Read Edit View history 元古代 yuángǔdài Proterozoic Era Origin Definitions Defs Strokes Stroke Words Sentences Sents Senses Add sense 元古代 yuángǔdài Proterozoic Era Proterozoic geological era, occurring approximately 2500 to 541 million years ago Edit Delete References Add reference No references for this word.
元古代 yuángǔdài Proterozoic Era Proterozoic geological era, occurring approximately 2500 to 541 million years ago Edit Delete