The researchers studied the evolution of the forearc system in SW Ecuador using field observations, dating techniques, and seismic records. They found that sedimentation in the area started around 61 million years ago with the accretion of SW Ecuador against the South American continental margin. The formation of an accretionary prism followed, possibly beginning around 55 million years ago. Between 54 million years ago and 40 million years ago, there was evidence of normal faulting and extensional processes. The forearc basin developed around 32-30 million years ago, with sedimentation in shallower environments. From 30 million years ago to 10 million years ago, the forearc basin was characterized by shallow water deposits influenced by tidal dynamics. The outer forearc high played a role in shaping the forearc depocenter for about 20 million years.