福島県いわき市四倉産新第三紀流紋岩のK-Ar年代値
1980 年 75 巻 8 号 p. 279-280
詳細
1980 年 75 巻 8 号 p. 279-280
K-Ar age is determined on the biotite in the rhyolite from lower member of the Neogene Tertiary. The obtained age of 13.5 m. y. is alightly younger than the expected geological time.
