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Moel Oernant
Moel Oernant is a 503m high hill in the community of Trawsfynydd in the county of Gwynedd in North Wales. It has a number of western tops, the highest of which reaches a height of 466m overlooking the waterbody known as Llyn Gelli-Gain and another at Frîdd Wen exceeds 410m. To the south of the lake is the top of Pîg Idris which reaches 429m. The minor top of Y-Foel attains 430m to the northeast of Moel Oernant.
== Geology ==
The hill is formed largely from the mudstones, siltstone and sandstones of the Maentwrog Formation and the siltstones of the underlying Clogau Formation, component units of the Mawddach Group of Cambrian age sedimentary rocks. Sandstones and siltstones of the Gamlan Formation of the Harlech Group are also present. An igneous intrusion of microtonalite lies to the west of the summit and the whole hill is cross-cut by dykes of similar material and later dolerite. Some quartz vein mineralization is recorded within the microtonalite outcrop. A number of faults criss-cross the area, the most significant of which is the broadly north-south aligned Craiglaseithin Fault which runs through the summit of the 466m top. The lower slopes are mantled with a patchy cover of glacial till.〔British Geological Survey 1:50,000 map sheet 135/149 Harlech & accompanying memoir〕
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