Fig. 3.—View taken from the same place as in Fig. 2, but looking more directly 
across the old col which formerly was occupied by a stream draining an area of 
35 square miles in extent. This old abandoned valley is filled 80 feet or more 
with ancient alluvium, and stands 30 feet or more above Blue River valley. 
Fig. 4.—View taken from the hill in N. E. quarter of See. 31, looking east up the 
old graded valley. The trees in the distance mark a deeply intrenched drainage line 
belonging to the Muddy Fork of Silver Creek. The newly diverted drainage is rap- 
idly destroying the old graded valley plain. 
that the old valley-flat is composed of alluvium to a considerable depth, 
probably as much or more than the entire 30 feet of its projection avove 
Blue Riyer valley. (See Fig. 5). This alluvium composed of gravels and 
