A section of Berriasian deposits from the River Belbek area (Southwestern Crimea) containing coralalgal bioherms is described. A detailed lithological and palaeontological description of one of these bioherms is given. Lithological features of Berriasian carbonate rocks are discussed, microfacies analysis of these rocks with there palaeontological remains are carried out. The history of the Berriasian development of the territory will be reconstructed.