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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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Seismic characteristics of late Paleogene sedimentary drifts. (a) A seismic line shows a central mound between markers ME and TE with internal upslope prograding configuration. High amplitude reflections (HARS) occur towards the top of the mound. A moderate to strong positive amplitude reflection is identified as the opal-A to opal-CT reaction front (yellow dotted horizon). We correlated seismic horizons in the drift to Pukaki-1 (Fig. 5a). (b) Subsidiary mound developed offshore of the central mound (Location marked by a box in Fig. 3a). It shows internal convex reflection pattern and a landward moat. High amplitude reflections are seen above the marker that is assigned an age of 36 Ma.