白垩系 bái'èxì Cretaceous System Definitions Defs Origin Strokes Stroke Words Sentences Sents 白垩系 白堊系 bái'èxì Cretaceous System The sequence of rock layers formed during the Cretaceous Period, positioned between the Jurassic and Paleogene systems. Frequency Written text 0.106 per million Sources Frequency data BCC Corpus (BLCU)
白垩系 白堊系 bái'èxì Cretaceous System The sequence of rock layers formed during the Cretaceous Period, positioned between the Jurassic and Paleogene systems. Frequency Written text 0.106 per million Sources Frequency data BCC Corpus (BLCU)
