The oldest geological materials are formed by the Triassic outcrops which, from Altea, coming to the area of Finestrat and Orxeta.
Morphologically consists of limestone and marly Aptense the Lower Cretaceous period, which is the arc of ridges prebéticas, just lack of fertile soil, with the exception of the Quaternary deposits in the bottom of the valleys, this is a limiting factor for the presence the vegetation.
These ridges of South Prebético Valenciano cause a double-checked because of their particular location in this area, rushing toward the Mediterranean coast.