T.R. HaskellHaskell Exploration Services Ltd.Wellington, NZExploration work on petroleum exploration permits held by Asia Pacific Oil Sdn. Bhd. on and off Gisborne City on the east coast of New Zealand's North Island and offshore in the southeastern continental shelf, the Muriwai shelf, showed a marked contrast in their structural style.The former is a south-facing half graben involving an essentially complete basin section of Late Cretaceous to Recent sequence that can be accepted as part of the East Coast basin's convergent Hikurangi Margin. The latter comprises separate and superposed synclines developed in Neogene rocks that rest on a largely opaque seismic sequence representing the L...