified. |
| Parent Unit: |
Carn Fadryn Suite (CAFA)
|
| 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
|
