This diagram shows the main features of the Taranaki Basin and its 7-kilometre-deep sediments. Many of Taranaki’s oil and gas reservoirs are found along the fault lines of the region. The Taranaki graben is the large block of crust that has dropped down between the Cape Egmont and Taranaki faults.
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Source: T. R. Haskell and J. A. Palmer, An outline geology of Taranaki. New Plymouth: Dept. of Lands and Survey, 1984.