The Geologic Story of Colorado National Monument: Revised Edition — John Shaqi
The Geologic Story of Colorado National Monument: Revised EditionLohman, Stanley William
Science
The Geologic Story of Colorado National Monument: Revised Edition
Lohman, Stanley William
Colorado National Monument (Colo.); Geology -- Colorado -- Colorado National Monument
[Mile-marker 3]
After Colorado Highway 340 curves right it is known as Broadway—a paved
road serving much of The Redlands and connecting with the West Entrance
of the Monument. We will follow Broadway about 3 miles, passing low
outcrops and roadcuts of the Dakota Sandstone, some of which contain
coal beds and some of which are covered by a veneer of gravel laid down
by the river when the channel was higher. Then, at the first store and
filling station we turn southwest on another paved road known as South
Broadway.
SOUTH CAMP ROAD SIDE TRIP
[Mile-marker 4]
Just around the curve to the right is a T-intersection from which paved
South Camp Road leads south to a growing suburban area; and 2½ miles to
the southeast it connects with Monument Road at a point only half a mile
north of the East Entrance of the Monument.
Excellent views of the cliffs of dark Proterozoic rocks, the overlying
cliffs of the Wingate Sandstone, and the Redlands fault along the
northeastern border of the Monument are seen all along South Broadway,
but views from South Camp Road and several connecting roads to the
southwest are especially good. (See figs. 37 and 38.) As noted earlier,
the Redlands fault has a maximum vertical displacement of 700 or 800
feet, but dies out in scissors fashion at each end.
[Illustration: REDLANDS FAULT, looking west from South Camp Road
about one mile south of South Broadway. Fault here is nearly
vertical and normal, and lies between updragged Wingate Sandstone
and dark Proterozoic schist, gneiss, and granite. All or most of the
soft Chinle Formation has been squeezed out along the fault. Note
smooth erosion surface atop hard, dark rocks surmounted by slope of
red Chinle Formation and cliffs of Wingate Sandstone capped by
lowermost resistant beds of Kayenta Formation. (Fig. 37)]
_BRACHIOSAURUS_ MONUMENT
[Mile-marker 5]
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