638 



C. L. DAKE 



nature of these beds is best brought out by the illustrations. 

 Figure 3 shows a sheer wall of the Vermilion CHff; Figure 4 illus- 

 trates one of the characteristic arches developed by the curved 

 lamination of the same formation, and, in addition, shows the over- 

 lying thin, shaly red sandstones 

 of the supposed Todilto. In 

 Figure 5 the same thin-bedded 

 red sandstone i's shown at the 

 base, capped by a remarkable 

 wall of the upper, or Gray Cliff, 

 formation. In the foreground 

 of Figure 6 is shown a low cliff 

 of the Moenkopi capped with 

 Shinarump conglomerate ; 

 above that, slopes exposing 500 

 to 600 feet of Dolores or Chinle 

 shales (upper Shinarump shale) ; 

 in the middle distance massive 

 cliffs of the lower La Plata or 

 Vermilion (Wingate ?) ; next 

 above are slightly thinner beds 

 capping the chff (probably To- 

 dilto) ; and finally in the back- 

 ground the amazing domes of 

 the upper La Plata or Gray 

 Cliif (Navajo ?) , which give the 

 name of Capitol Wash to the 

 canyon. Figure 7 also shows 

 the three divisions of the La 

 Plata here, the Vermihon Cliff 

 below (the sheer wall) , then the 

 more shaly beds, and finally the Gray Chff sandstone above with 

 its characteristic domes. 



Near the base of the Flaming Gorge at this point are also 

 massive tan sandstones identical with the La Plata (Figs. 8, 9, 10) 

 and only distinguished from it by their position well above both 

 divisions of the La Plata, as just described. In Water Pocket 



Fig. 3. — Cliff of basal La Plata sand- 

 stone (Vermilion Cliff), in Mule Twist 

 Canyon, Water Pocket Flexure, near 

 Henry Mountains, Utah. (Vertical lines 

 are not bedding, but probably water 

 streaking.) 



