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
About 1½ miles south of the Colorado River we reach the T-intersection
noted previously—at the end of the trip from Grand Junction through The
Redlands to the West Entrance of the Monument—and we are ready for our
trip through the Monument.
Through the Monument from West to East Entrances
WEST ENTRANCE
[Mile-marker 10]
After turning south on Rim Rock Drive from the intersection with
Colorado Highway 340 (Broadway), we cross the Monument’s northern
boundary and reach the checking station at the West Entrance, where a
small entry fee is charged during the summer. At the first left turn we
are in red beds of the Chinle Formation, then in sheared and broken beds
of the Wingate Sandstone along the Kodels Canyon fault. At the
easternmost loop of the road we may look southeastward across Lizard
Canyon to the Lizard Canyon monocline (fig. 30), and if we look down the
slope to the east we will see one of John Otto’s well-built trails that
formerly ascended the west side of Lizard Canyon to what is now the
campground, long before Rim Rock Drive was built. Do not try to stop at
the curve, however; play it safe, drive on, and park at Redlands View a
quarter of a mile west.
REDLANDS VIEW
By walking about 50 feet north of the turnout, we get an excellent view
to the west of the Kodels Canyon fault, as shown in figure 31. Just to
the north of the fault are the sheared and broken beds of the Wingate
Sandstone along the east end of this fault.
NEW EARTHFILL
Just beyond the turnout the road curves left through a cut in the
Wingate Sandstone and ascends the east side of Fruita Canyon. About a
quarter of a mile from the parking area we get a good view (fig. 44) to
the west of the new earthfill on Rim Rock Drive between the two tunnels.
The original fill was washed out in a few minutes on August 8, 1968, by
a cloudburst that dumped an estimated 4 inches of rain on the mesa west
of Fruita Canyon. A culvert beneath the road just north of the north
tunnel was wholly unable to cope with the resulting flood, part of which
plunged over the cliff but most of which roared southward through the
tunnel. According to the only known eyewitnesses—a couple from Ohio
whose car was stalled in 18 inches of swift water in the lower tunnel—an
estimated 4 feet of water flowing through the north tunnel soon
separated the two tunnels by a gaping chasm and flowed down where the
fill had been but moments earlier. They jockeyed their car back and
forth in the south tunnel and retraced the route back toward Fruita.
Later I viewed the chasm from the portal of the north tunnel and found
it awesome indeed.
[Illustration: NEW FILL ON RIM ROCK DRIVE BETWEEN TWO TUNNELS ON
WEST SIDE OF FRUITA CANYON, looking west from east side of canyon.
Previous fill was washed out by flash flood, as described in text.
(Fig. 44)]
[Illustration: Petroglyph]
Public-domain text, read in full here on John Shaqi.
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