BGS mineralogy and petrology collection record

Sample number E1641
Sample Donor Geikie,A.; Teall, J.J.H.;
Rock name 'Original entry: Decomposed Gneiss'
Stratigraphy Not entered
Comments Ordovician. Aranig. See Mem.Geol.of Anglesey pp.328-9 Alkali feldspar, micacised & calcified. Pebble in conglom.
Locality details S.of Porth Helygan
50k map sheet Holyhead (93)

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Map reference SH 491 907
Year collected Not entered 
Bore name Not applicable
Confidentiality No restrictions