Japan Geoscience Union Meeting 2016

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Poster

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-P04] Fossil Bryozoans from the Itakura core, Gunma Prefecture

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

Keywords:Bryozoa, Paleo-Tokyo Bay, Itakura core, Jizodo Formation, Yabu Formation

The Itakura core was drilled at Itakura Town, Gunma Prefecture. Fossil bryozoans were contained in the Jizodo Formation (about 0.4Ma) and the Yabu Formation (about 0.3Ma) in the Itakura core. On research of the Itakura core, the paleoenvironment of Paleo-Tokyo Bay was estimated by using fossils of ostracoda and foraminifer. So we want to presume it too from different viewpoint by using bryozoan fossils. In total, 6 species belonging to 6 genera of bryozoans were identified. Most dominant species was Acanthodesia savartii. As a result, we found out that the paleoenvironment had warm weather, the bay was shallower than 30m and having seaweed bed. These results match with research by using fossils of ostracoda and foraminifera. By examining the fossils of bryozoans more details, we can detect about the paleoenvironment further.