Soils and geology of some hydrothermal eruptions in the Waiotapu district

During a detailed soil survey of the Waiotapu district, five deposits laid down by hydrothermal eruptions in the vicinity of Maungakakaramea were identified. These have been named after the lakes that now occupy the five craters. The eruptions were probably triggered by tectonic movements, and derived their energy from the flashing of hot water, which had hydrothermally altered the rocks before they were ejected. The soils and their properties are described in detail, accompanied by chemical analyses.