地质年代表 dìzhìniándàibiǎo geological time scale Origin Definitions Defs Strokes Stroke Words Sentences Sents 地质年代 地質年代 dìzhìniándài geological era The sequence of periods in Earth's history based on the formation of rock layers and evolution of life; includes both relative age and absolute age determined by isotopes表 biǎo noun table a table; list; chart; form for listing information