Stages of sedimentary prism development on a convergent margin - Eocene Tyee Forearc Basin, Coast Range, Oregon, USA

► Basin-margin sediment wedge developed in Eocene Tyee Forearc Basin in two stages. ► Small clinoforms and sandy unconfined slope deposits characterize the early stage. ► The later stage is characterized by larger clinoforms with channels on the slope. ► The two-stage development is largely controlled by the preexisting basin-topography.