Abstract
Abstract The causes of the large variations in the densities of sedimentary rocks from the Westport, Inangahua, and Murchison depressions include: the presence of cement (usually calcite); difference in source rock of sediments; and variation in the lithostatic load to which the sediments have been subjected. A density-depth curve is used to provide estimates of the maximum thickness of sediment. The Murchison, Inangahua, and Westport depressions have at least 3000 m, 1000—2000 m, and 300 m, respectively, of sediment overlying the Eocene Kaiata Formation.
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