Nicholson, Uisdean Carter, Andrew Robinson, Paula Macdonald, David I. M. Eocene–recent evolution of the Colorado River Appendix 3: U–Pb ages of detrital zircons in the modern Colorado River (CR20) evolution;Colorado River;detrital zircons;CR;Eocene;Geology 2019-02-06
    https://geolsoc.figshare.com/articles/journal_contribution/Eocene_recent_evolution_of_the_Colorado_River/7679981
10.6084/m9.figshare.7679981.v1