Microstructural features of Lower Permian ooid limestones (South Timan)

Based on electron microscopic studies of ooid limestones from the Lower Permian section of the Southern Timan, morphological features have been identified that indicate the formation of carbonates as a result of organomineralization processes caused by the presence and activity of microorganisms (microbial metabolism) and the influence of mucous substances acting as a matrix for crystal nucleation and growth. As a result of the research, mineralized bodies of organisms, biogenic microstructures, bacterial biofilms and filaments preserved in various forms have been identified. The obtained novel data testify to organomineralization at the formation of fossil ooids.