DAVIS: THE WASATCH, CANYON, AND HOUSE RANGES. 29 
drawn from early surveys according to certain ill-defined general prin- 
ciples: they cannot be accepted as guides to actual forms. 
A peculiar experience of this day’s ride was the dust storm we en- 
countered. The morning at Nephi was fresh and clear, the tempera- 
ture at 6.30 being 70°. At 8.35, when we were crossing the notch in 
the subdued range west of Nephi, a light breeze from the southwest 
was blowing, and the sky was still clear. Before noon the breeze 
had increased to a warm gale, temperature 80° to 85°, bearing clouds 
of dust and making the sky chalky white, so that the sun cast only 
the palest shadows. Our ride directly into the dusty wind, which often 
carried grit and sand in its stronger flaws, was fatiguing and irritat- 
Ing. A curious accompaniment of the wind was a standing stratus 
cloud that formed somewhat northeast of the Canyon range and ap- 
parently high above it, increasing through the morning and fading 
away with the wind in the late afternoon and evening. Cloud fila- 
ments could be seen growing and knitting together as they entered the 
Western or windward side of the cloud, and dissolving away as they 
floated out on the eastern or leeward side; yet the cloud as a whole 
Stood motionless in the rushing air currents. There appeared to be 
no eddying or rolling of the cloud, such as is supposed to be associated 
With the Helm bar or cloud of northwest England. We stopped for 
the night at a Swede’s ranch in Lemington, about two miles west of 
the outlet of Sevier canyon, where the river had opened a broad strath 
In the sands of the Provo delta. It was interesting to note that as 
the dusty gale decreased in the late afternoon, it veered to the west 
and northwest, and that it finally died away as a light breeze from the 
north after twilight was gone. 
The Western Face of the Canyon Range. On July 16th we had a 
Most interesting ride southward from Lemington along the western 
Side of the Canyon range to Oak City, near its southwestern end. 
After rising from the Sevier strath to the delta level, there was a good 
View of the many ridges which make up the mountain mass. The 
Northeast-southwest strike of the strata, observed in the canyon the 
day before, brings some of the ridges directly out to the western border 
of the range, where they end in rather gradual slopes. A little farther 
South, the strike turns southward, and continues for several miles 
nearly but not exactly parallel to the mountain border. At first the 
dip is rather steep into the axis of the range; farther on the beds are 
Or a time nearly horizontal. The structure therefore presents dis- 
Cordant relations with the range border, and thus strongly suggests 
block faulting; but the valleys between the ridges are well opened and 
