Abstract
The Middle and Late Triassic was a time of important reef development. This evolution, which is primarily documented in the Tethys realm, comprised several phases from the Anisian to the Rhaetian. To help elucidate the less constrained reef evolution in the Panthalassa domain, samples of reef limestone were collected from several localities along the Sambosan Accretionary Complex in Shikoku Island, southwest Japan. In this paper, we report a well-preserved and comprehensive reef biota, including several taxonomic groups, such as scleractinian corals, calcified sponges, calcareous algae, foraminifers, and microproblematica. Seventeen species are described for the first time in Japan among the 33 that are identified in this study. The assemblage-based biostratigraphy and index taxa indicate a Ladinian?-Carnian age. This new finding corresponds to an older reef limestone than has been previously identified in the Sambosan Accretionary Complex and may represent the initiation of shallow-water carbonate deposition on western Panthalassa seamounts. This work also provides valuable insights on reef ecosystem biodiversity in the Panthalassa domain during the Middle? to Late Triassic.
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Acknowledgments
This contribution is part of the REEFCADE projects (Swiss National Science Foundation #200020-156422 and 200020-137661). We thank Professor Tetsuji Onoue and Daisuke Yamashita for their help in the field and discussion about the SAC. Roberto Rettori, Sylvain Rigaud, Michaela Bernecker, Bernard Lathuillière, Elias Samankassou, and Ewa Ronieviwcz are thanked for the useful discussions and help concerning the micropaleontological determinations. Baba Senowbari-Daryan and an anonymous reviewer are thanked for their valuable comments.
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Peybernes, C., Chablais, J. & Martini, R. Upper Triassic (Ladinian?-Carnian) reef biota from the Sambosan Accretionary Complex, Shikoku, Japan. Facies 61, 20 (2015). https://doi.org/10.1007/s10347-015-0446-4
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DOI: https://doi.org/10.1007/s10347-015-0446-4