BGS mineralogy and petrology collection record

Sample number	E10718; COLLNO119;
Sample Donor	Blake,Professor
Rock name	'Original entry: Felsite'
Stratigraphy	Not entered
Comments	see mem. Geology of Anglesey p 329 Sodium Quartz-felsite with Hornblende Palaeozoic Intrusion
Locality details	Tyn-y-swell S. of railway Llanenchynnedd to Llangarllog & W. of Llanwyllog
50k map sheet	Holyhead (93) View images in GeoScenic related to 'Holyhead' View the geology near 'Holyhead'
Map reference	SH 41 79
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.