The geological layer structure comprises Cambrian, sedimentary, volcanic and intrusive rocks from the lower Palaeozoic age age approximately 4.5km thick. I hope I’ve got that correct, Mr Law?
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Marians on The Mawddach 
Only that the marginal rocks south and north of the central core comprise interbedded sedimentary rocks and intruded and deposited air fall volcanic ashes of Ordovician age. These having been eroded and removed from the central core region made up of the Rhinog Mountains in the years following the Caledonian Orogeny and Alpine earthstorm.