Abstract
A lithological-paleoecological description of the organogenic structure of Mountain Sestra is given. A macro- and microscopic study of the fauna composing the structure was carried out, its percentage content in limestones and the role of each group of organisms in the reef formation process were determined. Based on the data obtained, six genetic types of limestones were identified: biohermic, biomorphic, detrital, biohemogenic, clastic and granular. Studies of the taxonomic composition and the structure of communities allowed us to identify three distinct stages in the development of organogenic structure corresponding to facies: 1) banks, 2) biostromes and 3) bioherms. A detailed description of each stage of development is given. Based on the description, assumptions are made about the initial stage of reef formation. The findings of some species of sphinctozoa new to this locality are reported: Colospongia globosa Belyaeva, 1991; Amblysiphonella regularis Zhang, 1983 and Discosiphonella squamilis Belyaeva, 1991.
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