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. 2017 Aug 23;7:8310. doi: 10.1038/s41598-017-08234-0

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© The Author(s) 2017

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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Comparison of the carbon isotope compositions of leaves of the fossil conifer Frenelopsis (δ¹³C_leaf) obtained for each studied episode with the evolution of the carbon isotope composition of atmospheric CO₂ (δ¹³C_CO2) throughout the Cretaceous estimated by Barral et al.¹⁶. Envelopes and bar errors correspond to ±1σ.