Journal article

Strontium isotope dating of the New Zealand Oligocene

CS Nelson, D Lee, P Maxwell, R Maas, PJJ Kamp, S Cooke

NEW ZEALAND JOURNAL OF GEOLOGY AND GEOPHYSICS | SIR PUBLISHING | Published : 2004

Abstract

One of the least well resolved portions of the New Zealand Cenozoic time-scale is that centred on and about the Oligocene Epoch, internationally regarded as spanning c. 10 m.y. from 33.7 to 23.8 Ma. We have determined the 87Sr/86Sr ratios and derived absolute ages for 77 macrofossil samples collected from several biostratigraphically dated mid-Tertiary sections in the South Auckland (North Island) and North Otago/South Canterbury (South Island) regions. While the site-specific stratigraphic significance of our ages remains to be assessed, we present them here to foster wider consideration and discussion in relation to evolving absolute age schemes for the New Zealand Oligocene biostratigraph..

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