The deposits with fossil bones that can be visited in Arén called Blasi. The tour starts in front of the Museum of Dinosaurs, which are arrows indicating the direction to follow.

The trail is well marked with arrows and explanatory panels and runs through the ravine in L'Aiguafreda forests of oaks and holm oaks and among the loosening of the rock and sand formations Tremp (on sandstone and white and red clays versicolor). There are 12 stops in explaining various aspects of flora and fauna, the geology and landscape. The last stops are in front of the site of Blasi exact replicas of the bones in the places where they were found and lots of information about dinosaurs Arena. The full path of return may involve two to five hours, although it is advisable to invest at least one morning or afternoon, paying attention to the heat in summer and wearing proper footwear.