Cretaceous in Sakhalin and Cretaceous events in North Pacific

结合1997年和1998年的matnetostratigraphy和碳同位素stratigraphy调查，对俄罗斯远东萨哈林岛南部白垩系进行了生物地层学研究。为了建立更精确的白垩纪生物年代地层学，并解释北太平洋地区白垩纪生物和物理演化的各个方面，在奈巴河和马卡洛夫河沿岸，我们获得了北太平洋地区最可靠的圣东期、坎帕期和大部分马斯特里克的生物年代方案。该研究结果与艾河段白垩统中上段的生物地层对比，为菊石、虫壳类等海洋无脊椎动物的生物地层对比，以及对海洋动物区系时空特征的认识提供了良好的依据。研究了陆地有机碳的碳同位素变化，以显示全球公认的事件，并证明其作为地层工具的效用。白垩系砂岩的矿物组成和独居石年龄与北海道中部相同。虽然没有定论，但我们收集了奈巴河段海洋K/T边界的额外数据。“大年”部分仍需进一步研究，仅其最上面部分具有第三纪植物巨化石特征。

The Cretaceous System in the southern part of Sakhalin, Russian Far East, was studied biostratigraphically, combined with matnetostratigraphic and carbon isotope stratigraphic surveys in 1997 and 1998. to establish a more precise bic- and chronostratigraphy for the Cretaceous System and to interpretate various aspects in biotic and physical evolution during the Cretaceous in the North Pacific regions, At the sections along the Naiba and Makarov rivers, we obtained the most reliable bio- and chronosratigraphic scheme in the North Pacific regions for the Santonian, Campanian and most part of Maastrichtian. The results, together with the middle and upper parts of the Cretaceous along the Ai River section, provide a sound basis for the biostratigraphic correlation based on marine invertebrates such as ammonites and inoceramids, and for our understandings of marine faunal characteristics in time and space. Carbon isotope changes from terrestrial organic carbon were examined to show globally recognized events and o prove its utility as a stratigraphic tool. Mineral composition and monazite ages in the Cretaceous sandstones indicate the same provenance as those in central Hokkaido. Although not conclusive, we collected additional data on the marine K/T boundary at the Naiba River section. The "Danian" part is still needed further investigations, and only its uppermost part is characterized by plant megafossils of Tertiary type.