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1 The earliest age in the Devonian Period, preceded by the Silurian, followed by the Siegennian, and dated at 416–411.2 Ma.

2 The name of the corresponding European stage, which is roughly contemporaneous with the Crudinian (Australia) and the lower/middle Helderbergian (N. America). The boundary (also the Silurian–Devonian boundary) stratotype section is at Klonk, near Prague.

Subjects: Earth Sciences and Geography.

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