Upon the set of geophysical methods (well-logs) it was mad the subdivision of Creta-ceous sediments till a sub-stage level within the Conjugation zone between EEP and Scythian plate as well as be-to-bed correlation in the area studied. The geological structure of the Cretaceous sediments for all tectoni-structural ele-ments of the EEP and Scythian platform in the area studied is detailed and their structure and litho-facies features are described. The genetic groups of sediments corresponded to different bathymetric zones from littoral with active hydrodynamics to rather deepwater ones of a marine basin are recognized. Four facies zones (one for early Cretaceous and three ones for late Cretaceous times) continuously changed each other in the basin. The obtained results have made the basis for new structural & facies zonation of the area. Four structural and facies regions, namely Scythian (for Early Cretaceous), Northern, Central, and Southern (Late Cretaceous) ones comprising 16 different structural & facies zones have been recognized. Restoration of geological evolution of the paleo-basin during Cretaceous period with-in the area studied is made. The peculiarities of the different types of Cretaceous rocks combination in the sedimentary sequence and their position in the section point out onto cyclicity character of their sedimentation. It is proved that the whole sequence of the Cre-taceous rocks is composed by five large transgressive-regressive cycles (stages): Oxfor-dian-Berriasian, Valanginian-Middle Aptian, Late Aptian-Early Cenomanian, Middle Cenomanian-Middle Santonian, and Late Santonian-Maastrichtian. Upon our view, those large transgressive-regressive cycles (stages) recognized by geo-historic criteria are corresponded to stratigraphic divisions of a higher rank than regio-stage/horizon (approved by the Stratigraphic Code of Ukraine) and upon their stratigraphic extent suit much better to series of the International Geological Time Scale. Upon our opinion, these are the highest taxonomic subdivision of the Cretaceous regional units in the area studied. Thus, local subdivisions are corresponded to series. It is proposed to con-sider a possibility to include such subdivisions into regional stratigraphic correlation charts and, by separation of the notions of a regio-stage and a horizon to reckon the former as regio-stages while the stages of the second order to reckon as horizons. For the first time it was recognized five regional stratigraphic subdivisions of Creta-ceous sedimentary sequence in the Ukrainian sector of the Conjugation zone between EEP and Scythian plate, namely: Yaylian (Oxfordian-Early Berriasian), Belogorian (Valangin-ian - Middle Aptian), Tarkhankutian (Late Aptian - Early Cenomanian), Odessian (Middle Cenomanian - Early Santonian), and Karkinitian (Late Santonian - Maastrichtian) ones, as well as 14 horizons: Goncharovkian (composing Yaylian regio-stage); Soldatovkian, Ozerianskinan, Kholmogorian, Novoselovkian (Belogorian regio-stage); Chernomorskian, Severokrymian, Dzhankoyian (Tarkhankutian regio-stage); Serebryanskian, Borisovkian and Semenovkian (Karkinitian regio-stage); Maksimovskian, Shtormovian and Shtylevian (Odessian regio-stage). Issuing from the obtained results it was recognized local stratigraphic units (suits): 19 suites are established in the Early Cretaceous sequence (12 from them are new ones) and two formations, and 38 suites in the Late Cretaceous sequence (37 are new ones) and two formations as well. It was built an original regional correlation chart of the Cretaceous sedimentary suc-cession for the area studied. In the Cretaceous sequence it was recognized and character-ized five petroleum-bearing and petroleum-prone rock complexes (formations) based on conducted geological restorations and litho-facies studies which are corresponded to the above regional stages: Yaylian, Belogorian, Tarkhankutian, Karkinitian and Odessian. The petroleum potential of those rock complexes within the area under investigation is evaluated applying litho-stratigraphic approaches. The most prospective zones are de-lineated and top priority exploration structures from those already mapped and prepared for deep drilling in the Cretaceous sequence are recognized for further hydrocarbon explo-ration stages.
