Philip R. Kyle, Diane Seward; Dispersed rhyolitic tephra from New Zealand in deep-sea sediments of the Southern Ocean. Geology ; 12 (8): 487–490. doi: https://doi.org/10.1130/0091-7613(1984)12<487:DRTFNZ>2.0.CO;2
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Dispersed rhyolitic tephra in deep-sea piston cores collected from the South Pacific sector of the Southern Ocean have previously been considered to originate from the Balleny Islands, Antarctica. Chemical composition of the materials suggests that a source in New Zealand is more likely. A strong correlation exists between paleomagnetically determined ages for these deep-sea tephra layers and fission-track ages determined on volcanic glasses and zircons from tephra sequences in Wanganui Basin and Cape Kidnappers, New Zealand. The correlation suggests that the tephra extend more than 5000 km east and south of New Zealand.