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Aktastioceras nishikawai n. sp., a first Permian bactritoid cephalopod from Japan

Published online by Cambridge University Press:  20 May 2016

Shuji Niko ,
Tamio Nishida  and
Takashi Hamada
Shuji Niko
Affiliation:
Department of Environmental Studies, Faculty of Integrated Arts and Sciences, Hiroshima University, Hiroshima 730, Japan
Tamio Nishida
Affiliation:
Department of Earth Sciences and Astronomy, College of Arts and Sciences, The University of Tokyo, Tokyo 153, Japan
Takashi Hamada
Affiliation:
Department of Earth Sciences, Faculty of Education, Saga University, Saga 840, Japan
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Abstract

A new Permian bactritoid cephalopod, Aktastioceras nishikawai n. sp., was discovered from the Uyamano Formation of the Taishaku Limestone Group at Miharanoro, Hiroshima Prefecture (Figure 1). The Uyamano Formation represents the Lower Permian portion of the Central Facies, which was defined by Hase et al. (1974) in a large reef complex deposited during the period of Early Carboniferous to Late Permian age. Lithofacies of the formation mainly consist of limestone, including the reef core facies with minor amounts of a limestone conglomerate. The specimens of Aktastioceras occur in light-gray massive limestone of the lowest Uyamano Formation, belonging to the Pseudoschwagerina Zone (Akagi, 1958), which indicates Asselian age. This is the first record of a Permian bactritoid from Japan.

Type
Taxonomic Notes
Information
Journal of Paleontology , Volume 67 , Issue 2 , March 1993 , pp. 314 - 316
Copyright
Copyright © The Paleontological Society 

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References

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