The 133rd Annual Meeting of the Geological Society of Japan
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Session OralT16[Topic] Regional geology and stratigraphy: comprehensive understanding

T16[Topic] Regional geology and stratigraphy: comprehensive understanding

Sun. Sep 13, 2026 8:45 AM - 12:00 PM JST
Sun. Sep 13, 2026 11:45 PM - 3:00 AM UTC
oral room 2(AV lecture room)
Chiar:Mitsuhiro NAGATA, Sato, Daisuke
8:45 AM - 9:00 AM JST(11:45 PM - 12:00 AM UTC)

[T16-O-1]A hyper-time-resolution paleomagnetic record of the Gauss-Matuyama geomagnetic reversal from a boring core of a Plio-Pleistocene marine succession in the southernmost part of the Boso Peninsula, Japan

*Makoto Okada1, Ryoka Yuhara1, Daiki Nagatomo1, Yusuke Suganuma2 (1. Ibaraki University, 2. National Institute of Polar Research)
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9:00 AM - 9:15 AM JST(12:00 AM - 12:15 AM UTC)

[T16-O-2]Stratigraphy and sedimentary age of the basal Kazusa Group exposed in Onaura, Katsuura City, eastern Boso Peninsula

*Masayuki Utsunomiya1, Yuki Haneda1 (1. Geological Survey of Japan, AIST)
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9:15 AM - 9:30 AM JST(12:15 AM - 12:30 AM UTC)

[T16-O-3]Holocene deposits in Tsukuriyama Kofun Area, Okayama Prefecture, Japan

*Shigeyuki Suzuki1, Jun Mitsumoto1, Yuji Yamaguchi2, Masashi Mori3, Yuuya Tsujimoto3 (1. Okayama University, 2. Tokushima University, 3. Paleo Labo Co., Ltd.)
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9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)HighlightentryECS: Early Career Scientist

[T16-O-4]Organic carbon isotope stratigraphy and redox conditions of the Lower Cretaceous Hinagu Formation in the Kurosegawa Belt, western Kumamoto, Japan

*Kohei KAWAKAMI1, Kento Motomura1, Tetsuji Onoue1 (1. Kyushu Univ.)
【ハイライト講演】白亜紀の海洋では，酸素の乏しい水塊が広がる海洋無酸素事変が複数回起きていた．本発表では，熊本県の下部白亜系日奈久層について，泥岩の有機炭素同位体比と元素濃度から酸化還元環境を検討する．酸化還元指標に大きな変化がない一方で認められた炭素同位体比変動を，海洋無酸素事変に関連する広域的な環境変化と対比できる可能性を探る発表である．  ※ハイライト講演とは．．．
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9:45 AM - 10:00 AM JST(12:45 AM - 1:00 AM UTC)

[T16-O-5]Sedimentary facies, sequence, and chorono-stratigraphy, and sedimentary history of the Upper Cretaceous Kuji Group, Northeast Japan: Perspectives from of examples of regional geology and stratigraphy researches

*Hisao ANDO1 (1. Fukui Prefectural University)
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10:00 AM - 10:15 AM JST(1:00 AM - 1:15 AM UTC)HighlightentryECS: Early Career Scientist

[T16-O-6]Investigation into the Factors Controlling the Formation of the Inoceramus uwajimensis Acme Zone Toward Proposing a SABS for the Turonian/Coniacian Boundary in the North Pacific Province

*Kosuke TAKAHASHI1, Reishi TAKASHIMA2, Masanari ARAO1, Toshiro YAMANAKA3, Taiga TOMARU1, Azumi KUROYANAGI2 (1. Department of Earth Science, Graduate School of Science, Tohoku University, 2. The Center for Academic Resources and Archives Tohoku University Museum, 3. Tokyo University of Marine Science and Technology)
【ハイライト講演】最近，北海道苫前地域の古丹別川セクションで高解像度の統合層序が構築され，白亜紀の国際年代境界を補助する模式地「SABS」の候補となる可能性が示された．本発表では，年代境界付近の二枚貝密集帯について，当該地域内2地点の地層対比と岩相・元素組成の解析から形成要因と同時性を検証し，SABSで境界を認定・対比する地域的指標としての有効性を探る．   ※ハイライト講演とは．．．
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10:15 AM - 10:30 AM JST(1:15 AM - 1:30 AM UTC)

[T16-O-7]Sedimentary and Depositional Environment of the Basal Upper Cretaceous Izumi Group: An Unconformity at Shiroyama Coast, Higashikagawa, Japan

*Kazuki Takazawa1, Shoichi Kiyokawa1, Minoru Ikehara3, Kento Motomura1, Naoto Takahata2 (1. Kyushu Univ., 2. Atmosphere and Ocean Research Institute, The Univ. of Tokyo, 3. Marine Core Research Institute, Kochi Univ.)
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10:30 AM - 10:45 AM JST(1:30 AM - 1:45 AM UTC)

Break

10:45 AM - 11:00 AM JST(1:45 AM - 2:00 AM UTC)

[T16-O-8]Age estimation using molluscan fossils from the Otokawa Formation in the Toyama Prefecture, central Japan.

*Hideaki NAGAMORI1 (1. AIST)
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11:00 AM - 11:15 AM JST(2:00 AM - 2:15 AM UTC)ECS: Early Career Scientist

[T16-O-9]Two pulses of Paleocene magmatism in the Noto Peninsula, central Japan: New evidence from U–Pb zircon geochronology

*Mitsuhiro NAGATA1, Raiki YAMADA2, Sota NIKI3, Takafumi HIRATA4 (1. Department of Earth and Environmental Sciences, College of Humanities and Sciences, Nihon University, 2. Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology , 3. Institute for Space and Earth Environmental Research, Nagoya University, 4. Geochemical Research Center, the University of Tokyo)
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11:15 AM - 11:30 AM JST(2:15 AM - 2:30 AM UTC)

[T16-O-10]Magnetostratigraphy of the Nohi Rhyolites: an example of paleomagnetic dating of a volcano-plutonic complex

*Hiroyuki Hoshi1, Kazuki Sako2 (1. Aichi University of Education, 2. Chisato Junior High School)
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11:30 AM - 12:00 PM JST(2:30 AM - 3:00 AM UTC)Highlight

[T16-O-11](Invited) Lithostratigraphy of the Lower Miocene Iwaine Formation in the Yatsuo area, Toyama Prefecture, Japan: Eruptive style of large-scale volcanism during the opening of the Sea of Japan

*Raiki YAMADA1 (1. National Institute of Advanced Industrial Science and Technology)
【ハイライト講演】開催地・金沢に近い富山県八尾地域には，約1700万年前の日本海拡大期の大規模な火山活動が記録されている．本招待講演では，溶岩や火山灰，河川堆積物などの詳細な岩相・堆積相解析に，年代や化学組成の研究成果を組み合わせ，短期間に大量の安山岩質溶岩が広がる「洪水安山岩」様の火山活動により溶岩台地が形成された可能性を示す．地域地質から日本列島規模の変動を読み解く注目の発表である．  ※ハイライト講演とは．．．
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