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The oldest building stone mines in the calcarenites were claimed by some to have been made by the Romans. Historical documents and inscriptions in the mines of the St.Pietersberg suggest that the room and pillar workings came into being in the 13th century. The first exploitation in the St.Pietersberg was probably carried out by monks from a nearby monastery.
Carbon-14 dating has confirmed that the drawings were made in the Middel Ages.
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