No remains.
Originally part of Ty Mawr East - worked in 1890s by John Ffowc Williams
Publications (1)
- Richards, Alun John (1991); Gazeteer of the Welsh Slate Industry, A; Gwasg Carreg Gwalch 978-0863811968
Twll John Ffowc
Slate Quarry
Worked from 1890s
Jan 1st, 2024 from GWSI by Buddle-Bot
Nov 18th, 2025 by BertyBasset
 | |
| North Wales | |
| Talysarn | |
| 53.0486031, -4.2421641 | |
| SH 4980 5250 | |
| Private Land | |
| 110m | |
| #1,300 | |
Nantlle Vale - 141m- Gwernor - 199m
- Ty Mawr Green - 282m
- Ty Mawr West - 315m
Gwernor - 390m- Ty'n y Weirglodd - 446m
- Cornwall - 572m
- Plas Du - 726m
- Dorothea - 727m
- Tanrallt - 759m
- Coed Madog - 775m
- Cloddfa'r Coed - 805m
- Singrig - 852m
- Twll Coed - 870m
- Tal y Sarn - 892m
- Pwll Fanog - 893m
- Gallt y Fedw - 1,004m
- Twll Balast - 1,034m
- Twll Llwyd - 1,061m
- Blaen y Cae - 1,081m
- Allt Llechi - 1,155m
- Fronlog - 1,202m
- Cloddfa Lon Twll Mawr - 1,211m
- Taldrwst - 1,250m
- Wern Ifan - 1,365m
- Nant y Fron - 1,386m
- Cilgwyn - 1,394m
- Pen y Bryn - 1,507m
- Tyddyn Agnes - 1,717m
- Ty'n y Llwyn - 1,817m
- Pen yr Orsedd - 1,850m