on the Navajo Reservation. 



103 



Chelly sandstone and Shinarnmp conglomerate in relations 

 normal to the JMavajo Reservation. At the pass, however, the 

 usual wavy and serrate crest of the ridge disappears and its place 

 is taken by a disorderly array of massive blocks of sandstone and 

 limestone ; red or buff in general color, but in places painted 

 black by a thick coat of desert varnish. Except for a distance 

 of about one-fourth of a mile the sedimentary series is undis- 

 turbed ; the underlying Moenkopi is followed in regular ascend- 



Fig. 2. 



Fig. 2. Mule Ear Pass viewed from the south. The rock in the left fore- 

 ground is De Chelly sandstone and Shinarump Conglomerate; the valley is 

 cut in Chinle shales ; the massive rock walls in the right half of the picture, 

 including the two points of Mule Ear, are formed of La Plata sandstone. The 

 erratics cover the broken ridge in the extreme upper left-hand corner of the 

 view. 



ing order by De Chelly sandstone, Shinarump Conglomerate, 

 Chinle shales and the three members of the La Plata Group. 

 In ascending the ridge it is found that erratics are thickly 

 strewn over the slopes and extend into the valley carved from 

 the soft Chinle shales. Fragments and bowlders of granite, 

 granite gneiss, garnetiferous diorite, slates, phyllites, schists 

 and fossiliferous limestone are represented by numerous indi- 

 viduals. On the crest of the widened ridge and along its 

 upper flanks bowlders and blocks of these materials are found 

 in abundance. One granite bowlder three feet in diameter 



