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. 2020 Jul 2;10:10851. doi: 10.1038/s41598-020-67467-8

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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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Age and internal morphology of RFs N1–N3. Layers are labeled with numbers. Left panel for each field presents the main profile (X), right panel the two side profiles (Y and Z). Note: layer 1 in side profiles of RF N3 is missing. It was unintentionally removed during our observation and sampling campaign when the field was cleared of fallow vegetation before excavation of the trench. Photos (1–20 August 2017), Leonor Rodrigues and Tobias Sprafke. (Ilustrations made with Adobe Illustrator).