Japan Geoscience Union Meeting 2015

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Symbol H (Human Geosciences) » H-QR Quaternary research

[H-QR23] Diachronic dynamics of human-environment interactions

Sun. May 24, 2015 6:15 PM - 7:30 PM Convention Hall (2F)

Convener:*Takahiro Miyauchi(Department of Earth Sciences, Graduate School of Science, Chiba University), Takashi AZUMA(National Institute of Advanced Industrial Science and Technology), Yoshinori MIYACHI(National Institute of Advanced Industrial Science and Technology)

6:15 PM - 7:30 PM

[HQR23-P07] The lower loam bed and eolian sand deposits found at Tomobe Hills, Middle Part of Ibaraki Prefecture

*Shinzou OOI1, Nobuo SAIRENJI2, Tadayasu SUTO3, Hisao ANDO4 (1.GSI, 2.Shirakata Elementary School, 3.Kasama City, 4.Ibaraki University)

Keywords:Tomobe Hills, Eolian sand deposit, HBP Tephra, Tomobe Formation, Pleistocene

The Pleistocene Hikita and Tomobe formations are distributed in the Urizura and Tomobe hills and the Kakioka Basin,the midwestern part of Ibaraki Prefecture. Their sedimentary age remains undefined. As several tephra layers from the lower loam bed and eolian sand deposits overlying the Tomobe Formation were found at the Tomobe Hills, we examined their correlation. Two tephras possibly correlative with "GoP" and "HBP", key tephra beds of the Tama Loam in the Kanto Plain region, respectively were included in the lower loam bed. This indicates the lower stratigraphic position for the Tomobe Formation than the Jizodo Formation (equivalent to MIS11), Shimosa Group.