The stratigraphy and palaeontology of the Ordovician to Devonian rocks of the area north of Dornes (near Figueiródos Vinhos), central Portugal.

The Ordovician, Silurian and lower Devonian rocks of the Domes area (near Figueiro dos Vinhos), in central Portugal, form a continuous sedimentary sequence approximately 1450m thick. Folded Pre-Ordovician "Complexo xisto-grauvaquico" (CXG) is unconformably overlain by a transgressive quartzite, mudstone and greywacke succession of four Ordovician formations which are locally shelly and graptolitic. These formations are: Serra do Brejo Formation, Brejo Fundeiro Formation, Monte da Sombadeira Formation and Monte do Carvalhal Formation. The Ordovician rocks are conformably overlain by a Silurian sequence of graptolitic mudstones passing upwards into sandstones; these beds include the Vale da Ursa Formation, Foz da Serta Formation, Vale do Serräo Formation, Serra da Mendeira Formation and part of the Serra do Luacäo Formation. The Devonian rocks are represented by part of the Serra do Luagao Formation and the Dornes formation, a sandstone-madstone sequence passing up into Shelly limestones. Most of the Ordovician faunas are described and discussed including sixteen species of trilobite, five species of brachiopod and eleven ichnospecies of trace fossil. Faunal lists of material identified by specialists in the fields of Ordovician and Silurian graptolites, Ordovician echinoderms, Devonian brachiopods and Silurian microfossils are also given. The Ordovician faunas belong to the Selenopeltis province and show close links with those of Spain, France, Morocco and Bohemia. The correlation and palaeogeography of the Dornes area is discussed with emphasis on the Ordovician Period in the Ibero-Armorican area