EARLY EVOLUTION OF PRIMITIVE ANGIOSPERMS IN CRETACEOUS

白垩纪原始被子植物的早期演化

基本信息

批准号：
12640683
负责人：
TAKAHASHI Masamichi
金额：
$ 1.92万
依托单位：
NIIGATA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640683/
关键词：
CRETACEOUS ANGIOSPERMS EARLY EVOLUTION MESOFOSSILS PALAEOBOTANY CORNACEAE FUTABA GROUPS FLOWER FOSSILS クスノキ科

项目摘要

A preliminary description is provided of a new assemblage of plant fossils(the Kamikitaba mesofossil flora) from the Asamigawa Member of the Ashizawa Formation(lower Coniacian, Upper Cretaceous) exposed in Kamikitaba, Fukushima Prefecture, northeastern Honshu, Japan. The fossils are small, three-dimensional and charcoalified or lignitized(mesofossils) and yield exquisite structural details when studied with scanning electron microscopy. The Kamikitaba assemblage comprises the first record of this style of fossil plant preservation from the Cretaceous of eastern Asia. The flora complements and extends current knowledge of Cretaceous fossil plants from Japan and provides a basis for comparison with similar mesofossil assemblages from eastern North America and Europe. The fossil assemblage contains well-preserved angiosperm flowers, fruits, seeds, leaf fragments and wood, as well as shoots, leaves, pollen cones, cone scales and seeds of conifers. Extant taxa that can be recognized provisionally include : Lauraceae, Hamamelidaceae, Fagaceae, Cornales, Combretaceae, and probably Ericales, Magnoliaceae, Nymphaeales and Taxodiaceae. Leaf and rachis fragments of ferns, sporangia with in situ spores, and megaspores also document the presence of Selaginellaceae and Schizaeaceae.

初步描述了植物化石（Kamikitaba Mesopossil Flora）的新组合，该组合是在福岛州东北福基岛（Fukushima）福基岛（Fukushima）预处，日本东北部的福岛山岛（Kamikitaba）的Ashizawa组成员（下Coniacian，topper of cletaceous）。化石是小的，三维的，木制的或褐色的（介体），并在使用扫描电子显微镜研究时产生精美的结构细节。 Kamikitaba组合包括这种化石植物保存风格的第一个记录，来自东亚的白垩纪。植物区系补充并扩展了对日本白垩纪化石植物的当前知识，并为与北美东部和欧洲的类似介体组合进行了比较提供了基础。化石组合包含保存完好的被子植物花朵，水果，种子，叶片碎片和木材，以及芽，叶子，花粉锥，锥鳞和针叶树的种子。可以暂时识别的现有分类单元包括：月桂科，哈马梅利甲基科，fagaceae，cornales，combretaceae，以及可能的埃里克斯（Ericales），镁科，若虫科和分类犬科。蕨类植物的叶子和拉奇碎片，带有原位孢子的孢子囊以及巨型孢子也记录了Selaginellaceae和schizaeaceaee的存在。