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The Nature of Umsini Volcano Irian Jaya Indonesia
Mount Umsini ("Oemsini") is internationally listed as an active volcano in the Bird's Head Irian Jaya (New Guinea)/ The mountain occurs at the north end of the Arfak Mountains, a range consisting of tilted and presumably folded early Tertiary turbidite sequences and volcanoclastic rocks that were intruded by Early Oligocene gabbroic rocks. The morphology is characterized by NNW-striking, long, mountain ridges with parallel drainage and on the east slope of the range by dendritic patterns. We conclude from the absence of any volcanic activity, crater relicts and general morphology, and lithology, that Mount Umsini is not a volcano and that the actual name of the mountain is Umcen (pronounced "ounchen")
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