最終更新日：2024/07/28
The Orosirian period is named after the Orosirian stage of the geologic time scale.
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The Orosirian period is named after the Orosirian stage of the geologic time scale.
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The Orosirian period is named after the Orosirian stage of the geologic time scale.
The Orosirian period is named after the Orosirian stage of the geologic time scale.
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