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出典:Wiktionary
From Ancient Greek στενός (stenós, “narrow”).
Stenian
出典:Wikipedia
出典:『Wikipedia』 (2011/02/20 08:54 UTC 版)
The Stenian (from Greek stenos, "narrow") is the final geologic period in the Mesoproterozoic Era and lasted from 1200 Mya to 1000 Mya (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically.