BGS mineralogy and petrology collection record

Sample number	E8409; COLLNO4;
Sample Donor	Calloway, G.A.
Rock name	'Original entry: Felsite'
Stratigraphy	Not entered
Comments	See Mem.Geol.of Anglesey cf pp.332-3. Mona Complex? Plutonic Intrusion? Slide thick. Seems a clastic hornfels, but doubtful
Locality details	Penclegyn [Penclegir] NE.of Gwalchmai
50k map sheet	Holyhead (93) View images in GeoScenic related to 'Holyhead' View the geology near 'Holyhead'
Map reference	SH 390 767
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.