Arche, A., Díez, J.B., and López Gómez, J. 2007. Identification of the Early Permian (Autunian) in the subsurface of the Ebro Basin, NE Spain, and its paleogeographic consequences. Journal of Iberian Geology 33, 1, 125–133. Retrieved December 6, 2025 from https://revistas.ucm.es/index.php/JIGE/article/view/JIGE0707120125A