C. M. Dehler, S. M. Porter und J. M. Timmons: The Neoproterozoic Earth system revealed from the Chuar Group of Grand Canyon. In: J. M. Timmons und Karl E. Karlstrom (Hrsg.): Grand Canyon Geology: Two Billion Years of Earth's History. Special Paper no. 489. Geological Society of America, Boulder, Colorado 2012, S.49–72, doi:10.1130/2012.2489(03).
Karl E. Karlstrom u. a.: Cambrian Sauk transgression in the Grand Canyon region redefined by detrital zircons. In: Nature Geoscience. Band11(6), 2018, S.438–443, doi:10.1038/s41561-018-0131-7.
Karl E. Karlstrom u. a.: Redefining the Tonto Group of Grand Canyon and recalibrating the Cambrian time scale. In: Geology. Band48(5), 2020, S.425–430, doi:10.1130/G46755.1.