Ammonoid Fauna of the Upper Olenekian Osawa Formation in the Utatsu Area, South Kitakami Belt, Northeast Japan

Autor:	Masayuki Ehiro, Harumasa Kano, Osamu Sasaki
Rok vydání:	2016
Předmět:	010506 paleontology biology Ecology Nekton Fauna Early Triassic Paleontology 010502 geochemistry & geophysics biology.organism_classification 01 natural sciences Albanites Ecology Evolution Behavior and Systematics Geology 0105 earth and related environmental sciences
Zdroj:	Paleontological Research. 20:90-104
ISSN:	1880-0068 1342-8144
DOI:	10.2517/2015pr024
Popis:	A late Olenekian (Early Triassic) ammonoid fauna is described from the Osawa Formation in the Utatsu area, South Kitakami Belt, Northeast Japan. The fauna comprises 14 species belonging to 13 genera: Hemilecanites discus (Arthaber), Albanites sheldoni (Kummel), Pseudosageceras? sp., Pseudokymatites tabulatus sp. nov., Columbites parisianus Hyatt and Smith, Tardicolumbites aff. tardicolumbus Guex et al., Yvesgalleticeras sp., Subcolumbites sp., Hellenites elegans Guex et al., Metadagnoceras sp., Procarnites sp., Leiophyllites wakoi sp. nov., Leiophyllites? sp., and Nordophiceratoides bartolinae Guex et al. Among them, genera Hemilecanites, Albanites, Pseudokymatites, Tardicolumbites, Yvesgalleticeras, Hellenites, and Nordophiceratoides are described for the first time from the Japanese Triassic. The generic composition of the ammonoid fauna of the Osawa Formation has thus increased to 25 genera by adding these to the 18 existing genera. This high taxonomic diversity indicates that the nektonic fa...
Databáze:	OpenAIRE
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