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A red-clay core from north of New Zealand contains a 21cm-thick layer of the 340thousand-year old Rangitawa ash. Uranium and thorium isotope measurements on this core show that ash continuously contributes to sediments overlying the ash layer, ranging from ~58% immediately above the ash to ~8% at the core top. Rather than from an upward bioturbation or subsequent volcanic eruptions, the ash in sediments...
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