Abstract
Abstract Waipoua Basalt Formation is closely associated with coeval mid Miocene sediments of Waipoua Subgroup. The formation consists of lava flows (2–25 m thick), typically separated by layers of tephra (up to 2 m thick), and intruded by dike swarms in a zone extending 15 km north from Maunganui Bluff. Lava from both flows and dikes is a glomeroporphyritic plagioclase-olivine-augite basalt. In the Kaihu area Whatoro Breccia Member (new) is a breccia of assorted igneous Hthologies, mostly of Waipoua Basalt origin, in a tuffaceous matrix. Although eruption may have occurred in the dike-intruded zone, evidence suggests that the main volcanic centre lay a short distance offshore from Maunganui Bluff.
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