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. 2015 Aug 12;10(8):e0133330. doi: 10.1371/journal.pone.0133330

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Fig 1 — A. Overview of continental USA (copyright 2004 Jared Benedict, licensed under the Creative Commons Attribution-ShareAlike License) with inset. B. Uinta-Piceance Basin of Green River Formation in Utah and Colorado. Red dots mark locations where fossils were found, 1 = Old Mountain Site, 2 = Denson Site; the black line outlines former Lake Uinta.