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... > geologic time scale > geological age > Phanerozoic > Paleozoic > Devonian > Lower Devonian > Helderbergian

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Helderbergian  

Definición

  • The Helderbergian is a lowermost Devonian stage in North America, above Upper Silurian, below Oriskanian; from the Helderberg Mountains, New York. (Adapted from: Moureau M. & Brace G. (2000). Comprehensive Dictionary of Earth Science - Dictionnaire des Sciences de la Terre. Paris, Technip.)

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http://data.loterre.fr/ark:/67375/QX8-56KJKDFW-0

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