The geology of the Clynnog‐fawr district and Gurn Ddu hills of Northeast Lleyn

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Abstract
This area of Wales is a westerly continuation of the northern limb of the Snowdon syncline and stretches from the Pre‐Cambrian volcanic series in the north to just above the abbreviated Snowdon Volcanic Series in the south. Large parts of the intervening area consist of Caledonian intrusive rocks, but the middle part of the sedimentary succession has yielded scattered graptolites, most and probably all, of Llanvirn age. The exposed volcanic rocks are largely of ignimbrite character while the Caledonian intrusions are of four types (for which chemical analyses are given). The sequence of these four rock‐types and of the structural events of the district is considered.

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