Japan Geoscience Union Meeting 2016

Presentation information


Symbol O (Public) » Public

[O-02] Poster presentations by senior high school students

Sun. May 22, 2016 1:45 PM - 3:15 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Tatsuhiko Hara(International Institute of Seismology and Earthquake Engineering, Building Research Institute), Miwa Kuri(International Research Institute of Disaster Science, Tohoku University), Keiko Konya(Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology), Hajime Naruse(Department of Geology and Mineralogy, Graduate School of Science, Kyoto University), Kou Yamada(Waseda University)

1:45 PM - 3:15 PM

[O02-P06] Microfossils from the Nihon University Mutsuai Campus core, Fujisawa City, Kanagawa Prefecture

*Haruhi Imahashi1, Yuka Sato1, Arisa Matukura1, Hitomi Saito1, Yoshimi Honda1 (1.Gunma Prefectural Ota girls' high school)

Keywords:ostracode, foraminifera, Fujisawa Mudstone, Paleo-Sagami Bay

Four sediment samples were collected from the Fujisawa Mudstone in the Nihon University Mutsuai Campus core, Fujisawa City, Kanagawa Prefecture, central Japan. This core was situated the middle part of Paleo-Sagami Bay developed during the interglacial period (MIS 5). In total, 26 ostracode species and 47 foraminiferal species were identified in four samples. The dominant ostracode species were Bicornucythere bisanensis, Neomonoceratina delicata and Trachyleberis ishizakii. The dominant foraminiferal species were Elphidium subgranulosum, Pseudorotalia gaimardii, Buccella frigida, Elphidium advenum and Murrayinella minuta. These species are living in middle to outer bays. These data indicate that the depositional environment of the Fujisawa Mudstone at the study site was middle to outer bay area. In addition, the dominant four foraminiferal species were examined the ratio of dextral individuals and sinistral individuals. In the foraminiferal species of Ammonia japonica, M. minuta and P. gaimardii, there are more sinistral individuals than dextral individuals. On the other hand, the foraminiferal species of B. frigida, dextral individuals and sinistral individuals are almost the same number.