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. 2020 Jun 2;10:8970. doi: 10.1038/s41598-020-65868-3

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© The Author(s) 2020

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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Linear Discriminant Analysis (LDA) of inorganic chemistry data for fossil melanosomes and sedimentary matrices. (a) Scatterplot of the LDA chemospace for the entire dataset with biplot (grey circle). Biplots show the most discriminating variables, i.e. those that contribute most to the separation among groups. (b–e) Panels highlighting the data for the Messel (b), Orsberg (c), Yanliao (d) and Jehol (e) biotas in the LDA plot in (a).