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. 2019 Jul 12;9:10125. doi: 10.1038/s41598-019-46253-1

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Study area map. Map showing the South Island of New Zealand, Campbell Plateau, sub-Tropical Front (STF)⁷², Antarctic Circumpolar Current (ACC), Pacific Deep Western Boundary Current (DWBC)^73,74 and a modern cyclonic circulation (marked by blue arrows) in the Great South Basin (GSB) and the Bounty Trough (BT). Canterbury drifts (CD)⁵⁹ and DWBC drifts²⁸ are shown. Time thickness (two-way travel time in seconds) map of the mid-Eocene to Late Eocene interval in the GSB shows the NNE–SSW striking elongate sedimentary drift. Subsidiary drifts were deposited on the eastern offshore side of the main mound. Boreholes of ODP Leg 181 (1119, 1120 and 1122), IODP expedition 317 (U1352 and U1354), DSDP Leg 29 (275 and 276), Leg 90 (594) and oil exploration wells (Pukaki-1 and Pakaha-1) are marked.