Abstract
Abstract Today, the main flux of sediment from the Iberian Peninsula is carried to the Atlantic Ocean by westerly or northwesterly flowing rivers. The only major contribution of sediment from Iberia to the Mediterranean is that carried by the Ebro River, which flows along a foreland basin before cutting through the Catalan Ranges to form a delta in the adjacent Valencian Trough of the Mediterranean. During the Cretaceous and Early Eocene the sediment flux was to the northwest in this part of Iberia. During Late Eocene-Tortonian times it was mainly centripetal, as in other Tertiary Basins in Iberia. Beginning in the Seravallian-Tortonian the main flux of sediment has been to the adjacent Valencian Trough of the Mediterranean. This change in direction, it is proposed, was initiated in Pre-Messinian times by a small river cutting back into the Ebro Basin by headward erosion and was possibly aided, or even induced, by changes in palaeo-slope during contemporaneous rifting along the Mediterranean coast.
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