The Ediacaran–Miaolingian Schist-Greywacke Complex (XGC) covers a large area of central Portugal and extends eastward to Spain. Traditionally, the XGC strata have been associated with the Beiras and Douro groups. In the present revision, the description is made according to two geographical sectors: the Beiras and Douro Valley regions. The Beiras region is subdivided into (i) the Erges-Tejo Rivers and Sertã-Caramulo, and (ii) the Malcata and Marofa ridges. The lithological composition of both sectors is dominated by siliciclastic sedimentary rocks that broadly shallow upsection from deep-water turbidites to deep-water offshore to shoreface environments. A key marker bed is represented by the occurrence of glaciogenic diamictites at the top of the corresponding stratigraphic units. The stratigraphic succession of the Malcata and Marofa ridges is also dominated by siliciclastic strata. It is noticeable the occurrence of black shales embedded in the upper unit of the Malcata Ridge and arkosic interbeds at the top of the Marofa lithological succession. Two sectors are recognized in the Douro Valley region, named Alto Douro and Paiva-Valongo. The Alto Douro succession corresponds to the classical Douro Group, which integrates six formations (three units tectonically duplicated), mostly interpreted as deep turbidites, although shallow-water interbeds have been recently identified. The lithological succession of the new Paiva-Valongo sector has been traditionally correlated with that of the Alto Douro sector. However, the occurrence of shallow-water strata at the lower part of the succession, the abundance of channelized matrix- and clast-supported conglomerates, and restricted felsic and mafic volcanism suggest deposition in a distinct depocenter. Tentative correlations with Spain suggest that the units of the Erges-Tejo Rivers and Sertã-Caramulo sectors may represent the prolongation of the Lower Alcudian-Domo Extremeño Supergroup, whereas the Malcata Ridge units may be correlatable with the Cíjara Formation, and the Marofa Ridge would represent the prolongation of the Salamanca region units. The correlation of the Douro Valley units with Spain units remains unclear.