Late Cenozoic flora and vegetation changes in northeast Honshu, Japan

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  • 東北地方における後期新生代の植物相および植生の変遷
  • 東北地方における後期新生代の植物相および植生の変遷--故鈴木敬治,故相馬寛吉両先生の業績をもとにして
  • トウホク チホウ ニ オケル コウキ シンセイダイ ノ ショクブツソウ オヨビ ショクセイ ノ ヘンセン コ スズキ ケイジ コ ソウマ カンキチ リョウ センセイ ノ ギョウセキ オ モト ニ シテ
  • Contribution of Late Professors K. Suzuki and K. Sohma
  • 故鈴木敬治，故相馬寛吉両先生の業績をもとにして

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The Upper Cenozoic Yamato Group in Aizu Basin, Northeast Honshu, ranges from the Upper Miocene to the Middle Pleistocene and is divided into the Fujitoge, Izumi, Nanaorezaka, and Todera Formations, in ascending order. Each formation is subdivided into three, two, five, and six plant fossil assemblage zones, respectively. For the Upper Pleistocene, four plant fossil assemblage zones are recognized in terrace deposits. The Shirako and Sudani plant fossil assemblage zones in the Late Miocene are characterized by temperate elements accompanied by a few subtropical elements. After the Natsui zone, the Koyanaizu zone in the Early Pliocene is mainly characterized by temperate elements. Around the boundary of the Koyanaizu and the Fukurohara zones, close to the Gauss- Matsuyama boundary, many taxa disappeared and several taxa including exotic ones appeared. Since the end of the Olduvai subchron, Metasequoia became rare except for its pollen. The most significant vegetation change characterized by the extinction of Tertiary-type taxa and exotic taxa and the appearance of subarctic taxa occurred between the Jaramillo subchron and the Matsuyama-Brunhes boundary. After the Jaramillo subchron, periodical changes of vegetation were associated with more distinct climatic cycles of warm and cold periods. The temperate deciduous broad-leaved forest alternated with the boreal coniferous forest, and the vegetation gradually became similar to the modern one.

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