ロシア共和国サハリン州クリリョン半島の上部自亜系層序

概要

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The Upper Cretaceous System in the Kura and Gorbusha areas of the Kril'on Peninsula, South Sakhalin was investigated stratigraphically and paleontologically by the first Japanese-Russian expedition after the Second World War. The Upper Cretaceous System of the Kril'on Peninsula is divided into two formations, the Bykov and Krasnoyarka formations in upward sequence. The former is composed of dark gray massive mudstone, and is correlated to the"Upper Yezo Group"in Hokkaido. The later consists mainly of sandstone and sandy mudstone, being correlated to the"Hakobuchi Group". Inoceramid bivalves, pachydiscid and gaudryceratid ammonites are abundant throughout the sequence, in which six inoceramid zones were recognized successively, i. e., Inoceramus amakusensis, Platyceramus japonicus, Sphenoceramus schmidti, Inoceramus balticus, Mytiloides shimanukii, and Inoceramus shikotanensis zones in ascending order. These zones suggest the Santonian to uppermost Campanian or lowest Maastrichtian stages.
国立科学博物館の論文
1999-06-22