The wider area of the island Dugi otok around the Brbišćica bay is built of carbonate rocks formed hundred million years ago. The rocks along the bay are the finding site of many tiny fossils invisible to the naked eye and also lots of fossils of large organisms. Beside the usual fossilized shells of that time, an extremely valuable fossil marine reptile was found. Today the limestone in this area is more karstified and we find interesting karst forms: sea flooded caves, passages and pits. Because of the geomorfological diversity, divers are very interested in the bay Brbiscica. That is the reason why several diving schools in Dugi otok provide diving lessons on this location.
