Solid Earth Sciences(S)
Session Sub-categoryGeology
Session IDS-GL32
TitleLower-Middle Pleistocene Boundary GSSP in the Kazusa Group
Short TitleL-M Boundary GSSP
Main ConvenerNameMakoto Okada
AffiliationDepartment of Earth Sciences, Faculty of Science, Ibaraki University
Co-Convener 1NameYusuke Suganuma
AffiliationNational institute of Polar Research
Co-Convener 2NameKoji Kameo
AffiliationDepartment of Earth Sciences, Faculty of Science, Chiba University
Co-Convener 3NameYoshimi Kubota
AffiliationNational Museum of Nature and Science
Session LanguageJJ
ScopeIn the Chiba Composite Section, a candidate for the Lower-Middle Pleistocene GSSP which is currently under review, a lot of stratigraphic studies using paleomagentism, marine microfossils, tephra layers and isotopes have been conducted intensively to propose GSSP. The aim of this session is to summarize and discuss scientific results from those studies including stratigraphic, chronologic and sedimentologic researches focusing on the Chiba Composite Section and/or some other contemporary sedimentary sequences.
Presentation FormatOral and Poster presentation
Co-Sponsoring Societies
(Society Members)
The Geological Society of Japan
Time Presentation No Title Presenter Abstract
Oral Presentation May 24 PM2
15:30 - 15:45 SGL32-01A summary of the Chiba Section, Japan: a proposed Global Boundary Stratotype Section and Point (GSSP) for the base of the Middle Pleistocene SubseriesYusuke Suganuma Abstract
15:45 - 16:00 SGL32-02A high-resolution biostratigraphy of calcareous nannofossils around the Matuyama-Brunhes boundary in the Kokumoto Formation, Kazusa Group, in the Boso Peninsula, central JapanKoji Kameo Abstract
16:00 - 16:15 SGL32-03A high resolution paleomagnetic record across the Matuyama-Brunhes polarity transition from the Chiba composite section, a candidate for the L-M Pleistocene boundary GSSPMakoto Okada Abstract
16:15 - 16:30 SGL32-04Ultra-high temporal resolution foraminiferal isotope records during MIS 19 from the Chiba composite sectionYuki Haneda Abstract
16:30 - 16:45 SGL32-05High-resolution climatostratigraphy for the MIS 19 interglacial from the Chiba SectionMasayuki Hyodo Abstract
16:45 - 17:00 SGL32-06Quantitative paleotemperature reconstruction covering the Early-Middle Pleistocene boundary (MIS18-20) based on the pollen record obtained from the Chiba composite section, SE JapanMasaaki Okuda Abstract
Presentation No Title Presenter Abstract
Poster Presentation May 24 Core Time
SGL32-P01 An integrated chronostratigraphy in the lower Pleistocene Obama Formation, Inubo Group, distributed in the Choshi district, Chiba Prefecture, central Japan, based on data from paleomagnetic and oxygen isotopic analyses Keisuke Yamamoto Abstract
SGL32-P02 Tephrostratigraphy of the Kokumoto Formation, Kazusa Group in the Yoro river route Hiroomi Nakazato Abstract
SGL32-P03 Planktonic foraminiferal faunal changes around the Matuyama–Brunhes boundary in the northwestern Pacific and its paleoceanographic implications Hiroki Hayashi Abstract
SGL32-P04 Radiolarian fossils from the Kokumoto Formation Takuya Itaki Abstract