Grotte e abissi nell'unità geologica Travertins de Banyoles

The Travertins de Banyoles are a unit of the Serralada Transversal formed by travertine terrain around the Estany de Banyoles, where carbonated water has formed tufa caves. It comprises 20 cavities: 17 caves and 3 pits, with a total passage of 829 m and a maximum depth of 60 m. The lithologies represented are Travertine (16), Sandstone (2), Conglomerate (1) and Limestone (1).

The cavity with the greatest passage is les Estunes, with 210 m, known since time immemorial and surveyed on 17 June 1981. It is followed by the Avenc del Tall, of 168 m, and the Cova de Mariver de Martís, of 110 m, discovered on 19 September 1952 by J.M. Verdura and two youths. Other notable cavities are the Cova de les Encantades de Martís, of 76 m, and the Cova dels Encantats, of 69 m.

As for depth, the Avenc del Tall reaches 60 m; the Cova de les Encantades de Martís, 21 m; the Cova de l'Arbreda and the Cova dels Encantats, 11 m; and the Cova de Mariver de Martís, 10 m.