The granite caves known on the western coast of Galicia have prehistoric sites of all the Recent Prehistory in the northwest of the Iberian Peninsula: Neolithic, Copper and Bronze Age. However, for the time being it is very little the interest shown by archaeology when it comes to taking interest in the study of these subterranean areas. We contribute a view of synthesis and, thanks to the formal study of the artefacts, especially the metallic and ceramic ones, we dated each one of the sites. A

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... significant number of granite caves show a specific type of artefact , Muíños Rupestres ("Rupestrian Mills") that singularly characterise the same coastal territory in Galicia continuing in the north of Portugal.