Ishida, Keisuke Laboratory of Geology, Institute of SAS, University of Tokushima Tokushima University Educator and Researcher Directory KAKEN Search Researchers
Suzuki, Sigeyuki Graduate School of Natural Science and Technology, Okayama University
Inada, Noriyuki Geoengineering Division of the Dia Consultants Co. Ltd.
Ko-yama Limestone Group
Departmental Bulletin Paper
Carboniferous clastic carbonates associated with basaltic pyroclasts and spicular chert beds in the lower part of the Ko-yama Limestone Group contain the Visean –Moscovian conodont succession of Gnathodus semiglaber (late Visean), Gnathodus praebilineatus – Lochriea multinodosa (late Visean), Lochriea ziegleri – Gnathodus girtyi girtyi s.l. (early Serpukhovian), Neoganthodus symmetricus – Idiognathodus primulus (middle – late Bashkirian), and Idiognathoides convexus – Gondolella clarki (early Moscovian). The FAD of Lochriea ziegleri marks the Visean/Serpukhovian boundary in the section. The middle – late Bashkirian Neoganthodus symmetricus – Idiognathodus primulus Fauna is a mixed fauna containing reworked Serpukhovian and older elements possibly related to an erosional event after the Early Bashkirian global eustatic low-stand. The revision of conodont zonal correlation in the Akiyoshi Belt was examined with the Mississippian/Pennsylvanian boundary considering the FAD of Declinognathodus noduliferus in the previously proposed zones in the similar Hina, Atetsu, Akiyoshi and Omi limestone groups. Idiognathodus craticulinodosus n. sp. was described as the middle – late Bashkirian to early Moscovian index.
徳島大学総合科学部自然科学研究 = Natural Science Research, The University of Tokushima
LID201312092001.pdf 11 MB
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