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. 2017 Jun 30;7:4406. doi: 10.1038/s41598-017-04514-x

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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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Locality and stratigraphic position of the alpine specimens of Eusaurosphargis dalsassoi (PIMUZ A/III 4380 and holotype specimen BES SC 390). (a) Map showing the Ducanfurgga locality relative to the World Heritage vertebrate site of Monte San Giorgio. (b) Correlation of the Middle Triassic section at Ducanfurgga (Upper Austroalpine Silvretta Nappe, south-eastern Switzerland) with that of (c) Monte San Giorgio (southern Alps, southern Switzerland). Reproduced from Fig. 1 of Fraser and Furrer (2013)³, with permission of the Swiss Geological Society. Relevant ages according to U-Pb zircon dating of volcaniclastic layers are 240.91 ± 0.26 Ma¹⁹ (1*), 239.89 ± 0.21 Ma¹⁹ (2*), 242.1 ± 0.6 Ma⁵⁵ (3*), 241.07 ± 0.13 Ma²⁰ (4*), 240.63 ± 0.13 Ma²⁰ (5*), and 239.51 ± 0.15 Ma²⁰ (6*).