Abstract
A lithologic and biostratigraphic study of the Kiev and Obukhov regional stages in the junction zone of the Dnieper-Donets Depression, Voronezh anteclise and northwest margin of the Donets Basin has confirmed two-component structure of the Kiev regional stage, with chertification being typical of the upper part of the Kiev and lower part of the Obukhov regional stages. Foraminiferal layers with Acarinina kiewensis and layers with Pseudoclavulina subbotinae-Robulus dimorphus, nannoplankton Zone NP16, dinocyst Zone DP9 and diatom layers with Stictodiscus kossutii have been recognized in the lower carbonaceous part of Kiev deposits. Layers with agglutinated foraminifers, dinocyst Zone DP10 and the diatom Cristodiscus succinctus Zone have been recognized in the non-carbonate part of Kiev deposits. Diatomes of the Plagiogramma paleоgena Zone have been identified in the lower part of Obukhov deposits. According to the identified microfossil assemblages, the Kiev and Obukhov regional stages in the region under study are dated to be Bartonian and Priabonian, respectively. This study reveals difficulties connected with the recognition of standard oceanic zones in epicontinental basins and points to the necessity of creating regional biostratigraphic schemes.
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