DAVIS: THE GRAND CANYON OF THE COLORADO. 201 



EXPLANATION OF PLATES. 



PLATE 1. 



General view of the Colorado Canyon, looking about north from O'Neill's point to 

 the Kaibab plateau. Copyright photograph by Detroit Photographic Co. 



PLATE 2. 



A. A shallow valley floor in the Coconino forest, south of the Colorado canyon ; 

 a hill and drying-ground of the farmer ant in the foreground. Photo- 

 graph by Dr. H. E. Gregory. 



R. A boulder of Shinarump sandstone perched on a pedestal of weak Permian 

 shales at the base of the Shinarump bench, beneath Vermilion cliffs, 

 Paria plateau, southwest of Lee's Ferry. Photograph by Dr. H. E. Gregory. 



VOL. xxxviii. — no. 4. 



