Middle Permian ammonoids from the Kamiyasse-Imo district in the Southern Kitakami Massif, Northeast Japan
Middle Permian ammonoids from the Kamiyasse-Imo district in the Southern Kitakami Massif, Northeast Japan
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DOI：
10.2517/prpsj.9.1
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发表时间：
2005-04
期刊：
影响因子：
--
通讯作者：
M. Ehiro;A. Misaki
中科院分区：
文献类型：
--
作者：
M. Ehiro;A. Misaki
摘要：在日本东北部北上山南部气仙沼北部的神崖-伊莫地区，发现了中二叠世的细寿组和神崖组的氨气类动物。动物群包括以下属：副astacheoceras， Demarezites, Demarezites？Waagenoceras, timmorites, taroceras ？卡迪拉，阿德里安人，阿加西克拉，阿加西克拉？对西甲人、基波人。新发现的双角拟虾（Parastacheoceras bidentatus gen.和sp. 11 .）。Demarezites属、Tauroceras属、Cardiella属和Adrianites属首次在日本被描述。据此，河秀组中段、河秀组上段至神亚塞组中下段、神亚塞组中上段分别与中二叠统Roadian、Wordian和Capitanian相对应。Demarezites属和Cardiella属的发现有力地支持了之前关于南北上古陆位于中二叠世赤道省的假设。
ABSTRACT Middle Permian ammonoid faunas are recognized from the Hosoo and Kamiyasse Formations in the Kamiyasse-Imo district, north of Kesennuma, Southern Kitakami Massif, Northeast Japan. The faunas comprise the following genera: Parastacheoceras, Demarezites, Demarezites?, Waagenoceras, Timorites, Tauroceras?, Cardiella, Adrianites, Agathiceras, Agathiceras?, Paraceltites and Cibolites. Parastacheoceras bidentatus gen. and sp. nov. is newly proposed. The genera Demarezites, Tauroceras, Cardiella and Adrianites are described for first time from Japan. Based on these ammonoids, the middle part of the Hosoo Formation, upper part of the Hosoo Formation to the lower middle part of the Kamiyasse Formation, and upper middle part of the Kamiyasse Formation are correlatable with the Middle Permian Roadian, Wordian and Capitanian, respectively. The discovery of genera Demarezites and Cardiella strongly supports the previous hypothesis that the South Kitakami Paleoland was located in the equatorial province during the Middle Permian.