The little village lies on a plateau, at about 500 metres above sea level, in an area rich with scenic beauty and archaeological remains. Traces of the presence of man in the area, date back to the Neolithic age, but the first documented evidence recording Cossoine is from the XI century. The church of Santa Maria Iscalas and the nearby village of Santa Maria di Curin are cited in the "Annales Camaldulenses", and the little village of "Consedin" or "Cossein" was born from the merger of these and other nearby villages. The origins of its name are not very certain: some scholars suggest that it derives from the Logudorese word "cossu" which means 'hollow' or 'wash-basin', while for others it is connected with the personal name of "cossu" deriving from "corpus" and originating from Corsica.
During the Middle Ages, the village was part of the 'curatoria' of Cabudabbas in the 'Giudicato' of Logudoro. The village was intensely populated until the beginning of the XVI century, but a number of outbreaks of the plague brought about a substantial population decrease. The historic centre dating back to the sixteenth century is characterised by seventeenth- eighteenth century buildings. The late-Gothic Church of Santa Chiara is of great interest. There are numerous traces of human settlement here from the Neolithic Age onwards: among these we should mention the number of "domus de janas'(chamber tombs) which have come to light. The 'Corruoe' site is of certain interest and a number of remains have been found here of an important Nuraghic village and a Roman villa. Another reason for visiting the village is to see the numerous natural caves found here, hollowed into the calcareous and volcanic rocks. for example the 'Sa Ucca 'e su Peltusu' cave, considered one of the biggest in the province of Sassari. Inside the cave, it is possible to admire not only the important phenomena of carsic erosion but also an underground stream and a deposit of fossilised oysters dating back to the Miocene period.
Then there are the extremely interesting caves of 'Suiles' and 'Sa Ucca 'e Mammuscone', hollowed into the upper part of first the volcanic and then the calcareous rocks and reaching a depth of 63 m. Another must is Mount Traessu. this massif is formed from basalt rocks and abounds with gorges, precipices and caves. There are also plenty of examples of cork and durmast trees. The Feast of San Sebastiano takes place in May and is renowned for its traditional "ardia". In August, it is the turn of the Feast in honour of Santa Chiara, the Patron Saint of the village. Finally the Feast of Santa Maria Iscalas takes place between the end of August and the beginning of September.