This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Containing or producing carbon

"The group with which we have to deal is called the carboniferous or coal bearing system, and it includes four classes of rocks, viz.: 1, sandstone; 2, shale or bind; 3, limestone; 4, coal and underclay."

geological period    period   

Geologic timescale   

coniferous    fossiliferous    vociferous   

Devonian    fossiliferous    Cretaceous    schistose    tertiary    unconsolidated    Alpine    geologic    Mesozoic    siliceous