Formation of Zion Canyon[1]

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ZION

NATIONAL PARK • UTAH

_Open All Year_

[Illustration: DEPARTMENT OF THE INTERIOR · MARCH 3, 1949]

UNITED STATES DEPARTMENT OF THE INTERIOR

Oscar L. Chapman, _Secretary_

NATIONAL PARK SERVICE

Arthur E. Demaray, _Director_

_Contents_

The Great White Throne _Cover_

Formation of Zion Canyon 3

Wildlife 6

Park Season 6

How to Reach Zion 6

Roads in the Park 8

The Trail System 10

Administration 13

Naturalist Service 13

Museum 13

Free Public Campgrounds 15

Accommodations 15

Transportation 15

Saddle Horses 15

Post Office and Communication Service 15

Miscellaneous Services 15

_Historic Events_

1776 Father Escalante in search of route to Pacific crossed Virgin

River near Hurricane.

1826 Jedediah Smith, fur trader, with a party of about 16 men

exploring the region, traversed Virgin River.

1847 Brigham Young and his band of Mormons founded Salt Lake City

and began the colonization of Utah.

1858 The colonization of Utah’s “Dixie” begun by the Mormons.

1858 Zion Canyon discovered by Nephi Johnson, a Mormon scout.

1861 Joseph Black explored the canyon and 1 or 2 years later was

followed by a few settlers who farmed in the canyon, which

they called “Little Zion.”

1872 Maj. John Wesley Powell visited the region and gave name

“Mukuntuweap” to north fork and “Parunuweap” to east fork of

Virgin River.

1909 Mukuntuweap National Monument established by Presidential

proclamation.

1914 Frederick Vining Fisher visited Zion Canyon and gave names to

many of the outstanding formations, such as Great White

Throne and Angels Landing.

1917 Wylie Way Camp, first tourist accommodations, constructed.

1918 Monument enlarged and the name changed to Zion by

Presidential proclamation.

1919 Monument changed to a national park by act of Congress.

1923 President Warren G. Harding visited the park on June 27.

1930 East Rim road and tunnel completed and dedicated.

[Illustration: Illustrated drop-cap]

Zion National Park, located in the heart of the spectacular desert and

canyon country of southern Utah, has as one of its chief features the

great multicolored gorge, Zion Canyon. The sandstone cliffs, rising

sheer to form the canyon walls and encircle the valley, are awesome; but

it is the vivid coloring which most amazes. The deep red of the

Vermilion Cliffs is the prevailing tint. Two-thirds of the way up these

marvelous walls and temples are painted varying shades of red; then,

above the reds they rise in startling white, sometimes surmounted by a

cap of brilliant red.

Formation of Zion Canyon[1]

Zion Canyon, the best known example of a deep, narrow, vertically walled

chasm readily accessible for observation, was made by the north fork of

the Virgin River, the stream which now flows through it. Before this

stream established its course there was no canyon. During the long

period since its course was established the river has slowly deepened

its channel and extended it headward until its original shallow valley

has become a long narrow trench between towering walls. Though now

deeply entrenched in the rocks of the Kolob Plateau, the river maintains

substantially its original pattern. It flows in the same direction, and

the curves and straight stretches of its present walls duplicate the

meanders of the stream when it flowed some 5,000 feet above its present

level.

For many thousands of years the Virgin River and its tributaries have

been busy with two tasks, namely, deepening their channels and

transporting material weathered from the canyon walls. At present the

Virgin carries away from the park each year about 3,000,000 tons of

ground-up rock at an average rate of 180 carloads a day. For such

effective work the many-branched river seems incompetent. But though

relatively small in volume, this stream system falls from 50 to 70 feet

per mile (nine times the fall of the Colorado in Grand Canyon) and is at

work on rock, chiefly sandstone, that disintegrates with exceptional

ease. Many tributaries are on bare rock, little retarded by vegetation,

and are fed by short but violent showers. Consequently, they are brought

to flood stage not only seasonally but with each period of heavy

rainfall. Because they flow only in response to showers, the smaller

tributaries are unable to cut channels as deep as the perennial master

stream. From their mouths high on the canyon walls, they descend as

waterfalls.

Though they are primarily responsible for the depth and position of the

canyons, the Virgin River itself and the other streams heading on the

adjoining plateaus are only incidentally concerned with the detailed

carving that makes Zion Canyon unique. The walls are retreating in

consequence of ground water which emerges as springs and seeps, rain

which falls directly into the canyon, water that spills over the rim,

frost and tree roots which pry off slabs, and chemical agencies which

weaken the rock by the removal of the cement about individual grains.

Continuous sapping at or near the contact of the porous Navajo sandstone

and the more impervious underlying beds has developed alcoves in the

canyon walls at Wiley Retreat, the Stadium, Weeping Rock, Emerald Pool,

Birch Creek, Oak Creek, and elsewhere.

[Illustration: _Generalized section of sediments in Zion and Bryce

Canyons._]

Zion National Park, Utah (1951) · 第 1 / 19 题