https://www.jstage.jst.go.jp/article/japt1933/66/3/66_3_311/_article
K-Ar and fission track ages of the Kt-1 Tuff in theMiocene marine sequence in the Tanagura area,...
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https://pam.wikipedia.org/wiki/Tanagura,_Fukushima?action=edit&redlink=1
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