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Geology| 1. | noting or pertaining to a period of the Paleozoic Era, including the Pennsylvanian and Mississippian periods as epochs, occurring from 345 million to 280 million years ago. |
| 2. | (lowercase ) producing carbon or coal. |
| 3. | the Carboniferous Period or System. |
Car·bon·if·er·ous (kär'bə-nĭf'ər-əs) adj.
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