北海道東部浦幌町の古第三系縫別層から産出する保存の良い珪藻化石  [in Japanese] Well-preserved diatoms (Bacillariophyta) from the lower Oligocene Nuibetsu Formation in the Urahoro area, eastern Hokkaido  [in Japanese]

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Abstract

To provide insight into the biostratigraphy and evolutionary radiation of marine diatoms, Paleogene fossil records are essential because modern floral assemblages are thought to have originated in the late Oligocene. However, Paleogene diatoms are rarely reported from the Northwest Pacific Ocean because of their poor preservation and limited occurrence. In this paper, we report well-preserved diatoms from methane-seepage-induced limestone of the lower Oligocene (Rupelian) Nuibetsu Formation in the Urahoro area, eastern Hokkaido. The diatoms are dominated by <i>Stephanopyxis</i> spp., <i>Odontella sawamurae</i>, Hemiaulus spp., and resting spores. The assemblage is remarkable because it lacks late Oligocene to early Miocene index species, reflecting floral turnover during the Oligocene.

Journal

  • The Journal of the Geological Society of Japan

    The Journal of the Geological Society of Japan 122(2), 81-85, 2016

    The Geological Society of Japan

Codes

  • NII Article ID (NAID)
    130005157155
  • NII NACSIS-CAT ID (NCID)
    AN00141768
  • Text Lang
    JPN
  • ISSN
    0016-7630
  • NDL Article ID
    027162986
  • NDL Call No.
    Z15-174
  • Data Source
    NDL  J-STAGE 
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