Origin and early evolution of Angiosperms in the late Cretaceous of Japan

1995年，所有成员都独立地对北海道的上白垩纪沉积物进行了实地研究，寻找被子植物和裸子植物的化石树木、花、水果和种子。对这些化石进行了解剖学研究，其中一些化石在日本植物学会、日本植物解剖学学会、日本古生物学会等会议上作了初步报告。1996年5月下旬，全体研究人员在日本北海道西北部的大比拉河上游地区对上白垩纪沉积物进行了研究。在档案研究中，收集了许多被子植物的化石木材、一些花和果实、许多针叶树的化石木材和球果以及一些已灭绝的裸子植物的果实。所有这些化石都经过了解剖研究。本研究从晚白垩世最早的Cenomanian时期发现了2个被子植物木材标本。这是日本最古老的被子植物木材记录。1996年12月在日本植物学会年会（东北地区会议）上初步介绍了这些木材的木材结构。

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.