本州西端部油谷湾地域の漸新世野田植物群 (2)

概要

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The Noda flora of 34 species consists mainly of broad-leaved deciduous trees with an admixture of some broad-leaved evergreen trees and a conifer Glyptostrobus. It consists of extant genera except for Litseaphyllum and Leguminosites, and has several species recorded from the Miocene rocks in East Asia. A few species, Berberis saseboensis, Populus eowightiana and Alnus prenepalensis, are characteristic in Paleogene floras. The Noda flora shows a modernized aspect, being similar to the Daibo flora from the upper part of the Noda Group and also to the Daijima-type floras (late Early to earliest Middle Miocene) in its composition and components. The Ainoura flora in Kyushu, formerly referred to represent the earliest Miocene, is considered to be nearly contemporaneous with the Noda flora, although differs in dominant species and other floral features. The floral, megafaunal, micropaleontological and radiometric evidences indicate that the Noda flora is assigned to be Late Oligocene in age.
国立科学博物館の論文