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Sediments of the Western Shelf, North Island, New Zealand
McDougall, J.C.; Brodie, J.W. (1967). Sediments of the Western Shelf, North Island, New Zealand. NIWA Biodiversity Memoir, 40. New Zealand Oceanographic Institute: [s.l.]. 7-56 pp.
Deel van: New Zealand Oceanographic Institute Memoir. New Zealand Department of Scientific and Industrial Research: Wellington. ISSN 0083-7903
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  • McDougall, J.C.
  • Brodie, J.W.
Abstract
    Sediments at the surface of the western shelf between Kaipara and Wanganui can be separated into zones in each of which one grain size is dominant. For the shelf north of Cape Egmont an Inner Very Fine Sand Zone extending out to 25 fm is succeeded by a Fine Sand Zone out to 50 fm, then by an Outer Very Fine Sand Zone to the shelf edge. South and west of Cape Egmont an extensive Mud Zone occupies most of the shelf except an inshore area, south of Cape Egmont, in which sediments possessing a coarser dominant grade are found. The available sediment for deposition at present is mud and the coarser grades present offshore are relict from earlier sedimentary phases of late Quaternary times. The pattern of distribution of titano-magnetite on the shelf suggests that it is not due to primary volcanic emplacement of the material.
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