BGS mineralogy and petrology collection record

Sample number	E63675; COLLNOKB675;
Sample Donor	Not entered
Rock name	Tuff. 'Original entry: Acid Ash Flow Tuff'
Stratigraphy	Not entered
Comments	5m above base(GROUP= )(FORM= Nant Ffrancon Fm.)(MEMB= Y Glog Unit 1.)(IE=E)(TEXTURE=welded
Locality details	Portmadog, at Ynys cerig-duon
50k map sheet	Snowdon (119) View images in GeoScenic related to 'Snowdon' View the geology near 'Snowdon'
Map reference	SH 5730 3910
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.