Impose a rectangular grid of maps onto a country like Britain and there are bound to be some unlucky areas that contain considerably more sea than land. Such a geological map sheet is Pwllheli, on the south side of the Llŷn peninsula, North Wales. Fortunately this corner of Wales has a geological richness out of all proportion to its size. Precambrian melange and an intrusive complex are cut by the major Llŷn shear zone. Cambrian turbidites are overlain with spectacular unconformity by a near-complete Ordovician sequence comprising sediments and varied Caradoc magmatic rocks. Syngenetic and epigenetic mineralization and a varied...
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