Geoscience reports of Shimane University

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Geoscience reports of Shimane University 12
1993-08-30 発行

松江市西川津遺跡のアカホヤ火山灰層

New occurrences of the K-Ah(Akahoya) Tephra from the Nishikawatsu Historic Site, Matsue City
Nakamura, Tadashi
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Description
The Akahoya(K-Ah)Tephra was erupted 6300 Y.B.P.from Kikai Island in Kyushu,and is one of the most widespread marker-tephras in Japan.lt has recently been identified at three sites near Matsue city.These sites are distributed in former wet-land along the eastern margin of Lake Shinji.Each volcanic ash layer is less than 2cm thick,and is intercalated with brackish silt.Volcanic glass in each layer was analysed by EPMA,and is chemically identicalto that in K-Ah Tephra from elsewhere.
NCID
AA11455176