抄録
The Nanmatsu Formation was newly described from the western part of the Tsugeno district, Nara Prefecture. It consists-of sands, silts and peaty muds with a characteristic volcanic ash layer. Abundant macro and micro-fossils of plants revealed were described. The radiocarbon dating of the formation using a piece of wood identified as Picea indicates the age of 28, 100±800 y. B. P.
The plant fossil assemblage is characterized by an abundant occurrence of leaves, twigs, wood and pollen of such coniferous trees as Abies, Picea, Tsuga and Pinus including subgen. Haploxylon. Macro and micro fossils of deciduous broad-leaved trees are scarcely occurred. There is an evidence that the Nanmatsu Formation deposited during the Würm Glacial Age, and it appears to state that a coniferous forest mainly composed of Abies veitchii and/or A. homolepis, Picea polita, Tsuga diversifolia and Pinus subgen. Haploxylon pentaphylla might be occupied around the area of the Tsugeno district.
