Late Triassic ammonoid Sirenites from the Sabudani Formation in Tokushima, Southwest Japan, and its biostratigraphic and paleobiogeographic implications

Yasuyuki Tsujino, Yasunari Shigeta, Haruyoshi Maeda, Toshifumi Komatsu, Nao Kusuhashi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Discovery of Sirenites senticosus (Dittmar) in the upper part of the Sabudani Formation of the Kurosegawa Belt, Kito area, Tokushima Prefecture, Japan, establishes a late Early Carnian age for this part of the stratigraphic unit. Because S.senticosus was mainly distributed in the Tethyan region, its occurrence provides evidence that Late Triassic ammonoids of Japan had strong affinities with those of the Tethyan faunas. This finding clearly differs from the biogeographic distribution of contemporary bivalves in the region, which are referred to as the Kochigatani bivalve faunas, and show strong affinities to faunas of the Boreal region.

Original languageEnglish
Pages (from-to)549-561
Number of pages13
JournalIsland Arc
Volume22
Issue number4
DOIs
Publication statusPublished - Dec 1 2013

All Science Journal Classification (ASJC) codes

  • Geology

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