Ordered by the number of climbs recorded. About rhyolite.
| Crag | Location | # Climbs |
|---|---|---|
| Clogwyn y Bustach | United Kingdom / Wales / Blaenau Ffestiniog | 1 |
| Craig yr Ogof | United Kingdom / Wales / Caernarfon | 1 |
| Pontesford Rocks | United Kingdom / Shrewsbury | 1 |
| Thornhow Crag | United Kingdom / England / Westmorland and Furness / Penrith | 1 |
| Blake Rigg | United Kingdom / England / Westmorland and Furness / Ambleside | 1 |
| Craig Yr Wrysgan | United Kingdom / Wales / Blaenau Ffestiniog | 1 |
| Sampsons Stones | United Kingdom / England / Cumberland / Seascale | 1 |
| Grange Campsite | United Kingdom / England / Keswick | 1 |
| Elephantitus Cave | United Kingdom / Wales / Caernarfon | 1 |
| Cwm Glas Bach Boulders | United Kingdom / Wales / Caernarfon | 1 |
| Gelli Boulder | United Kingdom / Wales / Betws-y-Coed | 1 |
| Stirrup Boulders | United Kingdom / England / Cumbria / Seascale | 1 |
| Blowup Nose | United Kingdom / Scotland / Aberdeen | 1 |
| Brow Side | United Kingdom / England / Broughton-in-Furness | 1 |
| Fox Crag | United Kingdom / England / Broughton-in-Furness | 1 |
| Wallowbarrow Gorge | United Kingdom / England / Cumbria / Broughton-in-Furness | 1 |
| Mosedale Crags | United Kingdom / England / Cumberland / Seascale | 1 |
| The Y-Boulder | United Kingdom / England / Cumberland / Seascale | 1 |
| The Eckenstein Boulder | United Kingdom / Wales / Caernarfon | 1 |
| Intake Ridge | United Kingdom / England / Keswick | 1 |