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This is an update request for the document Matuyama-Brunhes boundary age constrained by SHRIMP U-Pb zircon dating of a widespread tephra by Suganuma Yusuke, Okada Makoto, Horie Kenji, Kaiden Hiroshi, Takehara Mami, Senda Ryoko, Kimura Jun-Ichi, Kawamura Kenji, Kazaoka Osamu and Martin J. Head

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