DAVIS : THE GRAND CANYON OF THE COLORADO. 



109 



of one that we spent near the bottom of the canyon, which was un- 

 pleasantly warm. A brief report upon our trip has already been 

 published in the "American Journal of Science," for October, 1900. 



Figure 1. 



Route-map of Grand canyon district. The dotted belt represents the weak lower Triassic 

 and Permian strata separating the mesozoic area on the northeast from the palaeozoic 

 area on the southwest. The several blocked plateaus are separated by faults (con- 

 tinuous lines) or flexures (broken lines). The route followed is marked by a fine 

 broken line, with numbers to indicate dates of camps in May, 1900. F, Fredonia; 

 H, H, Hurricane ledge and fault; K, Kanab; M, Mt. Trumbull; P, Pipe spring; 

 Q, Toquerville; T, Toroweap valley; Y, recent lava mesa. Outline taken from 

 Dutton's Atlas. 





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