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Lithostratigraphy


Silurian


Not placed in stage

Dolyhir limestone (Wenlock)


Ordovician


Cambrian

Cambrian stage 10Dolgellau formation (Jiangshanian – Cambrian stage 10)
JiangshanianDolgellau formation (Jiangshanian – Cambrian stage 10)
Ffestiniog Flags formation (Paibian – Jiangshanian)
PaibianFfestiniog Flags formation (Paibian – Jiangshanian)
Maentwrog formation (Guzhangian – Paibian)
GuzhangianMaentwrog formation (Guzhangian – Paibian)
DrumianClogau formation
Gamlan formation (Wuliuan – Drumian)
WuliuanGamlan formation (Wuliuan – Drumian)
Barmouth formation
Hafotty formation
Cambrian stage 4Rhinog formation (Cambrian stage 3 – Cambrian stage 4)
Cambrian stage 3Rhinog formation (Cambrian stage 3 – Cambrian stage 4)
LLanbedr formation (Cambrian stage 2 – Cambrian stage 3)
Cambrian stage 2LLanbedr formation (Cambrian stage 2 – Cambrian stage 3)
Dolwen formation