PHYSIOGRAPHY OF THE BEAVERDELL MAP- ARE A. 
21 
ridge profile slopes about 200 feet to the mile from 4,900 to 4,500 
feet, and is interrupted by the Tertiary intrusive butte of Crystal 
mountain. On Kloof and Lake ridges there are many irre- 
gularities in profile, the high line varying between 4,500 and 
4,800 feet. On Cranberry ridge the elevation varies from 4,300 
to 4,000 feet with a slope of 200 to 300 feet to the mile. Series 
of lower ridges show the same evenness of crest, but a slope which 
is always more than 100 feet to the mile. For instance, a profile 
of the flat topped ridge east of the West Fork valley from Trap- 
per creek to Wallace lake, if continued on to the southeast ridge 
of King Solomon mountain, would show somewhat tabular 
surfaces at an elevation of between 3,800 and 4,100 feet. By 
shifting his position the observer can see two sets of even sky- 
lines in the same interfluve, one of which is actually 700 feet 
above the other and from If to 3 miles away. The lava capped 
Nipple Mountain block has an irregular ridgeline consisting of 
flat topped areas separated by wide draws. There is a gradual 
slope of ridgeline from the top of Ferroux mountain on this 
block south to the West Fork river. This is shown in Figure 
2, profile 4. 
Across the ridges there is a general slope down to the bound- 
ing valleys, either from one dominating ridge or from two par- 
allel ridges at nearly the same elevation. This is especially well 
brought out on the St. John interfluve, where the borders of the 
interfluve have not been much cut up by canyons (Figure 2, 
profiles 1 and 2). The high ridges here are the broad top of St. 
John ridge, and the upper end of China ridge which range from 
4,500 to over 4,800 feet in elevation. On the northern end of 
this interfluve the eastward slope is from 200 to 250 feet to the 
mile. The bounding valley of Maloney Creek trough here 
merges into the upland surface. On the southern end of the 
block the slope measured to the wall of the bounding valley is 
about 300 feet to the mile. The slope to the west is not uniform, 
but averages about 150 to 200 feet to the mile. The gentler 
slope to the west is toward the more distant but deeper valley. 
Upon the Lake Ridge, Crystal Mountain, the Wallace-Curry 
Mountain interfluves there are dominating central ridges from 
4,500 to 4,900 feet high, and cross slopes. But the upland sur- 
