最終更新日：2024/07/28

(geology) Of a geologic period within the Mesoproterozoic era from about 1200 to 1000 million years ago.

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Stennian

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Stennian

adj

(geology) Of a geologic period within the Mesoproterozoic era from about 1200 to 1000 million years ago.

The Stennian period was characterized by intense volcanic activity.

意味（1）

(geology) Of a geologic period within the Mesoproterozoic era from about 1200 to 1000 million years ago.