RT Journal Article T1 Estratigrafía del llerdiense en la región de Tremp (cuenca de Graus-Tremp, NE de España) T1 Stratigraphy of the Her di an in the Tremp region (Graus-Tremp basin, NE of Spain) A1 Barberà, X. A1 Marzo, M. A1 Reguant, Salvador A1 Serra Kiel, Josep A1 Samsó, Josep Maria A1 Tosquella Angrill, Josep AB A new stratigraphic subdivision of the Herdian stratotype in the Tremp basin is proposed. The Figols Croup has been defined as a new unit which comprises a succession of shallow marine sediments about 750 m thick. This group is formed by three formations and nine members and was deposited between 55.7 Ma and 52.5 Ma, contemporaneously to the emplacement of the Montsec thrust sheet. A new correspondence between macroforaminifera biozones and lithostratigraphic units is proposed. The Figols Croup records a vertical evolution characterized by the superposition of carbonatic, litharenitic and arkosic materials which coincides with the three defined formations PB Sociedad Geológica de España YR 1996 FD 1996 LK http://hdl.handle.net/10272/11384 UL http://hdl.handle.net/10272/11384 LA spa DS Repositorio Institucional de la Universidad de Huelva RD 30 may 2026