Early Cenomanian (Cretaceous) ammonoids Utaturiceras and Graysonites from Hokkaido, North Japan (Studies of the Cretaceous ammonites from Hokkaido and Sakhalin-XCV).
Early Cenomanian (Cretaceous) ammonoids Utaturiceras and Graysonites from Hokkaido, North Japan (Studies of the Cretaceous ammonites from Hokkaido and Sakhalin-XCV).
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来自日本北部北海道的早期塞诺曼阶（白垩纪）菊石 Utaturiceras 和 Graysonites（来自北海道和萨哈林岛的白垩纪菊石研究 - XCV）。
DOI：
10.9795/bullgsj.54.131
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
S. Toshimitsu
中科院分区：
文献类型：
--
作者：
Tatsuro Matsumoto;T. Nishida;S. Toshimitsu
本文报道了北海道西北部Soeushinai地区菊科植物Utaturiceras属的3种（包括U. chrysanthemum sp. nov.）和2种（Graysonites）。它们构成了研究区塞诺曼阶地层的基底亚带。这种区系只在日本有限的部分地区被发现，而在世界上某些特定的遥远的省份也有相关的区系。在某种程度上讨论了这一事实的原因。
Three species of the ammonoid genus Utaturiceras, including U. chrysanthemum sp. nov., and two species of Graysonites, from the Soeushinai area of northwestern Hokkaido, are described under revised diagnoses of the genera. They form the basal subzone of the Cenomanian sequence of strata in the studied area. This faunule is recognized in restricted parts of Japan and the correlatable faunule is also known in certain particular provinces of long distance in the world. The reason for this fact is discussed to some extent.