“…As discussed previously, all potential sediment sources except for the Belt Supergroup, Neoproterozoic to Cambrian Brigham Group and coeval strata, Precambrian basement, and Mogollon Highlands, have Yavapai‐Mazatzal grains ranging in abundance from ~5% to 19%: 18% from the North American passive margin (Gehrels & Pecha, ; Malone et al, ; May et al, , ), 8% from Mesozoic eolianites (Dickinson & Gehrels, , ), 19% and 18% from the Paleozoic sandstones to the west and northern Colorado, respectively (Evans & Soreghan, ; Link et al, ; Nair et al, ; Siddoway & Gehrels, ), 5% from the Cordillera magmatic arc and batholiths (Laskowski et al, ), and 18% from Sevier foreland basin strata (May et al, , ). None of these sources can provide more than 20% Yavapai‐Mazatzal‐age zircons to the sample data set.…”