BGS mineralogy and petrology collection record

Sample number	E39340; COLLNOCE94;
Sample Donor	Evans,C.D.R.
Rock name	'Original entry: Tuff'
Stratigraphy	Not entered
Comments	Section up Lower Rhyolite Tuff (Bidman & Williams, 1931) 316 ft above Base of Unit. Well bedded Upper Member
Locality details	1720 ft due N of Tyddyn Ddol Qry, Blaenau Dolwyddelan
50k map sheet	Snowdon (119) View images in GeoScenic related to 'Snowdon' View the geology near 'Snowdon'
Map reference	SH 7001 5198
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.