1 66 EXPLORATION OF THE CAJStONS OF THE COLORADO. 
in the rocks through which the channels are now carved, but that the beds 
in which the streams had their origin when the district last appeared above 
the level of the sea, have been swept away. I propose to call such super 
imposed valleys. Thus the valleys under consideration, if classified on the 
basis of their relation to the rocks in which they originated, would be called 
consequent valleys, but if classified on the basis of their relation to the rocks 
in which they are now found, would be called superimposed valleys. 
Recurring again to the valleys of the Uinta Mountains, it may be well 
to remark here that, coming from the Rocky Mountains to the study of the 
Uinta Mountains, I at first supposed that the valleys of this region also were 
superimposed upon the rocks now seen, but gradually, on a more thorough 
study, the hypothesis was found to be not only inadequate to the explana 
tion of the facts, but to be entirely inconsistent with them; and again and 
again I visited the region, and re-examined the facts, and at last reached the 
conclusion which I have heretofore stated. 
A brief reference to the character of this evidence may not be out of 
place here, though I reserve the subject for a more full discussion in my 
report on the geology of the Uinta Mountains. If the valleys were super 
imposed on the present rocks, they must be consequent to rocks which have 
been carried away; but the valleys consequent upon the corrugation, which 
was one of the conditions of the origin of the Uinta Mountains, could not 
have taken the direction observed in this system; they would have all been 
cataclinal, as they ran down from the mountains, and turned into synclinal 
valleys at the foot, forming a very different system from that which now 
obtains. Again, the later sedimentary beds, both to the north and south, 
were found not to have been continuous over the mountain system, but to 
have been deposited in waters whose shores were limited by the lower 
reaches of the range; that is, they all gave evidence of littoral origin, and, 
further, that the principal canons through the mountains had been carved 
nearly to their present depth before the last of these sediments were 
deposited. 
BAD-LANDS AND ALCOVE LANDS SOUTH OF THE UINTA MOUNTAINS. 
South of the Uinta Mountains, and beyond the hog-backs on either 
side of the river, is a district known to the Indians as Wa-ka-ri' -chits, or the 
