MIDDLE MIOCENE FOSSIL REEFAL STRUCTURE MEDOBORYTOUTRAS: ITS STRUCTURE, STAGES OF DEVELOPMENT AND SIGNIFICANCE IN THE FORMATION OF BUHLIV BEDS (NEOGEN, MIOCENE) PODILLYA (WESTERN UKRAINE)
Keywords:
reefs, Medobory Hills, Toutras, Buhliv beds, Neogene, Miocene, Badenian, Sarmatian, Podillya, Central Parathetys.Abstract
As a result of the analysis of the works of Ukrainian and Polish researchers, the structural morphological structure of the Middle Miocene fossil reef structure Medobory- Toutras within Ukraine was considered. This biogenoe structure is considered one of the largest reefal systems in Central Paratethys. Its laying and development played a significant role in the evolution of the entire Paratethys. It is not only a unique ecosystem that performs an important ecological function of the "light planet," but also a unique geomorpholic-geological structure, the analogues of which do not exist within the planet Earth, as well as a reservoir for accumulation and localization of various minerals – hydrocarbons, bauxite, iron ores, cobalt, nickel, etc. Given the almost 100-year history of research, it continues to attract the attention of scientists of different industries and can be the object of research in various scientific areas. It is also a unique complex monument to nature - an open-air museum. As a geomorpholic-geological structure – the reefs of Medobory-Toutras at the same time with the orogenic stage in the Carpathian folding system played an important role in the isolation of Central Paratethys from the adjacent Mediterranean/Indo-Pacific basins, their formation increased the sedimentary case of Neogene and became the source of formation of new geological bodies, in particular Buhliv beds. The study of microfossils from the Buhliv beds and the analysis of the structure of the reef system contributed to the determination of transverse, longitudinal and vertical zonation. So, in the cross direction allocation of facial-ecological zones – fore-reef, reef and back-reef facias is traced. In the longitudinal direction (from north-west to southeast) – rejuvenation and complications of the structure of reef construction. In the vertical direction (evolution in time) – identification of three stages of reef systems development, which differ in shape and type of biogenic bodies, change of organisms of reef-builders and organisms-inhabitants and age limits of laying and development of corresponding stages of reefs – from simple to more complex. The evolution of reef systems is directly related to the development of reef zones.
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