Devonian system

層位学・地史学・古地理学
Related terms (1)：

Devonian Period (デボン紀)
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Broader terms (1)：

Narrower terms (5)：

Lower Devonian (下部デボン系)
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Middle Devonian system (中部デボン系)
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Upper Devonian series (上部デボン系)
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Frasnian stage (フラニアン階)
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Givetian stage (ジベティアン階)
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