BGS mineralogy and petrology collection record

Sample number	E10109; COLLNO321;
Sample Donor	Greenly,E.
Rock name	'Original entry: Grey Chert Like Rock'
Stratigraphy	Not entered
Comments	Not entered
Locality details	Llanddwyn Is.N.side of Porth yr Ogof
50k map sheet	Caernarfon (105) View images in GeoScenic related to 'Caernarfon' View the geology near 'Caernarfon'
Map reference	SH 386 629
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.