The conglomerate rock that borders the mountain ranges of the region gives rise to distinctive pinnacles that are very characteristic of the area between the pre-Pyrenean hills and the Ebro Valley; known locally as “mallos.” They are impressive formations with sheer, vertical walls and rounded peaks that rise to great heights. They were formed by the intervention of conglomerate masses of great size and power that had few bedding joints and a network of regularly spaced orthogonal fractures.

Signage: Pacos de Morrano Route