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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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(a) Paleogeography of the United States during the Campanian (after Roberts and Kirschbaum, 1995¹⁷; image generated with Adobe Illustrator CS4, version 14.0.0—see https://www.adobe.com/products/illustrator.html for recent versions). Star denotes location of Grand Staircase-Escalante National Monument. (b) Geologic map of GSENM with Cretaceous Kaiparowits Formation highlighted (after Foster et al.¹; image generated with Adobe Illustrator CS4, version 14.0.0—see https://www.adobe.com/products/illustrator.html for recent versions). Areas shaded white indicate areas of the monument lost to the 2017 boundary modifications of White House Proclamation 6920.