Text written in Basque and translated automatically by Elia without any subsequent editing. SEE ORIGINAL

The Cretaceous Sea

All these rocks that trace the current coastline were underwater in the Upper Cretaceous. They were formed layer by layer, along with the solidification of the materials that fell down the slope from the continental shelf. We know this thanks to the rocks of the Flysh. The volcanic rocks of Meñakoz and Fruiz tell us the story of the underwater magma spills.