奥陶纪 àotáojì Ordovician period Definitions Defs Origin Strokes Stroke Words Sentences Sents 奥陶纪 奧陶紀 àotáojì Ordovician period The second geological period of the Paleozoic Era, occurring approximately 485 to 444 million years ago; characterized by limestone and shale deposits and the dominance of marine life like graptolites and trilobites Frequency Written text 0.091 per million Cross-References Referenced by 寒武纪 hánwǔjì志留纪 zhìliújì Sources Frequency data BCC Corpus (BLCU)
奥陶纪 奧陶紀 àotáojì Ordovician period The second geological period of the Paleozoic Era, occurring approximately 485 to 444 million years ago; characterized by limestone and shale deposits and the dominance of marine life like graptolites and trilobites Frequency Written text 0.091 per million Cross-References Referenced by 寒武纪 hánwǔjì志留纪 zhìliújì Sources Frequency data BCC Corpus (BLCU)
