DUTTOH.] 



GRAND CANON AT THE TOROWEAP. 



113 



Fig. 9. — The l>i ink of the Inner (ior^o at tho foot of the Toroweap, looking west. 



sandstones a little more than 250 feet thick, which form everywhere a 

 vertical plinth or frieze. They are very adamantine in texture, and one 

 of the members, about 160 feet thick, is in every exposure seen to be 

 uniformly cross-bedded. Under the cross-bedded sandstone is a mass 

 of thinly bedded and almost shaly sandstones, having- an aggregate 

 thickness very closely approximating to 1,000 feet. They are of an in- 

 tensely brilliant red color, but are, in greatest part, covered with a 

 heavy talus of imperishable cherty nodules, fragments of the cross- 

 bedded sandstones, and spalls of limestone shot down from above. The 

 color of these is pale gray, with occasionally a yellowish or creamy tinge. 

 8 g A 



