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  • Birinci Çağın dördüncü dönemi ve bu dönemde oluşmuş yer tabakaları. (tr)
  • The Devonian is a geologic period and system of the Paleozoic, spanning 60 million years from the end of the Silurian, 419.2 million years ago (Mya), to the beginning of the Carboniferous, 358.9 Mya. (en)

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