serie NOVA TERRA nº 49

111 of Schist and Greywacke Complex (SGC) ( Carrington da Costa, 1950 ) and it includes an extensive sequence of pre-Ordovician shales and sand- stones, post-orogenic granitoids, and large areas with low to very low grade metamorphism. The boundary between these two domains of the CIZ is gradational, and consists of a transitional zone that combines char- acteristics of the Ollo de Sapo and the SGC. The SGC has been divided into different lithostratigraphic units, main- ly depending on the author and the area of study ( Alvarez Nava et al., 1988; Díez Fernández et al., 2013; Pieren, 2000; San José et al., 1990; Vidal et al., 1994b ). Yet, two clearly differentiated units can be distin- guished: the Lower Unit and the Upper Unit ( Rodríguez Alonso et al., 2004a ). The Upper Unit can be further divided in Upper Alcudian and the Pusa Group. Upper Alcudian includes Late Ediacaran and Early Cam- brian rocks, whereas the Pusa Group is Early Cambrian since its base. The Lower Unit crops out extensively in the central and southern part of the CIZ (Alcudia Anticline and its extension to the NW, in Fig. 2. Geological map of the southern part of the Central Iberian Zone (modi fi ed after IGME, 1994 and Pieren, 2000 ). Sampling locations of the Ediacaran and Cambrian samples are included. Puente Génave – Castelo de Vide Detachment is also included ( Martín Parra et al., 2006 ). 17 J.M. Fuenlabrada et al. / Tectonophysics 681 (2016) 15 – 30