RECONNAISSANCE IN COLORADO AND UTAH 649 
pahegre Plateau and indeed all of western Colorado, and that they were 
in some places entirely removed by the erosion under discussion, 
but this view is not yet supported by enough evidence to warrant a 
positive assertion. 
Fic. 3.—A remnant of upper La Plata sandstone in Dry Valley, Utah. The 
lower massive sandstone is zone generally characterized by alcoves. ‘The weathering 
forms shown in cap of hill are very characteristic. 
TRIASSIC FORMATIONS 
Immediately below the White Cliff sandstone of the Plateau 
country comes another wonderful formation named by Powell the . 
Vermilion Cliff sandstone (31) which has been recognized by Gil- 
bert, Dutton, and other explorers of the region. Its continuity from 
the Uinta Mountains to the Vermilion Cliff, which forms the next 
great step below the White Cliff, facing the Grand Canyon of the 
