1994 Fiscal Year Final Research Report Summary
CRETACEOUS IN SAKHALIN AND CRETACEOUS EVENTS IN N.PACIFIC
| Project/Area Number |
05041068
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Field Research |
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| Research Institution | NATIONAL SCIENCE MUSEUM |
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Principal Investigator |
KASE Tomoki DEPARTMENT OF GEOLOGY,NATIONAL SCIENCE MUSEUM, 地学研究部, 室長 (20124183)
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| Co-Investigator(Kenkyū-buntansha) |
KODAMA Kazuto FACULTY OF SCIENCE,KOCHI UNIVERSITY, 理学部, 助教授 (00153560)
SHIGETA Yasunari DEPARTMENT OF GEOLOGY,NATIONAL SCIENCE MUSEUM, 地学研究部, 研究員 (30270408)
OKAMOTO Takashi FACULTY OF SCIENCE,EHIME UNIVERSITY, 理学部, 講師 (30201990)
FUTAKAMI Masao GENERAL EDUCATION,KAWAMURA GAKUEN WOMAN'S UNIVERSITY, 一般教育, 助教授 (50211529)
MAEDA Haruyoshi FACULTY OF SCIENCE,KYOTO UNIVERSITY, 理学部, 助手 (10181588)
UEMURA Kazuhiko DEPARTMENT OF GEOLOGY,NATIONAL SCIENCE MUSEUM, 地学研究部, 室長 (50000138)
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| Project Period (FY) |
1993 – 1994
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| Keywords | Paleontology / Paleomagnetics / Cretaceous / Ammonite / K-T boundary / C-T boundary / Sakhalin / Biostratigraphy |
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| Research Abstract |
The Cretaceous System in the Naiba, Sinegorsk, Ai, Pugachevo and Makarov area of southern Sakhalin, Russia has been investigated from a viewpoint of paleontology, biostratigraphy and paleomagnetics in connection with the Cenomanian-Turonian marine anoxic event and the Cretaceous terminal mass extinction event.
1. The Cretaceous in the Naiba area ranges continuously from the Albian to Maestrichtian in age, and is devided into four stratigraphic units. Well-stratiphied, fossil-less, dark-colored mudstone of the upper part of the Ai Formation and the lower half of the Naiba Formation (Albian to Turonian age) appears to have deposited under marine anoxic events. Upper part of the Bykov Formation includes ammonites and inoceramids abundantly and can be assinged to Santonian age. Krasnoyarka Formation ranges from Campanian to Maestrichtian, within which three characteristic ammonite assemblages have been recognized. The Canadoceras multicostatum assemblage (upper Campanian) and the Zelandites
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varuna assemblage (Maestrichtian) ares in common with those found in the contemporaneous strata of the Soya area, Wakkanai and the Awaji area, respectively. There is some possibility to exist Danian strata in the upper part (200 to 300 meters thick) of the Krasnoyarka Formation in the Naiba and Sinegorsk areas, but we have yet get any reliable fossil evidence. If this is so, however, there is no characteristic geologic phenomena in the Naiba area that suggest the Cretaceous terminal event.
2. The Cretaceous succession in the Makarov area ranges from Santonian to Maestrichtian in age. We have recognized four fossil assemblages (Anapachydiscus sutneri Ass. , A.naumani-Inoceramus orientale Ass. , Eupachydiscus haradai-I.schmidti Ass. , Canadoceras kossmati Ass.) in the Bykov Formation and three fossil assemblages (C.multicostatum -Saghalinites teshioensis Ass. , Gaudryceras tombetsense-Pseudophyllites indra-Inoceramus hetonaianus Ass. , Pachydiscus cf. flexuosus-Gaudryceras sp. Ass.)in the Krasnoyarka Formation. We can not detect the Cretaceous-Tertiary boundary in this area. Less
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Research Products
(10 results)
