Sant'Antioco di Bisarcio (Ozieri): la cattedrale romanica e i materiali costruttivi

The church of Sant'Antioco of Bisarcio (Ozieri) was cathedral of the homonym diocese from the XI to the XVI century. It represents one of the most preserved and meaningful monuments of the Romanesque architecture in Sardinia. Among the documentary sources it dresses character of novelty the epigraph in the apse with the year 1164 and bishop Giovanni Thelle's name. In the history of the studies we distinguish three constructive phases, that introduce separate characters both from the formal point of view and in comparison to the constructive materials (volcanic rocks of various type) and to the processes of alteration and degrade of some rocks.