BGS mineralogy and petrology collection record

Sample number E40120; COLLNOCE154;
Sample Donor Evans,C.D.R.
Rock name Not entered
Stratigraphy Not entered
Comments Isolated tuff sticking out of dolerite intrusion ; Nr. Roman Rd.
Locality details 490 ft 20 deg from Cairns in Bwlch y Ddeu Faen
50k map sheet Bangor (106)

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Map reference SH 7171 7176
Year collected Not entered 
Bore name Not applicable
Confidentiality No restrictions

Petrological thin sections

Links to high resolution images

Transition from XPL to PPL light


E40120

Cross Polarized, E40120

Plane Polarized, E40120

Plane Polarized, E40120