Park, Y., N.L. Swanson-Hysell, S.A. MacLennan, A.C. Maloof, M. Gebreslassie, M.M. Tremblay, B. Schoene, et al. 2020. “The Lead-up to the Sturtian Snowball Earth: Neoproterozoic Chemostratigraphy Time-Calibrated by the Tambien Group of Ethiopia”. Bulletin of the Geological Society of America 132: 1119-49. doi:10.1130/B35178.1.