Early Evolution of Primitive Angiosperms in Cretaceous

白垩纪原始被子植物的早期演化

• 批准号: 09640827
• 负责人: TAKAHASHI Masamichi
• 金额: $ 1.86万
• 依托单位: KAGAWA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640827/
• 关键词: Ashizawa Formation; Futaba Group-; Cretaceous-; fossil flowers-; fossil plants-; Japan-; Kamikitaba assemblage; 双葉層群; 炭化化石

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.

对日本本州东北部福岛县上北田出露的芦泽组浅川段（下科尼亚统，上白垩统）的新植物化石组合（上北田中化石植物群）进行了初步描述。这些化石体积小、三维、木炭化或木质化（中化石），用扫描电子显微镜研究时会产生精美的结构细节。上北叶组合是东亚白垩纪这种植物化石保存方式的第一个记录。该植物群补充并扩展了日本白垩纪植物化石的现有知识，并为与北美东部和欧洲的类似中化石组合进行比较提供了基础。该化石组合包含保存完好的被子植物花朵、果实、种子、叶子碎片和木材，以及针叶树的枝条、叶子、花粉球、球果鳞片和种子。可以暂时识别的现存类群包括：樟科、金缕梅科、壳斗科、玉米目、君子科，可能还有杜鹃目、木兰科、睡莲目和杉科。蕨类植物的叶子和轴碎片、带有原位孢子的孢子囊和大孢子也记录了卷柏科和裂殖科的存在。

项目成果

Takahashi, M.Peter, R.Crane, H.Ando: "Fossil flowers and associated plant fossils from the Kamikitaba locality (Ashizawa Formation, lower Coniacian, Upper Cretaceous) of Northeast Japan" Journal of Plant Research. (in press). (1999)

Takahashi, M.Peter, R.Crane, H.Ando：“日本东北部上北田地区（芦泽组，下科尼亚阶，上白垩纪）的花化石和相关植物化石”《植物研究杂志》。

Takahashi,M.,Peter R.Crane and H.Ando.: "Fossil flowers and associated plant fossils from the KamiKitaba locality (Ashizawa Formation,lower Coniacian,Upper Cretaceous) of Northeast Japan." Jour.Plant Res.

Takahashi,M.、Peter R.Crane 和 H.Ando.：“来自日本东北部 KamiKitaba 地区（芦泽组、下科尼亚阶、上白垩纪）的花化石和相关植物化石。”

Takahashi, M.,Peter R.Crane and H.Ando.: "Fossil flowers and associated plant fossils from the Kamikitaba locality(Ashizawa Formation, lower Coniacian, Upper Cretaceous)of Northeast Japan." Jour.Plant Res.

Takahashi, M.、Peter R.Crane 和 H.Ando.：“来自日本东北部上北田地区（芦泽组，下科尼亚阶，上白垩纪）的化石花和相关植物化石。”

Takahashi, M.Peter, R.Crane, H.Ando: "Esgueiria futabensis sp.nov., anew angiosperm flower from the Upper Cretaceous (lower Coniacian) of northeastern Honshu, Japan." Paleontological Research. (in press). (1999)

Takahashi, M.Peter, R.Crane, H.Ando：“Esgueiria futabensis sp.nov.，一种来自日本本州东北部白垩纪（下科尼亚阶）的新被子植物花。”

Takahashi,M.,P.R.Crane and H.Ando.: "Esgueiria futabaensis sp.nov.; a new angiosperm flower from the Upper.Cretaceous (lower Coniacian) of northeastern Honshu,Japan." Paleontological Research.

Takahashi,M.,P.R.Crane 和 H.Ando.：“Esgueiria futabaensis sp.nov.；一种来自日本本州东北部白垩纪（下科尼亚阶）的新被子植物花。”