化石研究会会誌
Online ISSN : 2759-159X
Print ISSN : 0387-1924
44 巻, 1 号
選択された号の論文の3件中1~3を表示しています
原著
  • 河野 重範, 辻本 彰, 鵜飼 宏明, 入月 俊明, 野村 律夫
    原稿種別: 原著
    2011 年 44 巻 1 号 p. 1-10
    発行日: 2011年
    公開日: 2025/01/23
    ジャーナル フリー

     Fourty-six ostracode species and 41 foraminiferal species were found in two samples (Og-01 and Og-02) from the Pleistocene Ogushi Formation (Marine Isotope Stage 7: ca. 240 ka), Itsuwa-Machi, Amakusa City, Kumamoto Prefecture, Southwest Japan. The most dominant species were Bicornucythere bisanensis (Ostracoda) and Ammonia beccarii (benthic Foraminifera). Total organic carbon (TOC) and total nitrogen (TN) contents of two samples were also analyzed to reconstruct the depositional environment. Neomonoceratina delicata (Ostracoda), which does not live in Japanese Islands north of the Tokara Strait, was found in all samples. Based on microfossil assemblages and CHN analysis, the Ogushi Formation was interpreted to have deposited in muddy middle bay at a water depth of around 10 m under the influence of open water.

  • 岡村 喜明, 高橋 啓一, 里口 保文, 石田 志朗, 服部 昇, 平尾 藤雄, 三矢 信昭
    原稿種別: 原著
    2011 年 44 巻 1 号 p. 11-19
    発行日: 2011年
    公開日: 2025/01/23
    ジャーナル フリー

     The first Japanese record of mammalian tridactyl fossil footprints is reported from the Plio-Pleistocene Kobiwako Group at two sites: Otsu City, Shiga Prefecture and Iga City, Mie Prefecture, Japan. The first site, Ikadachi-mukouzaichi, Otsu City, is the Middle Pleistocene Katata Formation, the uppermost horizon of the Kobiwako Group, and the second site, at Midoro, Iga Ciry, is the Pliocene Iga Formation, the lowest horizon of the Group.

     Comparisons with the footprints and sole shape of extant rhinocerotids and tapiroids indicates that these fossils are identifiable as rhinocerotids, based on morphological characters of the front hoof, the third toe tip, and the posterior margin. This type of footprint is reported from the Pliocene and the Middle Pleistocene of Japan for the first time, although several rhinocerotid molars and postcranial elements have previously been described from these ages.

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