64 



C. L. DAKE 



provisionally correlated with the Red wall limestone. The cross- 

 bedded sandstone (member i) resembles very closely the Coconino. 

 (Cf. Figs. 2 and 3 of this paper with Plates XXIX A and B, 

 U.S. Geol. Surv., Bull. 6ij, which illustrate the Coconino in Wal- 

 nut Canyon, Arizona.) The red and yellowish-gray sandy shales 

 of number four rest on the slightly eroded surface of the limestone 

 (member 3) with a very sparing development of conglomerate at 

 the contact. The shales are gray at the base, but grade upward 



Fig. 3. — Cross-bedding in Coconino(?) sandstone, same locality as Fig. 2. 

 by Zoller. 



Photo 



irregularly into the typical red sandy shales of the Moenkopi, 

 which are in turn overlain, again with unconformity (Fig. 4), by the 

 coarse sandstone and conglomerate of the Shinarump (restricted), 

 and this is followed by typical Dolores and La Plata. 



At this point the unconformity is not very pronounced. About 

 two miles northwest, however, near the south end of Wagon Box 

 Mesa, a large mesa capped with Shinarump, the deeper valleys show 

 red shale grading down through gray sandy shale into coarse sandy 

 conglomerate. The conglomerate consists of pebbles of chert and 

 limestone in a sand matrix, and rests directly on gray, cross-bedded 

 sandstone. At this point the limestone seems to have been removed 

 by the pre-Moenkopi erosion. Here, at the south end of the Wagon 



