[Mile-marker 33]
About 2½ miles below the checking station, we pass on the left the basal
sandstone of the Burro Canyon Formation resting on the Morrison
Formation, as shown in the lower left of figure 24. Just beyond we may
look up the hill to the left and see the 40-foot basal conglomerate of
the Dakota Sandstone resting unconformably on an old erosion surface
atop the Burro Canyon Formation.