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. 2016 May 17;7:11500. doi: 10.1038/ncomms11500

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(a) Location of the North China, Yangtze and Tarim cratons. (b) Proterozoic outcrops within the North China craton—black box marks the Yanshan area. (c) Regional map of the Proterozoic outcrop within the Yanshan area, showing fossil localities. (d) Generalized Proterozoic stratigraphy in the Yanshan area (on the basis of the stratotype sections in Jixian), showing lithofacies, zircon U-Pb ages (on the basis of (refs ²⁰, ²¹, ²³, ²⁴) and references therein), and fossiliferous horizon.