José M. Piçarra (1), Juan C. Gutiérrez-Marco (2), Artur A. Sá (3), Carlos Meireles (4) and Emilio González-Clavijo (5)
Silurian graptolite biostratigraphy of the Galicia – Trás-os-Montes Zone (Spain and Portugal)

Keywords
Silurian, Graptolites, Stratigraphy, Palaeogeography, Galicia – Trás-os-Montes Zone, NW Iberian Peninsula

Abstract
Revision and reappraisal of Silurian graptolite data occurring within the Galicia – Trás-os-Montes Zone (NW Iberia) has resulted in a new stratigraphical interpretation of the entire sequence. This is relatively thin, with late Rhuddanian to mid-Telychian black cherts at the base overlain by late Telychian to early Ludfordian black shales, and ending with shales and limestones of Late Silurian age. A total of 10 graptolite biozones was firmly recognized; four others are doubtfully recognized. Palaeogeographical/biogeographical data support the parautochthonous nature formerly assigned to the Silurian succession of the “Schistose Domain”, as not being a direct prolongation of the Silurian of the Central-Iberian Zone.

Author info
1) Dept. de Geologia, INETI, Ap. 104, 7802-901 Beja, Portugal; jose.picarra@ineti.pt 2) Instituto de Geología Económica (CSIC-UCM), 28040 Madrid, Spain; jcgrapto@geo.ucm.es 3) Dept. de Geologia, UTAD, Ap. 1013, 5001-911 Vila Real, Portugal; asa@utad.pt 4) Dept. de Geologia, INETI, Ap. 1089, 4466-956 S. Mamede de Infesta, Portugal; carlos.meireles@ineti.pt 5) Dept. de Geologia, INETI, Ap. 7586, 2720-866 Alfragide, Portugal; emilio.clavijo@ineti.pt

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