The article contains a detailed description of twelve lithogenetic types of rocks identified in the composition of the paragenetic association of the Ostrov Berkha reef mass facies: back-reef lagoon, reef flat, reef core, fore reef slope (buttress), fore reef and pinnacles. The article provides information on the structure and texture, mineralogical-petrographic and chemical fea-tures of the reef composition and surrounding sediments. The analysis of the structure of facies zones and features of their lateral changes allowed creating a model of the reef mass structure.
