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. 
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Ficure 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 palzozoic 
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. 
area on the southwest. 
