DAVIS: THE PLATEAU PROVINCE OF UTAH AND ARIZONA, 31 
trict was plainly enough not one to tempt exploration in midsummer, 
but as it all lay within ten miles of Virgin river it might be comfortably 
examined in the spring or fall months. It will be briefly described by 
Messrs. Huntington and Goldthwait, but it would repay much more 
elaborate treatment than they were able to give it. 
The Hurricane ledge near Antelope probably owes a good part of its 
height to modern movement on or near the plane of an ancient fault. 
The same statement may be made with more confidence of the point 
a mile south of Virgin canyon where my party descended the ledge in 
1900, and of the point three miles north of the same canyon where we 
came down the wagon road from Virgin city to Toquerville last summer ; 
but all this will be described by my student companions. 
FIGure 9. 
Diagram of a rock-splinter on the Hurricane fault. 
The Topography of the Colorado Canyon. 
THE Cross-SECTION OF THE Canyon. — The form of the Colorado canyon 
as seen in cross-section seems everywhere responsive to the resistance of 
the rocks in which it is carved. The river appears to have entrenched 
itself beneath the rising plateau with relative rapidity and continuity, 
there being no benches independent of resistant strata, and therefore no 
proof of pauses during the uplift of the region. The esplanade that 
forms so striking a feature of the canyon in the Uinkaret and in the 
western part of the Kanab plateau is accordant with the upper surface 
of the heavy sandstones that overlie the red-wall limestone in which the 
inner gorge is there cut. As was pointed out in my previous essay, 
the topographic maps of the canyon show a gradual disappearance of 
the esplanade eastward, and in the Kaibab portion of the canyon the 
stratigraphic equivalent of the esplanade is seen only in a series of 
thoroughly dissected red-wall spurs. The reason previously suggested 
