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Precise zircon and monazite ID-TIMS U–Pb dating of three Lower Ordovician altered ash-fall tuff beds (K-bentonites) in the Cantabrian Zone of NW Iberia yielded coeval ages together with an equivalent previously studied sample (477.5±1 (Gutierrez-Alonso et al., 2007)), of 477±1.3Ma, 477.2±1.1Ma and 477.3±1Ma, with a pooled concordia age (all analyses in the four samples) of 477.2±0.74Ma. A conservative...
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