Presence de Trimerocephalus caecus (Gurich, 1896)(Trilobita,Phacopidae) dans le Famennien inferieur du Finistere: Interet stratigraphique et paleogeographique

The revision of the blind Phacopidae of the “Schistes beiges à Dianops” from Finistère which were previouslyassigned to Famennian V, allows that it is Trimerocephalus caecus (GURICH), a characteristical species of Famennian II-III. These shales are the more recent Devonian levels which are known in the Châteaulin Synclinorium.The occurence of this cosmopolitan species indicates that despite a generalized regression in the Finistèreduring the Lower Famennian, communications still existed with the whole european variscan ocean.