Last Updated
：2025/11/20
Noachian epoch
Proper noun
Japanese Meaning
火星の地質年代の最も初期の時代で、約38億年前から35億年前にあたり、多数の巨大衝突クレーターが存在し、その後ヘスペリアン期へと移行する時代を指す。
（ canonical ）
Quizzes for review
The earliest of the Martian geologic epochs, approximately from 3,800 million years ago to 3,500 million years ago, marked by many large impact craters and followed by the Hesperian epoch.
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Noachian epoch
During the Noachian epoch, Mars was pelted by massive impacts that shaped much of its ancient terrain.
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During the Noachian epoch, Mars was pelted by massive impacts that shaped much of its ancient terrain.
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