Thesis for the degree of Doctor of Geological Sciences by specialty 04.00.01 "General and regional geology" (103 – Earth Sciences) – Institute of Geological Sciences of the National Academy of Sciences of Ukraine, Kyiv, 2020.
Detailed stratification and justification of the spatio-temporal regularities of the distribution of Mesozoic formation within Ukrainian segments of the Tethys and Boreal-Atlantic belt is based on the study of microfossils, in particular dinocysts, spore and pollen and other microfossils, on which the biostratigraphic schemes of Volyn-Podilska plate, Ukrainian Shield, Dnipro-Donets depression, Donbas, Crimea and biostratigraphic zonal standards are developed. For this purpose, a palynological substantiation for stratification of Middle Jurassic – Cretaceous deposits of Ukraine of different genesis was made. It was used bio-, lito-, stratigraphical, palynofacial methods; which allowed to determine the patterns of the event stratigraphy. According to the orthostratigraphical and others groups of fauna and flora, the dated boundary levels have been identified and the volumes of different stratigraphical units have been determined. To solve this problems, all identified groups of fauna and flora with appropriate resolution are analyzed. According to the results of the research, the regional and local Stratigraphical schemes of Middle Jurassic – Cretaceous sediments of Volyn-Podilska plate, the Ukrainian shield, the Donetsk folded structures, the Dnipro-Donets depression, Plain and Mountain Crimea, the North Azov deflection and the Azov valley have been supplemented (palynological data) and modernized. The regularities of the distribution of microfossils in coeval different facial strata are established.
The main groups important for stratigraphy are spores and pollen, megaspores and orthostratigraphic group – dinocysts. Associated groups are dispersed cuticles; tracheids; the remains of a structured tree; green algae (prasinophytes and botryococcus); acritarchs; the remains of fungi; microforaminifers; microspicules of sponge; the remains of parts a body of animal and insect; scolecodonts; bacteria; sclerenchyma and pseudomicrofossils.
For the first time megaspores in Aptian and Albian deposits of Ukraine were discovered. Their systematic composition is defined and two genera and two species belonging to the Lycopodiaceae are described.
For the first time dinocysts from Middle Jurassic – Cretaceous deposits of the Volyn-Podilska plate, Ukrainian shield, Dnipro-Donets basin, Donbas, Black Sea depression and Mountain Crimea have been studied, their systematic composition and stratigraphic distribution is determined. 13 stratigraphically important species of dinoscysts of the Middle Jurassic – Cretaceous deposits of Ukraine are monographically described. Five biosonal dinocysts schemes of the Jurassic and Cretaceous of the western (Volyn-Podilsky plate, the western slope of the Ukrainian shield), the central, eastern (northeastern part of the Ukrainian shield, Priazovsky array of Ukrainian shield, Dnipro-Donets basin, Donbas) and the southern (Mountain Crimea) regions of Ukraine were created. There are in total 20 dinocystal biostratigraphic units established: in the Middle and Upper Jurassic sediments there are three biostratons in the ranks of the layers with dinocysts and four biozones; in Cretaceous – five layers with dinocysts and eight biozones. Their correlation with the International Stratigraphic Scales has been carried out.
The age has been substantiated and the paleontological characteristic of 89 local stratum of Jurassic and Cretaceous has been by palynological data supplemented within all the main tectonic structures of Ukraine. As a result of research, 17 stratigraphic schemes (co-authored - 16, single - 1) of the deposits of the Middle, Upper Jurassic and Lower, Upper Cretaceous within Ukraine were modernized and improved.
The scheme of biostratigraphical correlation of marine and continental deposits in the range from Aalenian to Maastrichtian within the limits of Ukraine by microfossils is created. A regional stratigraphical scheme of the continental deposits of the Middle, Upper Jurassic and Lower Cretaceous of Ukraine has been developed.
The character of the development of terrestrial and marine biota on the border of the Jurassic and Cretaceous within territory of Ukraine based on the results of the study of microfossils is determined.
An atlas of microfossils from the Middle-Upper Jurassic to Cretaceous of Ukraine, consisting of 160 tables, has been created. The photocatalog of the investigated basic and typical sections of Jurassic and Cretaceous from all tectonic structures of Ukraine is made.
Keywords: stratigraphy, correlation, palynological studies, microfossils, Jurassic and Cretaceous sediments, geological structure, Ukraine.
