BUHLIV BEDS (NEOGENE, MIOCENE) OF THE PODILLYA (WESTERN UKRAINE): MICROPALEONTOLOGICAL, STRATIGRAPHICAL, FACIAL, PALEOECOLOGICAL, PALEOGEOGRAPHICAL DIAGNOSTIC CRITERIA AND FORMATION CONDITIONS

Comments are given on paleontology, stratigraphy, paleoecology, paleogeography and conditions of Buhliv beds formation (Neogen, Miocene) Podillya (Western Ukraine), which long caused discussions in ukrainian and polish scientific environments regarding stratigraphic position, volume, spatial distribution and up to the use of them as a stratigraphic unit in practical stratigraphy for the construction of geological models. On the basis of microfossils analysis (foraminifers, corals, molluscs, ostracods, bryozoans, polychaeta), ways to solve problem issues are given. Stratigraphic (contain mixed Badenian-Sarmatian complexes, the main signs of diagnosis of which are systematic composition – appearance of Sarmatian elements among the prevailing Badenian; degree of preservation of fossils – substitution (primary – carbonate, secondary – phosphatised, limonitized), thickness (thin-walled – transparent, translucent, brittle; thick-walled) and sculpture (ornamentation) walls of skeletons, size of taxa, traces of mechanical damage of remains); biostratigraphic (allocation eco/biozones); paleoecological (appearance/disappearance of skeletons elements, presence of two generation species); paleogeographycal (formation of lithoral in the brackish-water basin) and facial (are the advanced fore-reef facie reef of Medobory Hills) criteria for the identification of Buhliv beds are defined.mollusks, ostracoda, bryozo