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. 2020 Feb 7;10:2176. doi: 10.1038/s41598-020-58986-5

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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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Changes in the diversity of molluscan assemblages during the Late Cretaceous-Eocene interval along the Gulf Coastal Plain. Raw species richness (a1), generic richness (b1), and functional richness (c1) of faunal samples. Subsampled species-level richness (a2), genus-level richness (b2), and functional richness (c2) using the SQS method¹⁷. Solid black line is the median, the top and bottom of the shaded area corresponds to the first and third quartiles, and the vertical lines represent the lowest and highest datum within 1.5 times of the interquartile range. Points outside of these lines are outliers. The Late Cretaceous and early Cenozoic hyperthermal events discussed in the text are highlighted by vertical grey bars: LM = Latest Maastrichtian, PETM = Paleocene/Eocene Thermal Maximum, ELMO = Eocene Thermal Maximum 2, MECO = Middle Eocene Climatic Optimum. The climax of the early Eocene long-term warming trend is shown by a horizontal bar, i.e., the Early Eocene Climatic Optimum (EECO). Abbreviations: Ma. = Maastrichtian, Cret. = Cretaceous, Dan. = Danian, S. = Selandian, Th. = Thanetian, Lutet. = Lutetian, Bar. = Bartonian, Pria. = Priabonian. Note: samples with <50 specimens were excluded from the analysis. The number of samples in each time interval is shown in Table S1.