| Co-Investigator(Kenkyū-buntansha) |
OHSAWA Takeshi Chiba University, Faculty of Science, Assistant, 理学部, 助手 (50213682)
SAIKI Kenichi Chiba Prefectural Central Museum, Dept.of Botany.Researcher, 植物研究科, 学芸研究員 (40250055)
NISHIDA Harufumi International Budo Univerisity, Associate Professor, 体育学部, 助教授 (30164560)
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| Research Abstract |
In 1995, all members independently done their own field researches on the upper Cretaceous sediments looking for Angiosperm and Gymnosperm fossil woods, flowers, fruets, and seeds in Hokkaido. Those fossils were studied anatomically, and some of them were reported preliminary in meetings of the Botanical Society of Japan, Japanese Society of Plant Anatomists, Japanese Paleontological Society, and some others.
On late May in 1996, all research members researched the upper Cretaceous sediments at the area of upper streams of Obira River, northwest of Hokkaido, Japan. During the file research many fossil woods, some flowers and fruits of Angiosperms, many fossil woods and cones of Conifers, and some fruits of extinct Gymnosperms were collected. All of those fossils were studied anatomically. In this research two Angiosperm wood specimens were found from the Cenomanian (the earliest period in the late Cretaceous). This is the oldest record of Angiosperm wood in Japan. Wood structure of those woods were preliminary presented at annual meeting of Botanical Society of Japan (Tohoku District Meeting) on December, 1996.
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