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Title: 有明海域の第四系の花粉層序学的研究
Other Titles: Palynostratigraphic study of the Quaternary formations of the Ariake Sea area
Authors: 高橋, 清 / 川崎, 敏 / 古川, 博恭
Authors (alternative): Takahashi, Kiyoshi / Kawasaki, Satoshi / Furukawa, Hiroyasu
Issue Date: 25-Dec-1969
Citation: 長崎大学教養部紀要. 自然科学. 1969, 10, p.49-66
Abstract: 1) The Quaternary formations of the Ariake Sea area are divided into five formations, that is, the lowest, lower, middle, upper, and pumice-tuff formations (see table 1). 2) These formations, excepting the pumice-tuff formation, are zoned by the differences of the pollen-spore assemblages. Palynostratigraphic classification is as follows. The upper formation represents the A-type pollen group consisting mainly of Pinus, Gleicheniaceae, Tsuga, Ilex, Fagus, Picea, Polypodiaceae etc. The middle formation contains many pollen grains of Taxodiaceae (Metasequoia predominant), Alnus, Picea etc. which are the main members of the B-type pollen group. The lower formation representing the C-type pollen group, contains predominant pollen grains of Quercus, Castanea, Chenopodiaceae, Pinus etc. The lowest formation consists mainly of Fagus Pinus, Quercus, Zelkova or Ulmus etc. This assemblage is named the D-type pollen group and represents probably the lower Fagus zone in this area. 3) The pollen-spore assemblage obtained from the Kuriya-gawa (Kuriya river) clay bed consists predominantly of spore and pollen grains of Pinus, Ilex, and Gleicheniaceae, and next of Fagus, Quercus, Polypodiaceae, Tsuga, Picea, Zelkova or Ulmus etc. This has the same characteristics as the A-type pollen group. 4) In the Tatsuishi district, the humus mud bed (sample: Hikimuta nos. 4 and 5) contains the microflora of Taxodiaceae (Metasequoia predominant), Alnus, Picea etc. and shows the characteristics of the B-type pollen group. This bed is undoubtedly correlated with the middle formation. The sample Hikimuta no. 2, bluish gray silt, is composed of the main pollen grains of Alnus and Taxodiaceae, which are very similar to the characteristics of the B-type pollen group. The sample Hikimuta no. 1, humus mud, shows the high appearance percentage of Fagus, and this assemblage is similar to the characteristics of the D-type pollen group. The sample from the upper part of the Kita-Arima formation at Kitadani, dark greenish gray fine sand, contains predominantly pollen grains of Quercus, Castanea, Fagus, Pinus etc. This assemblage resembles the C-type pollen group, but this assemblage may possibly belong to a lower horizon than the Fagus zone of the D-type pollen group. 5) In the pollen-spore assemblage from the Nagasu Formation, Fagus and Pinus show the most predominant appearance and Picea, Tsuga, Quercus, Castanea, Ilex, Gleicheniaceae, Zelkova or Ulmus etc. are next. This assemblage can be compared with the D-type pollen group. However, as a possible correlation, this may be the same Fagus zone as the upper Fagus subzone of the Osaka Group. This problem of correlation has to be solved in the near future.
URI: http://hdl.handle.net/10069/16465
ISSN: 02871319
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:Volume 10

Citable URI : http://hdl.handle.net/10069/16465

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