The 132nd Annual Meeting of the Geological Society of Japan
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Session OralT13 ［Topic Session］Regional geology and stratigraphy: Progress and Review

[2oral611-19]T13. Regional geology and stratigraphy: Progress and Review

Mon. Sep 15, 2025 3:00 PM - 5:30 PM JST
Mon. Sep 15, 2025 6:00 AM - 8:30 AM UTC
oral room 6(E305)
Chiar:Atsushi NOZAKI(Hiratsuka City Museum), Yuki HANEDA(Geological Survey of Japan, AIST)
3:00 PM - 3:15 PM JST(6:00 AM - 6:15 AM UTC)entry

[T13-O-1]Integrated bio- and carbon isotope stratigraphy across the Turonian/Coniacian boundary in the Yezo Group, Hokkaido, and high-resolution international stratigraphic correlations.

*Kosuke TAKAHASHI1, Reishi TAKASHIMA2, Ireneusz WALASZCZYK3, Toshiro YAMANAKA4, Taiga TOMARU1, Azumi KUROYANAGI2 (1. Department of Earth Science, Tohoku University, 2. The Center for Academic Resources and Archives Tohoku University Museum, 3. Warsaw University, 4. Tokyo University of Marine Science and Technology)
3:15 PM - 3:30 PM JST(6:15 AM - 6:30 AM UTC)

[T13-O-2]Precise correlations between the magnetostratigraphy and the marine isotopic stratigraphy using a marine Plio-Pleistocene succession distributed in the southernmost part of Boso Peninsula, central Japan

*Makoto OKADA1, Akihiro Tanimoto1, Daiki KOTSUKA3, Takumi KONISHI2, Ryoka YUHARA2, Daiki NAGATOMO2 (1. Ibaraki University , 2. Graduate School of Ibaraki University , 3. Geographical Information Authority of Japan)
3:30 PM - 3:45 PM JST(6:30 AM - 6:45 AM UTC)

[T13-O-3]Stratigraphic levels of paleomagnetic polarity transition and widespread tephras in the lower Pleistocene Chikura Group and the lower Kazusa Group on the Boso Peninsula

*Takumi KONISHI1,2, Makoto OKADA1, Masayuki UTSUNOMIYA3 (1. Ibaraki University, 2. Yachiyo Engineering co., Ltd, 3. Geological Survey of Japan, AIST)
3:45 PM - 4:00 PM JST(6:45 AM - 7:00 AM UTC)

[T13-O-4]The Om-SK110 tephra from the lower Pleistocene Hayashi Formation of the Kazusa Group at the southern part of the Miura Peninsula, central Japan.

*Atsushi NOZAKI1, Hiroyuki SHIOI2, Tomohiro KASAMA3, Fumikatsu NISHIZAWA4, Kenichiro SHIBATA5 (1. Hiratsuka City Museum, 2. Kokudo Planning Design (LLC), 3. Hakone Geopark promotion council, 4. Kanagawa Prefectural Museum of Natural History, 5. Yokosuka City Museum)
4:00 PM - 4:15 PM JST(7:00 AM - 7:15 AM UTC)

[2oral611-19-5add]Break

4:15 PM - 4:30 PM JST(7:15 AM - 7:30 AM UTC)

[T13-O-5]The Gauss–Matuyama paleomagnetic boundary in the Horinouchi Formation of the Kakegawa Group in Shizuoka Prefecture, southwestern Japan

*Yuki Haneda1, Koretaka Nakatani1, Kiyohide Mizuno1 (1. Geological Survey of Japan, AIST)
4:30 PM - 4:45 PM JST(7:30 AM - 7:45 AM UTC)

[T13-O-6]Source caldera for the volcaniclastic rocks constituting a giant land slide body in Aratozawa valley, Kurihara, Japan.

*Reishi Takashima1, Yuga Mito2, Masanori Okamoto2, Takuya Harada3 (1. Tohoku University, 2. Idemitsu Kosan Co. Ltd., 3. Mt. Kurikoma Area Geopark Promotion Committee)
4:45 PM - 5:00 PM JST(7:45 AM - 8:00 AM UTC)

[T13-O-7]High Resolution Calcareous Nannofossil Biostratigraphy of the Upper Quaternary System, Offshore Akita: Insight into Late Quaternary Paleoceanography

*Ryoko Setoguchi1, Toshinori Imai1, Tokiyuki Sato2 (1. JOGMEC, 2. Akita University)
5:00 PM - 5:15 PM JST(8:00 AM - 8:15 AM UTC)

[T13-O-8]Geologic age of the "Kotazawako Formation" and its implications for terrestrial climate changes during MIS3 based on plant macrofossils.

*Atsushi YABE1, Kazuhiko UEMURA1, Yayoi UEDA2, Shoichi GOI3, Arata MOMOHARA4 (1. Department of Paleontology and Anthropology, National Museum of Nature and Science, 2. Lake Biwa Museum, 3. Akita Earth Museum Network Office, 4. Graduate School of Horticulture, Chiba University)
5:15 PM - 5:30 PM JST(8:15 AM - 8:30 AM UTC)

[T13-O-9]Fomation process of potholes controlled by cross joints : an example of “ Taki-no-Hai” in Kozagawa Town, Wakayama Prefecture

*KATSUMI KIMURA1, Makoto Kaneko1, Toshiya Yamamoto2 (1. Fukada Geological Institute, 2. Wakayama Prefectural Tanabe High School)
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