PHYSIOGRAPHY OF THE BEAVERDELL MAP-AREA. 
27 
Rectilinearity and Parallelism. 
The trend of the valleys within the quadrangle varies from 
north-south to northeast-southwest, with minor stretches trend- 
ing nearly east-west. In detail they seem to be made up of a 
number of intersecting straight stretches. A stream will follow 
one course for distances up to 6 miles, and then turn more or 
less abruptly into the next. In general a number of these 
will trend in somewhat the same direction for a long distance, 
and then there will be a turn nearly at right angles. The Beaver, 
for instance, flows southerly for about 10 miles, and then turns 
west for 3$, then south 35 degrees west for 5 miles. 
The characteristic of intersecting straight stretches is more 
marked where the streams are incised in narrow rock canyons 
as are Cedar, Crystal, and Hall creeks, than where they flow 
over thick unconsolidated material in broad valleys, as in the 
case of parts of the headwaters of Beaver and Maloney creeks. 
Straight stretches in adjacent valleys often exhibit a rough 
parallelism, for instance Trapper creek, the upper 1$ miles 
of China creek, and the valley lying directly southeast of 
China buttes, are almost exactly parallel to each other with a 
trend of about 35 degrees east of north. The upper part of 
Weird creek, 3^ miles of Hall creek, and 2 miles of the West 
Fork just above where Trapper creek joins it, are parallel, 
trending 2 degrees east of north. The upper 3$ miles of Maloney 
creek is paralleled to the west by the Beaver between Joan and 
Clark lakes, and by a short stream lying between these two ; this 
system trends nearly due north. Another good example is the 
lower 5 miles of the Beaver, and the shallow trough on King 
Solomon mountain about miles to the northwest of the 
Beaver. In the areas underlain by quartz diorite and quartz 
monzonite batholiths, one sometimes finds series of small par- 
allel valleys and draws such as described under local slopes in 
the uplands. 
Along the valley of Hall creek a number of small dry draws 
are to be seen upon the valley sides, trending in a direction par- 
allel to that of the main valley. They are bounded by cliffs 
and look as if they had been partly sliced out of the valley side 
