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松尾の埋没木 ～火砕流で蒸し焼きになった巨木～
旧三重南小学校（現あかい屋根の郷）の校庭に保存されている木の幹は、近くの沢の谷底に埋まっていたものです。9万年前におきた阿蘇火山からの火砕流は山を越え、木々をなぎ倒して流れ下りました。なぎ倒された木は火砕流に埋められ、蒸し焼きにされました。そのため木の表面は黒く炭になっています。
