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. 2018 May 15;9:1909. doi: 10.1038/s41467-018-04311-8

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© The Author(s) 2018

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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Fig. 1 — Stratigraphic column of the Chapel Island Formation showing the change in degree of sediment mixing. Block diagrams summarize the change in sedimentary fabric and intensity of bioturbation, revealing the establishment of a sediment mixed layer at the base of Cambrian Stage 2. M1 to M5 refers to the five members of the Chapel Island Formation (CIF). Scale is in meters