proterozoic stratum元古代层
Proterozoic Eonothem元古宇
Proterozoic basement元古宙基底
proterozoic era元古代;原生代
proterozoic ĥ元古代
proterozoic collision元古代碰撞
proterozoic profile元古界剖面
Proterozoic granitoids元古宙花岗岩
new proterozoic新元古代
N（名词） the later of two divisions of the Precambrian era, during which the earliest plants and animals are assumed to have lived 原生代 → compare Archaeozoic
ADJ（形容词） of or formed in the late Precambrian era 原生代的