Read Edit View history 石炭纪 Shítànjì Carboniferous Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 石炭纪/石炭紀 · Shítànjì · Carboniferous 2026/03/04 石炭纪 / 石炭紀 Shítànjì Carboniferous Carboniferous (geological period 354-292m years ago) 煤炭主要是在石炭纪时期形成的。 time word created sense Mar 4, 2026, 02:25 AM