Abstract
Abstract New biostratigraphic evidence confirms the existence of a major fault, the Manganui Fault, within Triassic-Jurassic Murihiku Supergroup rocks in the Manganui Valley, between Awakino and Paparahia (southwest Auckland Province, North Island). The Manganui Fault is interpreted as a steeply dipping fault with a minimum apparent vertical throw of c. 5500 m. There is some indirect evidence to suggest possible strike-slip activity. Timing of the last major fault movement is inferred to be pre-Oligocene. The Manganui Fault is significant because of its age, magnitude and regional context. It is considered to be a segment of a much more continuous feature, the Taharoa Fault, along which there are significant mid-Cenozoic andesitic volcanics. Several magnetic anomalies along the line of the Manganui Fault may represent buried volcanics of comparable composition and relationship.
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