| Project/Area Number |
10640457
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Stratigraphy/Paleontology
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| Research Institution | INSTITUTE OF NATURAL HISTORY |
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Principal Investigator |
OHANA Tamiko INSTITUTE OF NATURAL HISTORY, INVESTIGATOR, その他の部局, 研究員 (60231205)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1999: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1998: ¥900,000 (Direct Cost: ¥900,000)
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| Keywords | Bennetticarpus / Bennettitales / Hokkaido (Japan) / Late Cretaceous / Upper Yezo Group / 球果目 / Karaocarpon / ベネチテス目の分布 / Cycadeoidea / 恐竜類の分布とその相関 / 上部白亜系 |
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| Research Abstract |
Recently many plant-taxa have been described from the marine Upper Yezo Group (Coniacian-Santonian). These plant fossils are preserved as permineralized debris in calcareous nodules together with various marine animals. A single bennettitalean specimen was collected from the Upper Yezo Group. It consists of a receptacle, with numerous fertile (seminiferous) and sterile (interseminal) scales. Although the specimen is fragmented, its anatomical features are well preserved. This study provides a description of a new reproductive organ belonging to Bennettitales. As its affinity to Williamsoniaceae or Cycadeoidaceae and their allies is uncertain, we provisionally place our specimen in the form-genus Bennetticarpus and describe B. yezoites sp. nov.
Comparison of Bennetticarpus yezoites with known bennettitalean taxa in other regions is given briefly.
The present specimen is in association with various conifers, mainly with Taxodiaceae.
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