What is recorded here
Great Gully is a sea cliff composed of Silurian greywacke and slate, formed through volcanic and sedimentary processes around 440–420 million years ago. The cliff is notable for its steep topography and exposure of ancient rock layers, typical of the North Wales Caledonide mountain belt.
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Places near here
Craig yr YsfaCliff · 194 yd
Earthen Pots', Find Spot, Cwm LlugwyFindspot · 788 yd
Cwm Eigiau House IIHouse · 842 yd
Cwm Eigiau Slate QuarrySlate Quarry; Slate Processing Works · 922 yd
Pen yr Helgi Du summit cairnAncient tomb or cairn · 998 yd
Pen yr Helgi DuMountain / peak · 1146 yd
Carnedd LlewelynMountain / peak · 1195 yd
Craig y LlynCliff · 1283 yd
The mountain wall and Creigiau HirionMountain or hill · 1757 yd
Mountain wall and Creigiau Malwod crags above RhiwlasMountain or hill · 1.3 mi
Waterfall and doleriteWaterfall · 2.6 mi
The Enormous Screes of Yr Ole Wen Tower Above Ogwen's OutfallCastle, fort or tower · 3.4 mi