Paleoecological and genetic characteristics of the organogenic structure of Mount Bezymyannaya (Southern Primorye)

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Abstract

For the first time, a lithological-paleoecological description of the organogenic construction of Mount Bezymyannaya 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 process of reef formation were determined. Based on the data obtained, three genetic types of limestones composing the organogenic structure were established: biogenic, biochemogenic and mechanogenic. Studies of the taxonomic composition and structure of communities allowed us to identify two stages in the development of organogenic construction corresponding to facies: 1) biostromes and 2) biogerms. A description of each stage of development is given. The findings of some sphinctozoan species new to this locality are reported: Belyaevaspongia insolita Senowbari-Daryan et Ingavat Helmcke, 1994; Colospongia lenis Malysheva, 2018 and Rhabdactinia columnaria Yabe et Sugiyama, 1934.

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About the authors

Ekaterina N. Malysheva

Far East Geological Institute, FEB RAS

Author for correspondence.
Email: rumbum@yandex.ru
ORCID iD: 0000-0002-6292-4757

Junior Researcher

Russian Federation, Vladivostok

References

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2. Fig. 1. Bezymyannaya Mountain: a - location scheme, b - view from the road

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3. Fig. 2. Genetic types of limestones of Bezymyannaya. Biogenic limestones: a - crinoid, b - sphinctozoite-sponge-crinoid, c - microbial-mossy-algal-algae; biochemogenic: d - algal-sponge-mossy, e - pelitomorphic; mechanogenic: f - organogenic-clastic limestone

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4. Fig. 3. Facies of Bezymyannaya: a - facies of biostrom, b - percentage of organisms in facies of biostrom, c - facies of bioherm, d - percentage of organisms in facies of bioherm

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5. Fig. 4. Sphinctozoa species new to Bezymyannaya: a - Belyaevaspongia insolita Senowbari-Daryan et Ingavat Helmcke, 1994; b - Colospongia lenis Malysheva, 2018; c - Rhabdactinia columnaria Yabe et Sugiyama, 1934

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