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carboniferous (cap.) of, relating to, or designating the geological time period between the Devonian and Permian of the Paleozoic Era, from approximately 350 million to 280 million years ago, when the warm damp climate produced many forests that later formed rich coal deposits. [1/3 definitions]
Permian the Permian Period, or the rock formations that date from that time. [1/2 definitions]