Proterozoic eon

1. The Proterozoic climate was still warm and wet, but compared with that of the Archaeozoic Eon, the temperature fell a little.
   元古宙的气候仍是温暖而潮湿的，但较太古宙温度有所降低。
2. Developmental features of the Middle-Upper Proterozoic Eon in East China and its significance in the study of plates and geotexture
   中国东部中上元古宇发育特征及其对板块和地体构造研究的意义

noun

1. from 2,500 to 544 million years ago

   Synonym:    ProterozoicProterozoic aeon