マスダ ヨシキ   Yoshiki Masuda
  益田 芳樹
   所属   川崎医療福祉大学  医療福祉学部 臨床心理学科
   職種   特任教授
論文種別 原著
言語種別 日本語
査読の有無 査読なし
表題 熊本県益城町の津森層から産出した淡水海綿化石
掲載誌名 正式名:豊橋市自然史博物館研究報告
ISSNコード:09171703
巻・号・頁 14,1-7頁
著者・共著者 松岡敬二, 益田芳樹, 北林栄一
発行年月 2004/03
概要 Fossils of the spongillid sponge, Eunapius fragilis and Ephydatia muelleri occur in the Middle Pletstocene Tsumori Formation in Mashiki-machi, Kumamoto Prefecture, Kyushu, Japan. This is the 2nd record of fossil Eunapius fragilis and Ephydatia muelleri from the Pleistocene in Japan. The Tsumori Formation consists of a lacustrine sediment which contains fossils of diatoms, plant fragments, sponges, molluscs, insects and fish. The fossil sponges occur in the lower part of Tsumori Formation that is subdivided into the lower and upper parts with lithological characters. The fossils are found on the surface of plant fragments and in massive mudstone. Those occurrences suggest that the sponges were rapidly deposited after death of the sponge. If the habitat preferences of the sponges have not change over time, the fossil sponges from the lower part of the Tsumori Formation is inferred to have been formed shallow lake with water of high mineral and organic contents.