| Sample number |
E28016; MR21561; |
| Sample Donor |
Collins,G.H. |
| Rock name |
'Original entry: Tuff' |
| Stratigraphy |
Ordovician. Ordovician. Lower Rhyolitic Tuff |
| Comments |
Welded Tuff. NGR as in register. |
| Locality details |
Quarry name: not recorded: at Roadside Qry. 600 yd SE of Pont y Gromlesh, Llanberis Pass Caernarvonshire |
| 50k map sheet |
Snowdon (119)
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|
| Map reference |
SH 633 563 |
| Year collected |
1958 |
| Bore name |
Not applicable |
| Confidentiality |
No restrictions |