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Wikipedia definition
1. Motonori MatuyamaMotonori Matuyama was a Japanese geophysicist who was the first to surmise that the Earth's magnetic field had undergone reversals in the past. The era of reversed polarity preceding the current Brunhes era of normal polarity is called the Matuyama reversed chron and the boundary between them is called the Brunhes–Matuyama reversal.
Read “Motonori Matuyama” on English Wikipedia
Read “松山基範” on Japanese Wikipedia
Read “Motonori Matuyama” on DBpedia

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