Diatom
Online ISSN : 2186-8565
Print ISSN : 0911-9310
ISSN-L : 0911-9310
岡山・鳥取県境に分布する人形峠層(上部中新統~鮮新統)から見出された淡水生珪藻化石群集
田中 宏之鈴木 秀和南雲 保
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ジャーナル フリー

2008 年 24 巻 p. 51-62

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Investigation of four samples taken from an outcrop of the Ningyotoge Formation (Late Miocene to Pliocene), around the Ningyo Pass, between Okayama and Tottori Prefectures, Japan, revealed 101 taxa in 42 genera of fossil freshwater diatoms. Diatom assemblages of the four samples were dominated by centric diatoms (7 taxa) with a frequency of 56-82%, followed by araphid pennate diatoms (21 taxa) 7-18%, monoraphid pennate diatoms (13 taxa) 6-10% and biraphid pennate diatoms (60 taxa) 4-16%. Taxonomic information on 10 of the diatom taxa is reported here: Aulacoseira ambigua (Grunow) Simonsen, Aulacoseira sp., Discostella sp., Cocconeis placentula Ehrenb. var. lineata (Ehrenb. ) Van Heurck, Didymosphenia sp., Epithemia cistula (Ehrenb. ) Ralfs, Gomphonema sp., Melosira undulata (Ehrenb. ) Kütz., Synedra capitata Ehrenb. and Tetracyclus stellare var. eximius (Hérib. & Perag. ) Hust. Of particular interest is the presence of a Didymosphenia taxon, indicating that a cool temperate climate existed during the formation of the deposit. Six taxa of Tetracyclus occurred in the fossil diatom assemblage.

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