Application of a recently developed method of oriented drill coring to accumulative tephra layers: identification of the Matuyama–Brunhes geomagnetic reversal in Akan caldera-formi... by Takeshi Hasegawa, Chie Kusu, Makoto Okada, Aoi Hiratsuka, Kuniaki Nishiki, Yuki Sato, Masaru Koshigai, Takuya Matsuzaki, Yuhji Yamamoto

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