78 



are the terraces coutiiiuous for the whole distance incllcated on the pro- 

 files, but consist of remnants, part on one side, part on tlie other side of 

 the stream. 



At the upper level, there is first a continuous terrace on the west side 

 of the stream for about half a mile; next, in the down-stream direction, 

 for about i mile on the east side ; below this for some distance not more 

 than a trace on eitlier side, succeeded b.v nearly continuous terraces ou 

 both sides for more than l mile ; again a distance of about i mile with 

 eitlier no trace remaining or merel.v .shoulder-like projections here and 

 there: and finali.v at the sontli end of the canyon-like part of the valley, 

 a terrace 2 mile in length on the east side, with a renmant only a few 

 rods in longtli on the west side. 



At the lower level the terraces are likewise discontinuous in places 

 and found only at times on both sides of the stream at the same ix)int. 



The width of these terraces is, at the maximum, about 60 feet; aver- 

 age, perhaps 20 to 30 feet; see Figs. 4 and 5. At both levels the terraces 

 are chiefly rock cut, only a small amount of soil, talus, glacial debris, and 

 rock waste l)eing found upon tlioir surfaces, and the rock in place rising 

 in each case on the side away fri>m the stream sometimes as a steep, wall- 

 like slope until, at an elevation above the upper terrace nearly as great 

 as the general level of the country, a considerable amount of glacial drift 

 it found. 



Perhaps the most interesting and significant feature about these ter- 

 races is their gradient as compared with the gradient of the stream, and 

 with sea-level as a datum. The terraces of the upper level vary in height 

 above the stream from to 8 feet at the point farthest upstream where 

 they are clearly marked, to 04 feet above the stream at the farthest down- 

 stream point, a differential elevation of about 57 feet, rising higher and 

 higher the farther downstream they are found. This suggested at firsc 

 that there might be :in error in correlating the separate remnants as parts 

 of the same terrace ; but it was observe<l that in each case where the ter- 

 race was continuous for al)out A mile, there was this consistent rise in the 

 downstream direction ; in one case a rise of about 25 feet in a half-mile's 

 distance; in another case a rise of 11 feet in a little less than * mile. The 

 shoulder-like points and projections and smaller terrace remnants where 

 the terraces are discontinuous, have elevations agi-eeing closely with the 

 general rise of the gradient in the downstream direction. 



