Glacioeustatic and Paleoceanographic Changes Documented in Shelf and Deep-water Successions of the Plio-Pleistocene Kazusa Group, Boso Peninsula, Japan

摘要

The Plio-Pleistocene (Ca. 2.4-0.45 Ma) Kazusa Group on the Boso Peninsula is an infill of the Kazusa forearc basin and is charac- terized by a thick succession (ca. 3,000m thick) of shallow marine and deep-water siliciclastic sediments intercalated with many volcanic ash beds. Here, we briefly summarize the signifi- cance of the Kazusa Group as a geologic record of late Cenozoic paleoenvironmental changes and discuss some glacioeustatic and paleo- ceanographic features of the group.