Rock type: carbonate sedimentary

Age: between 387 and 355 million years. Devonian period (Upper Devonian, Facies Griotte Compte).

Characteristics: composed of calcium carbonate nodules, with fossil remains of goniatite shells, surrounded by maroon-colored manganese and iron minerals which gives the rock its high density.

Formation environment: deep marine areas.

Uses: building materials and ornamental rock.

Origin of the block: Espaén, la Guàrdia d’Ares, Les Valls d’Aguilar (Alt Urgell).