The fact that the river terraces of the Trabancos River cut and cross some terraces of the Duero River indicates the affected Duero River terraces are younger than those not formed from activity of the waters of this river. The ""superficie de Alaejos"" carve-out intrudes 4 to 6 meters into the Duero River terrace designated TD-7 (+74/80 m) to the northwest of Siete Iglesias de Trabancos village. Likewise, the TT-2 fluvial terrace of Trabancos cuts some Duero River terraces. Since the previously mentioned Duero River terrace named TD-7 has been dated by Alfredo Pérez-González (op.cit.) to the beginning of the Middle Pleistocene, meaning the river terraces of Trabancos River are younger than the "Superficie de Alaejos", it appears plausible that this postdates the creation of Trabancos valley: the proposed date could, thus, be halfway through the Middle Pleistocene or later.