Waitomokia is a volcano in the Auckland volcanic field. Waitomokia's 600 m wide tuff crater contained three small scoria cones up to 20 m high, one with a crater, which were quarried in the 1950s. The volcano erupted an estimated 20,300 years ago, based on volcanic ash samples found at Pūkaki Lagoon. The volcano consisted of an elliptical explosion crate…Waitomokia is a volcano in the Auckland volcanic field. Waitomokia's 600 m wide tuff crater contained three small scoria cones up to 20 m high, one with a crater, which were quarried in the 1950s. The volcano erupted an estimated 20,300 years ago, based on volcanic ash samples found at Pūkaki Lagoon. The volcano consisted of an elliptical explosion crater, with three small cones surrounded by a 15-25 metre tuff ring. The cones, each approximately 30 metres in height, were produced by explosive eruptions from three vents in the centre of the crater. The two eastern cones were conical, while the south-western peak was a spatter cone with an 18-metre deep crater. After the initial eruptions, the crater formed a freshwater swamp.
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