BGS mineralogy and petrology collection record

Sample number	E8385; MR8041;
Sample Donor	Butler,A.J.
Rock name	'Original entry: Proterobase'
Stratigraphy	Not entered
Comments	Probably hybrid granophyre base
Locality details	Penafynydd Rhiw, Lleyn Peninsula
50k map sheet	Pwllheli (134) View images in GeoScenic related to 'Pwllheli' View the geology near 'Pwllheli'
Map reference	SH 220 267
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.