Reporoa Volcano on the North Island of New Zealand.
Only reported historic event was a phreatic (water-rich) eruption
in 1180 dated by tephrochronology.
The stamp below depicts the Champagne Pool.
Part of the Waiotapu geothermal area within the caldera.
It was issued by the Universal Mail, New Zealand Ltd.
An earlier version of the Champagne Pool is seen below (courtesy
Sheryll Oswald)
Next stamp was issued in 1993
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