80 
GUIDEBOOK OF THE WESTERN UNITED STATES. 
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at different elevations before the 
granite was arched and broken by 
faults, as shown in figure 16. Thus 
the lowermost formation at Canon 
City may have originally extended 
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onto the granite a mile or so and the 
next one 2 or 3 miles, and so on, until 
finally, when the Morrison was de- 
posited, the entire area was low, and 
the Morrison beds were laid down 
continuously from Canon City to 
Parkdale. 
West of milepost 170 the beds dip 
sharply toward the west, as shown in 
figure 16, and the Dakota disappears 
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n brought into this abnormal re- 
lation by a fault that dropped the 
shale on the east as compared with 
the granite on the west. This rela- 
tion of the shale and the granite is 
illustrated in figure 16. 
Beyond this fault the hill on the 
north (right) of the railroad is com- 
posed entirely of granite, but on the 
south the variegated shale of the 
Morrison rests on the granite just as 
it was deposited ages ago. the 
point where the railroad crosses Tal- 
lahassee Creek the Morrison outerop 
swings to the north, and a hill com- 
posed of this formation, capped by 
Dakota sandstone, which dips toward 
the west, may be seen half a mile 
away. The sedimentary rocks can 
not continue in this direction much 
farther, for the granite, which can be 
seen on the north, makes a high rim 
completely around the valley. 
e rock in the middle of the val- 
ley is concealed by a deep cover 
of gravel, which the river has ev!- 
dently brought down from the high 
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