日本北上南带上泥盆统川池组的石鳞藻及其地层意义

Journal of the Geological Society of Japan Pub Date : 2018-02-15 DOI:10.5575/GEOSOC.2017.0057

J. Tazawa, I. Niikawa

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引用次数: 2

摘要

Choanji组是日本东北部北上南带Choanji地区以砂岩和页岩为主的上泥盆统(弗拉斯系—法门系)地层。晚泥盆世腕足类，Desquamatia (Seratrypa)和Cyrtospirifer分别出现在Choanji组中部和上部。前者在日本是第一次被描述。

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Desquamatia ( Seratrypa ) from the Upper Devonian Choanji Formation in the South Kitakami Belt, Japan, and its stratigraphical significance

The Choanji Formation is newly defined as an Upper Devonian (Frasnian ‒ Famennian) sandstone- and shale-dominanted formation, in the Choanji area, South Kitakami Belt, northeastern Japan. The Late Devonian brachiopods, Desquamatia ( Seratrypa ) and Cyrtospirifer occur within the middle and upper parts of the Choanji Formation, respectively. The former is described for the ﬁrst time in Japan.

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Journal of the Geological Society of Japan

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