The Rotzo Formation is a geological formation in Italy, dating to roughly between 189 and 183 million years ago and covering the Pliensbachian stage of the Jurassic Period in the Mesozoic Era. Has been traditionally classified as a Sinemurian-Pliensbachian Formation, but a large and detailed dataset of isotopic 13C and 87Sr/86Sr data, estimated the Rotzo Formation to span only over the whole Pliensbachian. The Rotzo Formation represented the , being located over the Trento Platform and surrounded by the (marginal calcarenitic bodies), the (condensed deposits and emerged lands), the and (open marine), and finally towards the south, deep water deposits of the Adriatic Basin.