Abstract
Lithostratigraphic units (formation, strata, and beds) and regional stages of the Oligocene-lower Miocene succession of southern Ukraine are described based on the results of comprehensive lithological and paleontological data analysis. The historical perspective on the stratigraphical investigations of the Maikop Group in the Crimean and Kerch Peninsulas and their equivalents in the broader Peri-Black Sea Region were also integrated in this overview. Moreover, a correlation was established between the locally defined regional stages and specific stratigraphic horizons of southern Ukraine, the global Oligocene and Miocene stages (defined by the International Stratigraphic Chart), and the stages of the Eastern Paratethys. The Planorbellian regional stage (early Rupelian) includes the Borysfen, Planorbella, Indol, and Eastern-Kerch Formations and Diurmen Beds. The Molochnian regional stage (late Rupelian) includes the Molochna and Azamat Formations and the Kop-Takil Strata. The Kerleutian regional stage (latest Rupelian-Chattian) includes the Kerleut, Sirohozy, Askaniia, and Hornostaivka Formations and the Chorelek and Clay Stratum. The Bathysiphonian regional horizon (Aquitanian-Burdigalian) includes the Arabatska, Alahol, Chornobaivka, and Mayachka Formations and the Karha Beds. This horizon is also considered as age-equivalent to the Caucasian, Sakaraulian, and Kotsakhurian regional stages of the lower Miocene in the Eastern Paratethys. The Oligocene-early Miocene age of all these lithostratigraphic units belonging to the megaregional Maikop Group is substantiated by paleontological data. This work represents the latest stratigraphic model of Oligocene-lower Miocene deposits in southern Ukraine as a part of the Eastern Paratethys Basin.
Highlights
The Oligocene-lower Miocene deposits are widespread on the mainland of southern Ukraine and represented by the Maikop Group succession on the Crimean and Kerch Peninsulas and its age-equivalent rocks in the northern Peri-Black Sea Region
In the following subsections we briefly summarize the main characteristics of the Maikop Group in our study area
In this paper we offer our view of the correlation scheme of the regional stages defined in southern Ukraine with those of southern Russia, mostly based on biostratigraphic data
Summary
1. Introduction The Oligocene-lower Miocene deposits are widespread on the mainland of southern Ukraine and represented by the Maikop Group succession on the Crimean and Kerch Peninsulas and its age-equivalent rocks in the northern Peri-Black Sea Region. The Lower Member in the south of the northern Peri-Black Sea Region comprises dark-gray, greenish-gray clays, noncalcareous and sometimes silty, which are similar to the clays of the Planorbella Formation of the Crimean Plain.
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