378 



I 1. \ 1 w Ilk, 11 linin 111. v., I,,.- i.l.H.' :i> in FiiT. 2, liut l.p.kinLr iin.iv direptly 



across the old < ol wliuli fdi-imn-ly w;is ofciiiiicd by a strt^am draining an aroa of 

 :-55 square nnlos in (>\t('nt. This old abandonptl valley Is filled SO feet or more 

 with ancient alhn mm and stands 30 feet or more above Bine River valley. 



renched drainap' line 

 ■rted drainage is rap- 



Fig. 4. — View taken tn m iIm I ill m \ ] .|ii.i ii.t ,,i ^, , 

 old graded valley. The trees in the dist.iiKe mark ii dicplv ii 

 belonging to the Muddy Fork of Silver Creek The ne\\l.\ di 

 idly destroying the old graded valley plain. 



tliat tlu' old valU'.v-flat is composed of alluvium to a considerable depth, 

 probably as much or more than the entire 30 feet of its projection arjove 

 Blue Kiver valley, (See Fig. 5). This alluviuu) composed of gravels and 



