The San Pedro field produces about 10 percent of the crude oil of Argentina. The oil zones in the field are just above the Devonian in the glacial sediments of the Permo-Carboniferous. "The oil fields.... are unique among those of the world in their relatively great disparity between the deposition of the source beds (Devonian) and the first folding (late Tertiary) which could have afforded accumulation. From this it is inferred that possibly the generation and migration of oil from a source bed could be postponed, without adverse results, until the advent of the first effective folding."

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