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. 2018 Oct 1;9:4007. doi: 10.1038/s41467-018-06472-y

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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. 4 — TEM observations and statistical analyses of magnetofossil morphologies for three typical PETM samples from ODP Hole 1263C. a–c Bright-field TEM images. Scale bars in a and b, c are 100 and 200 nm, respectively. The arrow in c indicates a needle-shaped giant magnetofossil crystal. d–f Length–axial ratio (width/length) diagrams for magnetofossil crystals measured from the TEM images. Magnetofossil morphologies are categorized into three main groups: isotropic or nearly isotropic octahedral and cubo-octahedral crystals (orange circles), elongated crystals and prisms (green squares), and bullet-shaped (blue triangles) crystals. The number of counted magnetofossil crystals is shown. Histograms of g–i length and j–l axial ratio for magnetofossils excluding bullet-shaped crystals. m Cumulative probability of length of magnetofossils excluding bullet-shaped crystals for the three samples with Kolmogorov–Smirnov test results. Box-whisker plots of n length and o axial ratio of magnetofossils excluding bullet-shaped crystals. The samples are the same as in Fig. 2. (a, d, g, j), (b, e, h, k) and (c, f, i, l) are for PETM onset, rising and peak samples, respectively