The Huallaga foreland basin evolution : thrust propagation in a deltaic environment, northern Peruvian Andes Hermoza, W. /Brusset, S. /Baby, Patrice Gil, W. Roddaz, M. /Guerrero, N. Bolanos, M. deltaic and estuarine deposits eocene foreland basing Huallaga basin miocenc Peru petroleum systems sub Andean The sub-Andean Huallaga basin is part of the modern retroforeland basin system of Peru. It corresponds to a thrust-and-fold belt superimposed on inverted and halokinetic structures and is characterized by Eocene-Pliocene, thick synorogenic series that have controlled the burial history of petroleum systems. Sedimentological analysis and a sequentially restored cross-section based on seismic data and new field studies show three sequences of synorogenic deposits. The Eocene (Lower Pozo member) developed in shoreface environments, when the basin morphology corresponded to a foresag depozone linked to an orogenic unloading period. The Middle Eocene sequence (Upper Pozo member) developed in shallow marine environments and recorded a change in Andean geodynamics and the retroforeland basin system. The basin morphology corresponded to a foredeep depozone linked to an orogenic loading period. This configuration remained until the Middle Miocene (Chambira Formation). The Middle Miocene-Pliocene sequence recorded the onset of the modern sub-Andean Huallaga basin that became it wedge-top depozone. Thrust propagation occurred in a deltaic environment, which evolved progressively to an alluvial system linked to the modern Amazon River. (c) 2005 Published by Elsevier Ltd. 2005 text https://www.documentation.ird.fr/hor/PAR00000447 PAR00000447 Hermoza W., Brusset S., Baby Patrice, Gil W., Roddaz M., Guerrero N., Bolanos M.. The Huallaga foreland basin evolution : thrust propagation in a deltaic environment, northern Peruvian Andes. 2005, 19 (1), 21-34 EN