The end of the sedimentation as a endorheic drainage basin and the beginning of the present erosive cycle in the tertiary Ebro Basin has been attributed until now to the fluvial incision during the "Messinian Crisis". The consideration of diverse types of data as a whole indicates that the erosive emptying could have initiated previously and will be in relation with the beginning of the deposition of the Castellón Group in the Valencia Trough (late Serravallian and Tortonian) and not with the sedimentation of the Ebro Group (Pliocene and Quaternary), since it had been assumed until now. This hypothesis would explain diverse geologic facts such as the absence ofTurolian (late Tortonian and Messinian) paleontological sites in the Ebro Basin, the big thickness of sediments that, in spite of the intense Messinian erosion, the Castellón Group presents, the momentarily change of the Duero Basin to unclose conditions at the end of the Aragonian (late Serravallian - early Tortonian) or the beginning of the open and erosion conditions in the Calatayud Basin during in the early VaUesian (Tortonian).
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