P. C. Froggatt, C.J.N. Wilson, G.P.L. Walker; Orientation of logs in the Taupo Ignimbrite as an indicator of flow direction and vent position. Geology ; 9 (3): 109–111. doi: https://doi.org/10.1130/0091-7613(1981)9<109:OOLITT>2.0.CO;2
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The Taupo Ignimbrite is an unwelded rhyolitic ignimbrite that originated about 1,820 yr ago from an eruptive vent within Lake Taupo in the Taupo Volcanic Zone, New Zealand. This ignimbrite is rich in carbonized plant matter, including many logs. The logs lie subhorizontally throughout all levels of the ignimbrite but are especially common in the lower half. Regionally the logs show a strong radial orientation, indicating flow directions and position of the source vent. Log orientation is thus a reliable indicator of vent position.