Tauanui is a 351 m (1,152 ft) high basaltic scoria cone in the Kaikohe-Bay of Islands volcanic field in New Zealand. It is the youngest volcano of the southern part of the field, having erupted around 60,000 years ago, and also the southernmost of the group. South east of the scoria cone is Lake Tauanui. To the north west of Tauanui is a smaller scoria cone, Hangunui Pā. To their north are the rhyolitic Putahi and the andersitic Tarahi volcanoes.
"In the last half-million years, 12 small basalt volcanoes have erupted in the southern part of the field (Smith
et al. 1993), forming a cluster of scoria cones around Kaikohe. Te Puke volcano erupted in the hills
behind Waitangi 100 000 years ago, forming three small cones and a spreading flow that now underlies
Waitangi golf course and treaty grounds. The youngest volcano is Tauanui, 10 km south of Kaikohe, which
60 000 years ago produced a high scoria cone and a lava flow that flowed 19 km down the Taheke Valley
towards the Hokianga Harbour. The field includes a small rhyolite dome (Putahi), overlooking Lake
Omapere. The field should still be considered dormant, and not extinct."
"Lake Taupō, in the centre of New Zealand's North Island, fills the caldera of the Taupō Volcano, a large rhyolitic supervolcano. This huge volcano has produced two of the world's most powerful eruptions in geologically recent times.
The volcano is in the Taupō Volcanic Zone within the Taupō Rift, a region of rift volcanic activity that extends from Ruapehu in the south, through the Taupō and Rotorua districts, to Whakaari / White Island, in the Bay of Plenty. "
Te Ahuahu is a 373 m (1,224 ft) high andesitic basaltic scoria cone to the east of Lake Ōmāpere, in the Kaikohe-Bay of Islands volcanic field in New Zealand.
"In the last half-million years, 12 small basalt volcanoes have erupted in the southern part of the field (Smith
et al. 1993), forming a cluster of scoria cones around Kaikohe. Te Puke volcano erupted in the hills
behind Waitangi 100 000 years ago, forming three small cones and a spreading flow that now underlies
Waitangi golf course and treaty grounds. The youngest volcano is Tauanui, 10 km south of Kaikohe, which
60 000 years ago produced a high scoria cone and a lava flow that flowed 19 km down the Taheke Valley
towards the Hokianga Harbour. The field includes a small rhyolite dome (Putahi), overlooking Lake
Omapere. The field should still be considered dormant, and not extinct."
"Te Kawa is the only Alexandra Volcanic with a crater remaining. Outcrops of coarse tuff and lapilli tuff are on the north and northeast sides of the crater and basalt boulders with augite megacrysts in the crater."
"Te Puke is a 136 metres (446 ft) high group of basaltic scoria cones, in the Kaikohe-Bay of Islands volcanic field in Northland, New Zealand. It is the easternmost volcano of the field, being located near Waitangi. The three or four small, cratered cones are in a southwest–northeast alignment. The last eruption was 1300 to 1800 years ago."
"Ruru, Maungakawa, Te Tāpui – These three
symmetrical cones are about 500m high, lie
in a distinct line and erupted about 6 MYA.
Deeply eroded andesitic boulders left from
lava flows are strewn over all three cones."
"Mount Tongariro is part of the Tongariro volcanic centre, which consists of four massifs made of andesite: Tongariro, Kakaramea-Tihia Massif, Pihanga, and Ruapehu at the southern end of the North Island Volcanic Plateau. The andesitic eruptions formed Tongariro, a steep stratovolcano, reaching a height of 1,978 m (6,490 ft). Tongariro is composed of layers of both lava and tephra and the eruptions that built the current stratovolcano commenced about 275,000 years ago.
Tongariro consists of at least 12 cones. Ngauruhoe, is geologically a cone of Tongariro. It is also the most active vent, having erupted more than 70 times since 1839, the last episode in 1973 to 1975."
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