Cretaceous in Sakhalin and Cretaceous events in North Pacific

1997年和1998年对俄罗斯远东萨哈林岛南部的白垩系进行了生物地层学研究，并结合地磁地层学和碳同位素地层学调查。为了建立北太平洋白垩系的生物年代地层学，解释白垩纪生物和物理演化的各个方面，在沿着Naiba河和Makarov河的剖面上，获得了北太平洋Santonian、Campanian和Maastrichtian大部分地区最可靠的生物年代地层学方案。结合艾河剖面白垩系沿着中上部的研究成果，为以菊石、无角虫等海洋无脊椎动物为基础的生物地层对比，以及对海洋动物群时空特征的认识提供了可靠的依据。研究了陆源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实用性。白垩纪砂岩中的矿物成分和独居石年龄表明与北海道中部的物质来源相同。虽然不是结论性的，我们收集了更多的数据，海洋K/T边界的Naiba河部分。“大年”部分尚需进一步研究，只有最上部有第三纪植物化石。

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.