Abstract
This study presents the results of the conodont biostratigraphy and microfacies analysis carried out on the pelagic limestones of the Upper Triassic Dovško Section in Slovenia, which represents the eastern part of the Slovenian Basin. The age of the section ranges from the Lacian 1 to the Alaunian 1. The Lacian part of the succession is predominantly characterized by the representatives of the genus Ancyrogondolella. Transitional morphologies towards Alaunian faunas first appear in the Lacian 3 and become common during the Lacian-Alaunian transition. This evolutionary development coincides with a shift in microfacies from a dominantly radiolarian-bearing mudstone-wackestone-packstone to a filament- dominated wackestone-packstone, and the formation of small neptunian dykes, which may reflect environmental perturbations and/or a change in basin geometry. The proliferation of the genera Epigondolella and Mockina is observed in the Alaunian part of the section, though the genus Ancyrogondolella is still present in this interval. Systematic description of the conodont taxa is provided, and seven new species and two new subspecies are established. The new advances will be of great value in further biostratigraphic studies, especially in areas without ammonoid faunas, and in the reconstruction of the paleogeography of the Slovenian Basin.
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Acknowledgments
This study was partially supported by the Slovenian Research Agency (No. P1–0011) and partially by the NKFIH PD-131536 Project. Open Access funding enabled and organized by Projekt DEAL. The authors are grateful to Martyn Golding and Ali Murat Kiliç for improving the manuscript with their constructive reviews. Facilities and technical staff of the Geological Survey of Slovenia are gratefully acknowledged, especially Marija Petrović for processing numerous conodont samples and Miloš Miler for his skillful assistance in taking SEM images. The work of Section “SYSTEMATIC PALEONTOLOGY” was conducted by Viktor Karádi and Tea Kolar-Jurkovšek. The final publication is available at Springer via https://doi.org/10.1007/s12583-020-1382-y.
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Karádi, V., Kolar-Jurkovšek, T., Gale, L. et al. New Advances in Biostratigraphy of the Lower/Middle Norian Transition: Conodonts of the Dovško Section, Slovenia. J. Earth Sci. 32, 677–699 (2021). https://doi.org/10.1007/s12583-020-1382-y
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DOI: https://doi.org/10.1007/s12583-020-1382-y