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Numerous seepages and showings of oil in wells have encouraged prospecting in the Limagne graben near Clermont-Ferrand near the Volcanic Chain of the Puys. The seepages are most numerous in rock of an exceptional type, called peperite, which is a form of agglomerate of sedimentary rocks in eruptive rocks. The role of volcanic intrusions appears to have been destructive, rather than constructive, and to have distilled away the lighter hydrocarbons.
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