Activity of the early Pleistocene erupted
basaltic
andesite or
effusive basalt. The volcano was covered by enormous
lava flows from 600,000 to 300,000 years ago. It has seen activity ranging from
phreatic eruptions to
ash flows. The volcano is topped by a wide crater marked by sharp and precipitous walls. It has six
hot springs. Maasok near the crater; Marafil in the northwest; Manaring, north-northeast; San Jose, north-northeast; Kabinlangan, northwest and Paminta, north-northwest. == Eruptive activity ==