This map of the area around Lake Brunner on the West Coast of the South Island outlines the extent of the impressive Kōtuku oilfield, discovered in 1900. The map shows both oil seeps and gas escapes, and it also indicates boreholes and areas recommended for further boring. Little came of the bores put down. The only New Zealand locality where drilling on seeps has been successful is the small-scale Moturoa oilfield, on the New Plymouth foreshore.
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Reference: Percy Morgan, 'The Geology of the Greymouth Subdivision'. New Zealand Geological Survey Bulletin 13 (1911): 146-147
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