Last Updated
：2025/12/07
古原生代
Hiragana
こげんせいだい
Proper noun
Japanese Meaning
古原生代は、地質時代区分の一つで、原生代初期の時代。約25億年前から約16億年前までの期間を指し、地球史において大陸地殻の成長や大気中の酸素濃度の上昇など重要な変化が起こった時代。
Easy Japanese Meaning
とても古いちきゅうのれきしのじだいのなまえで、いまからおよそ25億から16億年前ごろ
Sense（1）
the Paleoproterozoic era
（ canonical ）
（ romanization ）
（ hiragana ）
Quizzes for review
See correct answer
古原生代
See correct answer
The Paleoproterozoic era was a very important period in the history of the Earth.
The Paleoproterozoic era was a very important period in the history of the Earth.
See correct answer
古原生代は地球の歴史の中で非常に重要な時期でした。
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