RT Journal Article T1 Facies diagráficas en el subsuelo terciario de la provincia de León (Formación Mansilla) T1 Electrofacies in the tertiary subsoil of the Leon province (Mansilla formation) A1 Herrero, A. AB They are analized the electric logs of a several wells located in the region northwest of the Duero Basin. These wells cross the upper 700 m of the Candanedo Aloestratigraphic Unit (Mansilla Formation). In them are differentiated three principal electrofacies: river channel, flood plain and of progradational lobe. The electrosequential analysis shows the retrogradation of the distal facies on proximal facies in upper part of the unit PB Sociedad Geológica de España YR 2004 FD 2004 LK http://hdl.handle.net/10272/17938 UL http://hdl.handle.net/10272/17938 LA spa DS Repositorio Institucional de la Universidad de Huelva RD 31 may 2026