Palynostratigraphic analysis of a measured section through the Karekare, Owhena and Whangai formations (Upper Cretaceous) at Waitahaia River - ''Owhena Stream'' (Raukumara Peninsula)

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Schioler, P.; Crampton, J.S.; King, P.R. 2000 Palynostratigraphic analysis of a measured section through the Karekare, Owhena and Whangai formations (Upper Cretaceous) at Waitahaia River - ''Owhena Stream'' (Raukumara Peninsula). Lower Hutt: Institute of Geological & Nuclear Sciences. Institute of Geological & Nuclear Sciences science report 2000/31 16 p.

Abstract: This report summarises the results of palynological analysis of samples from a measured section through the marine Karekare. Owhena and Whangai formations (Upper Cretaceous) exposed in the banks of the Waitahaia River, Raukumara Peninsula, North Island, New Zealand. The base of the section is approximately 200 m upstream of the mouth of ''Owhena Stream'' (informal name) and extends to 100 m below ''Owhena Stream'' mouth. Section grid co-ordinates on NZMS 260 series 1:50000 topographical map sheet Y16 (Tauwhareparae) are Y16/45953649-46223647. Sampling was carried out by the authors on the 16th January 1999; samples were analysed through August 2000. The primary aim of the project was to date the transition from the fine-grained sandstones of the Owhena Formation to the silty mudstones of the Whangai Formation. The area has been mapped previously by Phillips (1985) and Mazengarb et al. (1991), and general stratigraphic relationships are summarised in Field and Uruski et al. (1997). The biostratigraphic dating is based on dinoflagellatea due to the scarcity of other useful marine fossil groups in the succession. (auth)