This is the general term for fossil plants found in the Upper Jurassic to Lower Cretaceous systems (160 to 96 million years ago) distributed in the Outer Zone of Japan, including Iwate, Miyagi, Fukushima, Chiba, Saitama, Gunma, Yamanashi, Nagano, Mie, Wakayama, Tokushima, Kochi, and Kumamoto prefectures. More accurately, it should be called the Ryoseki-type flora. Ryoseki comes from the name of a place in Nankoku City, Kochi Prefecture. The first study of this flora was conducted in 1890 by Swedish geologist Alfred Gabriel Nathorst (1850-1921). Source: Heibonsha World Encyclopedia, 2nd Edition Information |
日本外帯の岩手,宮城,福島,千葉,埼玉,群馬,山梨,長野,三重,和歌山,徳島,高知,熊本各県に分布する上部ジュラ系~下部白亜系(1億6000万~9600万年前)に含まれる化石植物の総称で,正確には領石型植物群というべきである。領石は,高知県南国市の一地名に由来する。この植物群に関する最初の研究は,1890年スウェーデンの地質学者ナトホルストAlfred Gabriel Nathorst(1850‐1921)によって行われた。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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