Raine, J.I.; Beu, A.G.; Boyes, A.F.; Campbell, H.J.; Cooper, R.A.; Crampton, J.S.; Crundwell, M.P.; Hollis, C.J.; Morgans, H.E.G. 2015 Revised calibration of the New Zealand Geological Timescale : NZGT2015/1. Lower Hutt, N.Z.: GNS Science. GNS Science report 2012/39 53 p.
Abstract: The criteria used to establish the age ranges of New Zealand stages (and some substages) for late Paleozoic to Cenozoic time are reviewed and the ages re-calibrated to the 2014 International Geological Timescale, taking into account recent stratigraphic data from New Zealand studies. This updated New Zealand timescale is referred to as NZGT2015/1. The age calibration is compared to the comprehensive review of 2004, a Cretaceous-Cenozoic review in 2010, and an interim calibration in 2012. In the Cretaceous and Cenozoic, boundary age changes since 2010 are most significant in stages of the Raukumara to Arnold Series (Cenomanian to late Eocene), but several stages of the Landon to Wanganui Series (Oligocene to Pliocene) are also affected. Calibration of the Permian to Jurassic New Zealand timescale comprises the first such general review since 2004: boundary ages of nearly all stages are revised, as well as definitions of the upper and middle Ohauan and upper Heterian substages (Upper Jurassic). Australasian stages are used in New Zealand for the Cambrian and Ordovician periods, but international units for the Silurian to Carboniferous: for these we report age calibration based on 2012 and 2014 international compilations. (auth)
