232 GUIDEBOOK OF THE WESTERN UNITED STATES. 
part on the east side of that break or fault was forced up many 
thousand feet, or the part on the west was dropped an equal dis- 
tance, or both movements took place to a lesser degree. It matters 
not which side moved, for in any event the part east of the fault now 
forms mountains because it was uplifted relative to the other, or the 
other is now a low basin because it was depressed relative to the part 
on the east.*!. Although the principal movement probably took place 
long ago, slight movements have occurred so recently that they have 
broken across alluvial cones formed by small streams flowing out 
of the mountains. 
A short distance beyond Mapleton the railroad curves to the right 
and approaches the edge of the plain. There it begins to descend to a 
lower plain, which stretches away in the distance as 
far as the eye can see. Before reaching the level of 
the lower plain the railroad passes through the 
flourishing town of Springville (see sheet 10, p. 244), 
which is surrounded not only by fields of grain, 
alfalfa, and sugar beets but by orchards that stretch out mile after 
mile until they seem to be interminable. It is indeed a land of peace 
and plenty, and an added beauty is given to the scene by the still 
waters of Utah Lake shimmering in the bright sunshine. A branch 
Springville. 
Elevation 4,555 feet. 
Population 3,010. 
Denver 696 miles. 
*'The entire Great Basin, which ex- 
tends from the Wasatch Range on the 
east to the Sierra Nevada on the west, 
is characterized by faulted mountains 
like the Wasatch. 
broken into grea 
blocks by the faults and later these 
blocks have been tilted in different 
directions. In the central part of the 
In the tilting the edge of the great 
block that was elevated produced a 
mountain and the edge that was. de- 
pressed 
formed a deep basin, which — 
later was phe a i by sand and 
gravel washed in m the surround- 
ing mana? In many pth the loose 
rock filling has a depth of more than 
a thousand feet. 
y pe : 
slight eraeimtts that. falls on the 
surroundi lopes finds its way to the 
lowest point, where it forms a shal- 
low lake, but the water is soon car- 
ried off by evaporation and there re- 
mains in its place only a dry lake bed, 
known in the Boum We st by the Span- 
ish name of “playa.” The entire 
basin is a frequently spoken of as 
a “bol wl-sown’), a Spanish 
that the water extends from one to the 
large supply of water it receives from 
the high ranges on the east, 
