Grotte e abissi nell'unità geologica Montsec de Rúbies

The Montsec de Rúbies is an eastern sector of the Montsec, in the Prepirineu, a limestone wall with notable gorges and cavities. The catalogue records 46 cavities: 22 pits and 24 caves, with a total passage of 4,822 m and a maximum depth of 107 m. Limestone predominates (44 cavities), with 2 of conglomerate.

Among the most notable cavities is the Forat de l'Or, an important spring of 2,213 m of passage in the Terradets gorge (Camarasa), with 1,400 m submerged in load and a height difference of 93.5 m. The Cova dels Muricecs, of 390 m, is in the Terradets gorge (Llimiana), with the sala dels Muricecs and the Laberint. The Cova Negra de Mata-solana, of 250 m, is in the Montsec de Rúbies, Llimiana, and was explored between 11 and 15 August 1966 and made known by the GIE del CE Gràcia.

The Querant Petit de Paús reaches 107 m of height difference in Vilanova de Meià, and the Querant Gran de Paús, -83 m, has an entrance of 5 x 2 metres, shafts and inclined galleries; it was explored from 1963 and the survey was revised in 1980 by the GEFOMA. The Forat dels Diners, of 29 m of height difference and 182 m of passage in Gavet de la Conca, has a hall of 36x14x13 m, an artificial shaft of 3 m of depth and 6 m of width, and an upper gallery of 40 m; it was documented from 1891 and explored speleologically in 1966.