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. 2021 May 11;11:10021. doi: 10.1038/s41598-021-89472-1

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© The Author(s) 2021

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Stillatuberoolithus storrsi oogen. et oosp. nov. UCM 1139 (paratype). (a) EMPA elemental mapping of magnesium (Mg) through a thin section of eggshell (pictured beneath in cross-polarized light). Colour scale ranges from high (bright magenta) to low (dark magenta) concentration. Lowest concentration is in the mid-upper mammillary layer, with upper boundary distinctly visible (arrow). Pseudocolour was applied to the original grey scale image with Fire LUT in Image J (https://imagej.nih.gov/ij/), and adjustments were applied to the whole image ; (b) EBSD band contrast map (left) and IPF Y crystallographic orientation map (right) showing mammillary-continuous layer transition (black arrow) with rugged grain boundaries in the continuous layer. Note the node (white arrow) is crystallographically discontinuous from the underlying eggshell. Key indicates calcite crystal c-axis orientation; (c) Radial thin section in plane light displaying the boundary between the mammillary and continuous layers (arrow). Note rugged grain boundaries in the continuous layer.