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Early Evolution of Primitive Angiosperms in Cretaceous

Research Project

Project/Area Number 15570076
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Biodiversity/Systematics
Research InstitutionNiigata University

Principal Investigator

TAKAHASHI Masamichi  Niigata University, Institute of Science and Technology, Professor, 自然科学系, 教授 (00154865)

Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2005: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2004: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2003: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsAngiosperms / Early Evolution / Mesofossils / Cretaceous / micro CT / Futaba Group / 植物化石 / 上北迫植物化石群 / 小型化石 / ヤマグルマ科 / 古植物学 / ミズキ科 / 花化石
Research Abstract

Over the last 20 years, many Cretaceous mesofossil floras have been discovered in Europe, eastern North America and central America. Studies of the mesogossils in these assemblages have yielded dramatic progress in our understanding of pattens of systematic differentiation during the Cretaceous history of angiosperms.
In this study, I would like to present a new Cretaceous mesofossil flora from northeastern Asia and the Pacific Rim. The mesofossils were isolated from bulk sediment samples collected from an outocrop of the Futaba Group exposed in Fukushima Prefecture in northeastern Japan. The sediments of the Futaba Group are thought to range in age from early Coniacian to late Santonian, and well dated by marine invertebrate fossils that also occur in some facies of the Futaba Group.
The platn-bearing sediments are from the Asamigawa Member, the lowermost within the Futaba Group, and are dated as early Coniacian, about 89 million years before present, based on marine fossils in the over … More lying Obisagawa Member. The sedeiments of the Asamigawa Member are interpreted as an alluvial fan deposit comprising poorly-sorted sand stones and siltstones.
The fossil assemblage, which I call "Kamikitaba assemblage" after the name of the sampling site, contains well preserved megaspores, sporangia, conifer shoots, cone scales, and angiosperm flowers, fruits and seeds. Among the ferns, the family Schizeaceae is well represented, and the conifers include a variety of presumed Taxoideae and perhaps other familes.
In summary, the Kamikitaba assemblage includes well-preserved fossil flower, fruits and seed of early angiosperms. I concluded from the evidence of mesofossils, that the early Coniacian vegetation in the environments represented by the Kamikitaba assemblage, was probably dominated, in terms of abundance, by both conifers and angiosperms, with angiosperms probably more diverse in terms of species. Extant taxa that can be recognized provisionally include: Lauraceae, Hamamelidaceae, Fagaceae, Cornales, Combretaceae, and probably Ercales, Magnoliaceae and Nymphaeales. Less

Report

(4 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (6 results)

All 2007 2006 2005

All Journal Article (4 results) Book (2 results)

  • [Journal Article] Fossil seeds of Nymphaeales from the Tamayama Formation (Futaba Group), Late Cretaceous (Early Santonian) of Northeastern Honshu, Japan2007

    • Author(s)
      Takahashi, Friis, Crane
    • Journal Title

      International Journal of Plant Sciences 168

      Pages: 341-350

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Crane : Fossil seeds of Nymphaeales from the Tamayama Formation (Futaba Group), Late Cretaceous (Early Santonian) of Northeastern Honshu, Japan2007

    • Author(s)
      Takahashi, Masamichi, Else marie Friis, Peter R.
    • Journal Title

      International Journal of Plant Sciences 168

      Pages: 341-350

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 白亜紀~古第3紀の陸上植物の変遷過程~白亜紀に多様化した被子植物群と古第3紀の植物相の地理的分布2005

    • Author(s)
      高橋 正道
    • Journal Title

      石油技術協会会誌 70

      Pages: 37-46

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 白亜紀〜古第三紀の陸上植物の変遷過程2005

    • Author(s)
      高橋 正道
    • Journal Title

      石油技術協会誌 (印刷中)

    • Related Report
      2004 Annual Research Report
  • [Book] 被子植物の起源と初期進化2006

    • Author(s)
      高橋 正道
    • Total Pages
      506
    • Publisher
      北海道大学出版会
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Book] Origin and Early Evolution of Angiopserms in Cretaceous (in Japanese)2006

    • Author(s)
      Takahashi Masamichi
    • Total Pages
      506
    • Publisher
      Hokkaido Univ Press
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary

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Published: 2003-04-01   Modified: 2016-04-21  

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