BGS mineralogy and petrology collection record

Sample number	E10881; COLLNO282;
Sample Donor	Blake,Professor
Rock name	'Original entry: Thermally Altered Mica-Quartz-Schist'
Stratigraphy	Not entered
Comments	Palaeozoic Intrusions. See Mem.Geol.of Anglesey.cf.p.519. A Pen-Zone mica schist, but seems thermally altered by dolerite dyke
Locality details	Rock next to intrusive dyke, cutting of Berw-uchaf
50k map sheet	Caernarfon (105) View images in GeoScenic related to 'Caernarfon' View the geology near 'Caernarfon'
Map reference	SH 465 712
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.