A fossil genus belonging to the gymnosperm family Ginkgoaceae. Fossil leaves with deeply incised fan-shaped leaf surfaces. They first appeared in the Mesozoic Era, flourished in the Jurassic Period, and were distributed worldwide in the Cretaceous Period, but became extinct in Europe and North America toward the end of the Neogene Period of the Cenozoic Era. The extant species of ginkgo, Ginkgo biloba , which has survived to the present day in Japan and China, is morphologically indistinguishable from those found in the Triassic Period. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
裸子植物イチョウ綱イチョウ科に属する化石属。扇状の葉面が深く切れ込んだ形式の葉の化石。中生代に初めて出現し,ジュラ紀に最も栄え,白亜紀には全世界に分布したが,ヨーロッパや北アメリカでは新生代新第三紀の終わり頃に絶滅。日本や中国で現世まで生き延びている現生種のイチョウ Ginkgo biloba は,三畳紀産のものと比較しても,形態的には区別できないほどよく似ている。
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