Fig. 1: Paleogeographic and geological map of the study area.

a Simplified paleogeographic reconstruction for the Cryogenian nonglacial interlude (modified after ref. 9). Dashed rectangle indicates the possible location of Mongolia from ref. 9. b Geological map of the Zavkhan Terrane in western Mongolia with the inset showing tectonic terrane map of western Mongolia (modified after ref. 16 with permission from Elsevier). Fm – Formation. The studied section is denoted by the red star while previously studied sections are shown as yellow stars.