Biostratigraphy of Te Kumi-1 offshore well, north Taranaki

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Hayward, B.W.; Strong, C.P.; Mildenhall, D.C. 1993 Biostratigraphy of Te Kumi-1 offshore well, north Taranaki. Lower Hutt: Institute of Geological & Nuclear Sciences Institute of Geological & Nuclear Sciences science report 93/21 28 p.

Abstract: Te Kumi-1 offshore petroleum exploration well, located off north Taranaki, was drilled to a total depth of 3824 m during March and April 1988 by AMOCO New Zealand Exploration Ltd. Bottom-of-hole lies within rocks of the Porangan Stage (middle Eocene). Analysis of Foraminifera from 16 cuttings samples provides the following skeletal biostratigraphy: 800 m late Nukumaruan-Castlecliffian; 2065 m mid to late Opoitian; 2446 m early Lillburnian; 2671-2923 m Altonian; 3313 m early Waitakian; 3445-3511 m upper Whaingaroan; 3746-3790 Arnold Series, undifferentiated; 3820 m Porangan. A single palynological sample from 3823 m gave inconclusive age results, but indicated that the well did not reach Pakawau Group sediments. Sample spacing is too wide to identify any time gaps in the sequence. The Foraminifera indicate mid bathyal (1000-2000 m) depths from Porangan to Opoitian, shallowing to shelf depths by the late Nukumaruan-Castlecliffian. (auth)