Purchas Hill (also Te Tauoma) is one of the volcanoes in the Auckland Volcanic Field. It was a twin-cratered scoria cone around 50 m high, located north of Mount Wellington, before it was quarried away. The scoria cone sat in the middle of its large explosion crater with surrounding tuff ring. It was erupted about 10,000 yrs ago, shortly before the eruption of its larger neighbour, Mt Wellington.