RECONNAISSANCE IN COLORADO AND UTAH 663 
the base. No fault was found, and it seems to me improbable that 
the boundary is of that nature in the vicinity of West Creek. Where 
the sediment was seen resting on granite, the lower layers consisted 
Fic. 10.—In a ravine on south side of West Creek, Colorado, about 5 miles east 
of Dolores River. To show character of Permian (?) conglomerates and grits very 
near granite mass of Uncompahgre Plateau from which they were derived (p. 662). 
of coarse, angular gravel, scarcely bedded at all. At a distance of a 
few feet above the granite bedding planes become more distinct, 
through alternation of finer and coarser material aided by color differ- 
