The Quaternary Research (Daiyonki-Kenkyu)

Special Issue on the Symposium “History and geo-history in Tsugaru : from archaeological sites” (Part 2)

Natural formation processes of the Nakayama site (late to final stage of Jomon period) in Akita Prefecture, Northern Japan : a preliminary report

Tsubasa Kamei, Naoto Koiwa, Nobuhiko Kamijo

2014 Volume 53 Issue 5 Pages 241-248
Published: October 01, 2014
Released on J-STAGE: July 23, 2015

DOIhttps://doi.org/10.4116/jaqua.53.241

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The geology of the Tsugaru district and the raw materials used to make Jomon pots

Masatoshi Shiba

2014 Volume 53 Issue 5 Pages 249-257
Published: October 01, 2014
Released on J-STAGE: July 23, 2015

DOIhttps://doi.org/10.4116/jaqua.53.249

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The chemical composition of glass shards and clay minerals contained in Jomon pots excavated in Aomori Prefecture, northeastern Japan, was analyzed by means of an electron probe micro-analyzer (EPMA). The analysis value of glass shards of these pots indicates that these shards were derived from the Kanagi Tuff of late Miocene, the Obirakiyama Tuff of Pliocene, the Toya Tephra and the Towada-Hachinohe Tephra of late Pleistocene. These pots are generally composed of glass shards from a single tephra. This means that these glass shards were collected from an original tephra bed. Jomon pots con-taining glass shards from the Obirakiyama Tuff are found in the Shimokita district, the northern-most part of Aomori Prefecture, although the Obirakiyama Tuff is not distributed in that area. Therefore, it can be assumed that the pots were manufactured in the Tsugaru district and then transported to the Shimokita district. Clay minerals of the matrix of all these pots consist of kaolinite or halloysite or kaolinite/smectite interstratified mineral. Reflecting the geological background of the producing area of each item of pottery, small amounts of clay minerals such as illite, chlorite, illite/smectite interstratified minerals and corrensite coexist with the kaolin minerals.

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Short Article

Discovery of a tsunami boulder along the coast of Shimoda, Shizuoka, Central Japan

Akihisa Kitamura, Yoko Ohashi, Yousuke Miyairi, Yusuke Yokoyama, Toshi ...

2014 Volume 53 Issue 5 Pages 259-264
Published: October 01, 2014
Released on J-STAGE: July 23, 2015

DOIhttps://doi.org/10.4116/jaqua.53.259

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We found a boulder to which emerged sessile assemblages cling, 3.4×2.5×2.5m in size and estimated at 32 tons, on a wave-cut bench at Shimoda, Shizuoka, Central Japan. The emerged sessile assemblages are distributed at 0.7-2.2m above mean sea-level, and consist mainly of small barnacles, oysters, and polychaetes. Based on AMS ¹⁴C dating (AD 1720-1950) and the ecology of the emerged sessile assemblages, we conclude that the boulder was rolled to emergence by a tsunami associated with the AD 1854 Ansei-Tokai earthquake.

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Lecture

Tephrology (part 5) : Major element composition of volcanic glass shards and tephra beds correlation

Yoshitaka Nagahashi, Kyoko S. Kataoka

2014 Volume 53 Issue 5 Pages 265-270
Published: October 01, 2014
Released on J-STAGE: July 23, 2015

DOIhttps://doi.org/10.4116/jaqua.53.265

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