[S-GL44_2PM2] The Lower-Middle Pleistocene boundary of the Kazusa Group

Fri. May 2, 2014 4:15 PM - 5:45 PM 421 (4F)

Convener:*Makoto Okada(Department of Earth Sciences, Faculty of Science, Ibaraki University), Chair:Makoto Okada(Department of Earth Sciences, Faculty of Science, Ibaraki University)

The Lower-Middle Pleistocene Boundary GSSP, which is placed to be around the Matuyama-Brunhes boundary, is going to be ratified in 2015. Three candidates (Montalbano Jonic, Valde di Manche and the Chiba Section) have been proposed so far. The aim of this session is to facilitate GSSP ratification at the Chiba Section through discussion for stratigraphic, chronologic and sedimentological studies regarding with the Mid Kazusa Group.

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4:15 PM - 4:30 PM

[SGL44-08] The Kazusa Group as a standard tephrostratigraphy of Japanese Lower to Middle Pleistocene formations

*Yasufumi SATOGUCHI¹ (1.Lake Biwa Museum)

4:30 PM - 4:45 PM

[SGL44-09] Reconstruction of paleogeography of Kanto district about 1.6 Ma based on tephrostratigraphy

*Eri NAKAJIMA¹, Takehiko SUZUKI² (1.Graduate student, Tokyo Metropolitan University, 2.Tokyo Metropolitan University)

4:45 PM - 5:00 PM

[SGL44-10] Stratigraphy of the L-M Pleistocene boundary section in the Kokumoto Formation with re-definition of the Byk-TNTT tephra

*Osamu KAZAOKA¹, Makoto OKADA², Shun KAMEYAMA¹, Yusuke SUGANUMA³, Nobuyuki AIDA⁴, Masaaki MORISAKI¹, Atsushi KAGAWA¹, Hisao KUMAI⁵, Hisashi NIREI⁶ (1.Research Institute of Environmental Geology, Chiba, 2.Ibaraki University, 3.National Institute of Polar Research, 4.Shumei University, 5.Osaka City University, 6.Officer of IUGS-GEM)

5:00 PM - 5:15 PM

[SGL44-11] Lower - Middle Pleistocene Boundary at Chiba Section and istribution situation of Byakubi Ash, central Japan

*Hideto KIMURA¹, Osamu KAZAOKA², Hisashi NIREI³ (1.Toho Chisui Co., Ltd. Kanto office, 2.Research Institude of Environmental Geology, Chiba, 3.International Union of Geological Science for Environmental Management(IUGS-GEM))

5:15 PM - 5:30 PM

[SGL44-12] Tephras of the Kokumoto Formation in the Mobara area

*Hiroomi NAKAZATO¹, Futoshi NANAYAMA² (1.NARO, 2.AIST)

5:30 PM - 5:45 PM

[SGL44-13] The source volcano and age of the Byakubi tephra in the Kazusa Group in Boso Peninsula, central Japan

*Takashi UCHIYAMA¹, Yoshihiro TAKESHITA², Hisao KUMAI³ (1.Yamanashi Institute of Environmental Sciences, 2.Shinshu University, 3.Prof. Emeritus, Osaka City University)