New Zealand Journal of Marine and Freshwater Research abstracts

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UPPER TERTIARY ROCKS FROM THE CONTINENTAL SHELF AND SLOPE OFF SOUTHERN HAWKES BAY

K. B. Lewis

New Zealand Oceanographic Institute, Department of Scientific and Industrial Research, Wellington, New Zealand

Abstract Sixteen rock samples were collected from the continental shelf and slope between Napier and Cape Turnagain, southern Hawkes Bay, most coming from offshore anticlinal ridges. Nine of the samples have a foraminiferal fauna of Upper Miocene and Pliocene age. The remainder cannot be dated, but most are probably of similar age. The foraminiferal. faunas are considered to have lived at depths ranging down to at least 1600 m deeper than the depth from which they were collected. Thus, the post-depositional history of the samples includes tectonic uplift of similar magnitude since Upper Tertiary times. Because most of the samples arc very fine grained, unlike Recent sediments from ridges, it is suggested that the present regime of folding is largely post-Pliocene in age.

N.Z. Journal of Marine and Freshwater Research 8 (4) : 663-70.
(Received for publication 8 March 1974; revision received 3 May 1974)

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