In January 1970, after a two-year period of inactivity, Ulawun volcano, on the north coast of New Britain, erupted. Ulawun is a stratovolcano built of basaltic and low-silica andesite lava flows and pyroclastic rocks, most of which were erupted from a central vent; many of the lavas were partly fragmented during flow, and some unsorted elastics mav have been deposited by nuees ardentes.

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