Tremp Formation

The Tremp Formation is a geological layered sequence in the Pre-Pyrenees made up of sandstone, conglomerates, shale, marl, and limestone beds. These deposits reach thicknesses of 250 to 800 meters and reveal how sediments accumulated in this region over time.

This sequence formed between the Maastrichtian and Thanetian periods when tectonic forces created basins in the northeastern part of the Iberian Plate. During these geological epochs, sediments accumulated to build the layered system visible today.

Local museums in Tremp and Isona display fossils and bones discovered here, helping visitors understand the region's geological past. Walking through these exhibits gives a sense of what lived in this area millions of years ago.

Exposed rock layers are visible at several accessible locations across the formation, making it good for those interested in geology. Wear sturdy footwear and be ready for uneven terrain, as the exposed sections often sit on slopes and hillsides.

This place holds over 1,000 dinosaur bones and many fossil nesting sites from the Cretaceous period. These discoveries offer rare insights into how these animals lived and behaved before they disappeared.