7 - Cemaes Bay to City Dulas
Tyllau Duon
Looking over Tyllau Duon towards Trwyn Eilian / Point Lynas.
The Llaneilian Slate Works operated the Tyllau Duon Quarry on this exposed and difficult cliff site .
One of only two slate Quarries on Anglesey.
Tyllau Duon means "black holes".
Ref: NW 2538
Date: 02/09/2023
Location: SH 4821 9239
