Computer Code: |
MTGM |
Preferred Map Code: |
notEntered |
Status Code: |
Pending Upgrade |
Age range: |
Caradoc Series (O4)
— Caradoc Series (O4) |
Lithological Description: |
Porphyritic microgranite composed of perthite phenocrysts with lesser plagioclase and minor green biotite in an equigranular, unfoliated, granophyric groundmass |
Definition of Lower Boundary: |
Not seen. |
Definition of Upper Boundary: |
Not seen. |
Thickness: |
Unknown. |
Geographical Limits: |
none recorded or not applicable
|
Parent Unit: |
Not Available (!)
|
Previous Name(s): |
Mynydd Tir-Y-Cwmwd Granophyric Microgranite [Obsolete Name and Code: Use MTGM]
(-1712)
|
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
|