Discovery of a fossiliferous horizon in the Anhoa area of the Basses Pyrenees of southwestern France dates as Siegenian or Emsian (lower Devonian) a formation underlain by a shale-sandstone series whose age has been considered either Silurian or Dinantian (Carboniferous). The normal contact with the overlying Devonian rules out a Dinantian age for the shale-sandstone series. The Devonian seems to be transgressive upon the series, indicating a lacuna. Comparison with other localities in the Basque Pyrenees suggests a Caradoc (Ordovician) age for the series.

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