Little Colorado Valley, Arizona. 



495 



the Government suspension bridge. The Moencopie forms 

 the surface over thirty or forty square miles at the base of 

 Coconino Point and lines the Little Colorado and its western 

 tributaries throughout the greater portion of their courses in 

 this area. The Shinarump conglomerate is exposed as a con- 

 tinuous stratum or as detached mesas on the west side of the 

 Little Colorado, and forms the higher cliffs and the tops of 

 canyon walls along that stream. Patches of upper Triassic 



Fig. 2. 



Fig. 2. View looking southwest across the Little Colorado canyon from 

 a point about fire miles below Tanner's Crossing. The bottom of the west 

 canyon wall is formed of Kaibab limestone, the top is a basalt flow. In the 

 immediate foreground and in the middle distance are buttes composed of 

 shales of the Moencopie formation capped by Shinarump conglomerate.. 

 Coconino Point is seen in the background. 



shales, outliers of widespread exposures east of the river, 

 overlie the Shinarump conglomerate between Black Point 

 and Warner Wash. 



The stratigraphy of the Little Colorado Valley was discussed 

 by Lester F. Ward in connection with a report on the Older 

 Mesozoic Flora of Arizona.* In this report is included a sec- 

 tion of the east wall of the Little Colorado canyon five or six 



* U. S. Geol. Survey, Monograph XL VIII, 1905. 



