A new Zealandia-wide seismic horizon naming scheme

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Strogen, D.P.; King, P.R. 2014 A new Zealandia-wide seismic horizon naming scheme. Lower Hutt, N.Z.: GNS Science. GNS Science report 2014/34 20 p.

Abstract: This report introduces a new Zealandia-wide seismic horizon naming scheme. It also explains the need for such a scheme to overcome incompatibilities between existing schemes and the difficulties in their application, both within the Taranaki Basin and elsewhere. Our new standardised horizon scheme has been adapted from an earlier version devised for the 4D Taranaki mapping project being undertaken by GNS Science as part of our core-funded research. The scheme uses a letter prefix (K, P, N) to demarcate horizons of Cretaceous, Paleogene and Neogene age respectively, which are individually numbered in ascending (younging) order in multiples of 5 or 10 within each of these major time periods. The main modification herein is the tying of these benchmark horizons to national biostratigraphic events (i.e. New Zealand stage boundaries), rather than tectono-stratigraphic events that might only occur locally within individual basins. The currently oldest horizon assigned within the Cretaceous is K40. This provides plenty of scope for naming any older horizons should they be mapped in future. The basal horizon for each of the Paleogene and Neogene intervals has been renumbered 00 rather than 10, as was the case previously (e.g. the base Paleocene is now P00 not P10). This minor revision is aimed at reducing confusion by removing any implication that Paleocene strata may be present beneath (i.e. there might be such strata beneath a horizon labelled P10, but not below one labelled P00). To accommodate previously-released reports from the 4D Taranaki project we present a translation from the immediate precursor GNS Science Taranaki naming scheme to the new scheme, which will henceforth be used for future outputs from Taranaki and other basins. (auth)