石炭系 shítànxì Carboniferous system Definitions Defs Origin Strokes Stroke Words Sentences Sents 石炭系 shítànxì Carboniferous system The system of rock layers deposited during the Carboniferous period coal measures A sequence of rock strata containing numerous coal seams, typically from the Carboniferous period Frequency Written text 0.253 per million Sources Frequency data BCC Corpus (BLCU)
石炭系 shítànxì Carboniferous system The system of rock layers deposited during the Carboniferous period coal measures A sequence of rock strata containing numerous coal seams, typically from the Carboniferous period Frequency Written text 0.253 per million Sources Frequency data BCC Corpus (BLCU)
