This paper reports new data on geological structure, palynostratigraphy, and paleomagnetism obtained from key BH-9 as well as from BH-2, BH-6, and BH-13 drilled in the south of the Novosibirsk Region. The rock lithology has been described to follow the stratigraphic sequence. The question on recognition of the Upper Cretaceous is discussed. Zonal complexes of dinocysts, spores, and pollen are characterized. The marine deposits date from the Paleocene and Miocene, and the continental ones, from the Oligocene and Miocene. The data on microphytofossils confirm the recurrent character of development of the Tavda sea basin in the late Middle-Late Eocene. Cysts of dinoflagellates of the genus Pseudokomewuia were established for the first time in the Upper Oligocene sediments (Turtas lake-sea), which suggested a connection of the Turtas basin with southern seas through the Turgai strait at the beginning of Zhuravka time. The range of occurrence of dinocysts is bordered south of 55° N. Until recently, dinocysts of the genus Pseudokomewuia were established only in China and North America, and now they are found in West Siberia as well. These findings are of great interest for solving problems of paleogeography and paleoecology.

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