proterozoic stratum 元古代层
Early Proterozoic 早元古代
mid-Proterozoic ice age 中原生代冰期
Middle-Upper Proterozoic 中上元古界
Upper Proterozoic 上元古界
early-middle proterozoic 早中元古代
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"proterozoic life forms"
以上来源于: WordNet
N 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 of or formed in the late Precambrian era 原生代的
The history of Earth is divided into four eons —starting with the earliest, these are the Hadean, Archean, Proterozoic, and Phanerozoic.
地球的历史可分为四个时期——依次经历冥古代、太古代、元古代和显生宙。
The history of Earth is divided into four eons - starting with the earliest, these are the Hadean, Archean, Proterozoic, and Phanerozoic.
地球的历史可分为四个时期——依次经历冥古代、太古代、元古代和显生宙。
Dating from the Eocene Epoch, the crater is likely less than 50 million years old, but the impact bored into Proterozoic sandstones well over 500 million years old.
它形成于始新世,距今可能不到5000万年,但是撞击钻入的原生代砂岩都已经超过5亿年。
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