Carboniferous
Carboniferous /ˌkɑːbəˈnɪfəɹəs/ nghĩa là thuộc kỷ Than đá
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thuộc kỷ Than đá
Of a geologic period within the Paleozoic era; comprises the lower, middle and upper Mississippian and lower, middle and upper Pennsylvanian epochs from about 345 to 280 million years ago, when coal was laid down.