Diatom biostratigraphic age of a whale fossil occurred in the Horonitachibetsu River, Numata, Hokkaido.

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  • 北海道沼田町の幌新太刀別川支流で産出した鯨類化石の珪藻化石年代
  • ホッカイドウ ヌマタマチ ノ ホロ シン タチ ベツガワ シリュウ デ サンシュツ シタ クジラルイ カセキ ノ ケイソウ カセキ ネンダイ

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Abstract

<p>Many occurences of fossil marine vertebrates and their age estimations have been reported from Numata Town, Hokkaido, Japan. Most of the fossil records are known from the upper part of the Horokaoshirarika Formation. The lower part of the formation has just a few reports so far. We examined fossil diatoms of a float rock with a fossil whale (NFL 2083; Numata Fossil Museum specimen), which probably is from the lower part of the formation. The diatom assemblage from NFL 2083 is assigned to the lower part of the Rouxia californica Zone (NPD7A, Yanagisawa and Akiba 1998; 7.7–6.8 Ma) based on the absence of Neodenticula kamtschatica, very rare occurrence of Thalassionema schraderi and occurrence of Nitzschia pliocena. Comparing the age to diatom biostratigraphic study in adjacent area, the determined age does not correspond to the age of the Horokaoshirarika Formation but correspond to the underlying Mashike Formation. This implies that there still remains unsolved problem on the stratigraphy of the studied area.</p>

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