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Updated: May 26, 2025
Similar masses occur in North Mayo, south of Belderg Harbour. Cambrian Period. In the Pass of Llanberis, along the banks of Llyn Padarn, masses of quartz-porphyry, felsite and agglomerate, or breccia, indicate volcanic action during this stage. These rocks underlie beds of conglomerate, slate and grit of the Lower Cambrian epoch, and, as Mr.
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