石炭纪 Traditional 石炭紀 Shí tàn jì 🔊 Carboniferous (geological period… + Keep this word Meanings Shí tàn jì name 石炭紀 Carboniferous (geological period 354-292m years ago) Its characters 石shírock炭tànwood charcoalHSK 7–9纪jìorder