Scarcely more than a hundred persons besides Indians, they tell me, have seen this most entrancing spectacle, perhaps, of all America. The way in is long and difficult. There are only two or three who know it, even of those who have been there more than once, and the region has no inhabitants to point directions among the confusing rocks. There is no water, nor any friendly tree.

[Ill.u.s.tration: ROOSEVELT PARTY IN MONUMENT VALLEY]

[Ill.u.s.tration: RAINBOW BRIDGE IN FULL PERSPECTIVE]

The day's ride is wearying in the extreme in spite of its fascinations.

The objective is Navajo Mountain, which, strange spectacle in this desert waste, is forested to its summit with yellow pine above a surrounding belt of juniper and pinyon, with aspen and willows, wild roses, Indian paint-brush, primrose, and clematis in its lower valleys.

Below, the multicolored desert, deep cut with the canyons which carry off the many little rivers.

Down one of these wild and highly colored desert canyons among whose vivid tumbled rocks your horses pick their course with difficulty, you suddenly see a rainbow caught among the vivid bald rocks, a slender arch so deliciously proportioned, so gracefully curved among its sharp surroundings, that your eye fixes it steadfastly and your heart bounds with relief; until now you had not noticed the oppression of this angled, spine-carpeted landscape.

From now on nothing else possesses you. The eccentricity of the going constantly hides it, and each reappearance brings again the joy of discovery. And at last you reach it, dismount beside the small clear stream which flows beneath it, approach reverently, overwhelmed with a strange mingling of awe and great elation. You stand beneath its enormous encircling red and yellow arch and perceive that it is the support which holds up the sky. It is long before turbulent emotion permits the mind to a.n.a.lyze the elements which compose its extraordinary beauty.

Dimensions mean little before spectacles like this. To know that the span is two hundred and seventy-eight feet may help realization at home, where it may be laid out, staked and looked at; it exceeds a block of Fifth Avenue in New York. To know that the apex of the rainbow's curve is three hundred and nine feet above your wondering eyes means nothing to you there; but to those who know New York City it means the height of the Flatiron Building built three stories higher. Choose a building of equal height in your own city, stand beside it and look up. Then imagine it a gigantic monolithic arch of entrancing proportions and fascinating curve, glowing in reds and yellows which merge into each other insensibly and without form or pattern. Imagine this fairy unreality outlined, not against the murk which overlies cities, but against a sky of desert clarity and color.

All natural bridges are created wholly by erosion. This was carved from an outstanding spur of Navajo sandstone which lay crosswise of the canyon. Originally the stream struck full against this barrier, swung sideways, and found its way around the spur's free outer edge. The end was merely a matter of time. Gradually but surely the stream, sand-laden in times of flood, wore an ever-deepening hollow in the barrier. Finally it wore it through and pa.s.sed under what then became a bridge. But meantime other agencies were at work. The rocky wall above, alternately hot and cold, as happens in high arid lands, detached curved, flattened plates. Worn below by the stream, thinned above by the destructive processes of wind and temperature, the window enlarged. In time the Rainbow Bridge evolved in all its glorious beauty. Not far away is another natural bridge well advanced in the making.

The Rainbow Bridge was discovered in 1909 by William Boone Dougla.s.s, Examiner of Surveys in the General Land Office, Santa Fe. Following is an abstract of the government report covering the discovery:

"The information had come to Mr. Dougla.s.s from a Paiute Indian, Mike's Boy, who later took the name of Jim, employed as flagman in the survey of the three great natural bridges of White Canyon. Seeing the white man's appreciation of this form of wind and water erosion, Jim told of a greater bridge known only to himself and one other Indian, located on the north side of the Navajo Mountain, in the Paiute Indian reservation.

Bending a twig of willow in rainbow-shape, with its ends stuck in the ground, Jim showed what his bridge looked like.

"An effort was made to reach the bridge in December. Unfortunately Jim could not be located. On reaching the Navajo trading-post, Oljato, nothing was known of such a bridge, and the truth of Jim's statement was questioned.

"The trip was abandoned until August of the following year, when Mr.

Dougla.s.s organized a second party at Bluff, Utah, and under Jim's guidance, left for the bridge. At Oljato the party was augmented by Professor c.u.mmings, and a party of college students, with John Wetherill as packer, who were excavating ruins in the Navajo Indian Reservation.

As the uninhabited and unknown country of the bridge was reached, travel became almost impossible. All equipment, save what was absolutely indispensable, was discarded. The whole country was a maze of box canyons, as though some turbulent sea had suddenly solidified in rock.

Only at a few favored points could the canyon walls be scaled even by man, and still fewer where a horse might clamber. In the sloping sandstone ledges footholds for the horses must be cut, and even then they fell, until their loss seemed certain. After many adventures the party arrived at 11 o'clock, A.M., August 14, 1909.

"Jim had indeed made good. Silhouetted against a turquoise sky was an arch of rainbow shape, so delicately proportioned that it seemed as if some great sculptor had hewn it from the rock. Its span of 270 feet bridged a stream of clear, sparkling water, that flowed 310 feet below its crest. The world's greatest natural bridge had been found as Jim had described it. Beneath it, an ancient altar bore witness to the fact that it was a sacred shrine of those archaic people, the builders of the weird and mysterious cliff-castles seen in the Navajo National Monument.

"The crest of the bridge was reached by Mr. Dougla.s.s and his three a.s.sistants, John R. English, Jean F. Rogerson, and Daniel Perkins, by lowering themselves with ropes to the south abutment, and climbing its arch. Probably they were the first human beings to reach it.

"No Indian name for the bridge was known, except such descriptive generic terms as the Paiute 'The s.p.a.ce under a horse's belly between its fore and hind legs,' or the 'Hole in the rock' (nonnezoshi) of the Navajo, neither of which was deemed appropriate. While the question of a name was still being debated, there appeared in the sky, as if in answer, a beautiful rainbow, the 'Barahoni' of the Paiutes.

"The suitability of the name was further demonstrated by a superst.i.tion of the Navajos. On the occasion of his second visit, the fall of the same year, Mr. Dougla.s.s had as an a.s.sistant an old Navajo Indian named White Horse, who, after pa.s.sing under the bridge, would not return, but climbed laboriously around its end. On being pressed for an explanation, he would arch his hand, and through it squint at the sun, solemnly shaking his head. Later, through the a.s.sistance of Mrs. John Wetherill, an experienced Navajo linguist, Mr. Dougla.s.s learned that the formations of the type of the bridge were symbolic rainbows, or the sun's path, and one pa.s.sing under could not return, under penalty of death, without the utterance of a certain prayer, which White Horse had forgotten. The aged Navajo informant would not reveal the prayer for fear of the 'Lightning Snake.'"

If your return from Rainbow Bridge carries you through Monument Valley with its miles of blazing red structures, memory will file still another amazing sensation. Some of its crimson monsters rise a thousand feet above the gra.s.sy plain.

NATURAL BRIDGES NATIONAL MONUMENT

Not many miles north of the Rainbow Bridge, fifty miles from Monticello in southern Utah, in a region not greatly dissimilar in outline, and only less colorful, three natural bridges of large size have been conserved under the t.i.tle of the Natural Bridges National Monument.

Here, west of the Mesa Verde, the country is characterized by long, broad mesas, sometimes crowned with stunted cedar forests, dropping suddenly into deep valleys. The erosion of many thousands of centuries has ploughed the surface into winding rock-strewn canyons, great and small. Three of these canyons are crossed by bridges stream-cut through the solid rock.

The largest, locally known as the Augusta Bridge, is named Sipapu, Gate of Heaven. It is one of the largest natural bridges in the world, measuring two hundred and twenty-two feet in height, with a span of two hundred and sixty-one feet. It is a graceful and majestic structure, so proportioned and finished that it is difficult, from some points of view, to believe it the unplanned work of natural forces. One crosses it on a level platform twenty-eight feet wide.

The other two, which are nearly its size, are found within five miles.

The Kachina, which means Guardian Spirit, is locally called the Caroline Bridge. The Owach.o.m.o, meaning Rock Mound, is locally known as the Edwin Bridge. The local names celebrate persons who visited them soon after they were first discovered by Emery Knowles in 1895.

They may be reached by horse and pack-train from Monticello, or Bluff, Utah. One of the five sections of the reservation conserves two large caves.

DINOSAUR NATIONAL MONUMENT

The Age of Reptile developed a wide variety of monsters in the central regions of the continent from Montana to the Gulf of Mexico. The dinosaurs of the Tria.s.sic and Jura.s.sic periods sometimes had gigantic size, the Brontosaurus attaining a length of sixty feet or more. The femur of the Brachiosaurus exceeded six feet; this must have been the greatest of them all.

The greater dinosaurs were herbivorous. The carnivorous species were not remarkable for size; there were small leaping forms scarcely larger than rabbits. The necessity for defense against the flesh-eaters developed, in the smaller dinosaurs, extremely heavy armor. The stegosaur carried huge plates upon his curved back, suggesting a circular saw; his long powerful tail was armed with sharp spikes, and must have been a dangerous weapon. Dinosaurs roamed all over what is now called our middle west.

In those days the central part of our land was warm and swampy.

Fresh-water lagoons and sluggish streams were bordered by low forests of palms and ferns; one must go to the tropics to find a corresponding landscape in our times. The waters abounded in reptiles and fish. Huge winged reptiles flew from cover to cover. The first birds were evolving from reptilian forms.

The absorbing story of these times is written in the rocks. The life forms were at their full when the sands were laid which to-day is the wide-spread layer of sandstone which geologists call the Morrison formation. Erosion has exposed this sandstone in several parts of the western United States, and many have been the interesting glimpses it has afforded of that strange period so many millions of years ago.

In the Uintah Basin of northwestern Utah, a region of bad lands crossed by the Green River on its way to the Colorado and the Grand Canyon, the Morrison strata have been bent upward at an angle of sixty degrees or more and then cut through, exposing their entire depth. The country is extremely rough and bare. Only in occasional widely separated bottoms has irrigation made farming possible; elsewhere nothing grows upon the bald hillsides.

Here, eighteen miles east of the town of Vernal, eighty acres of the exposed Morrison strata were set aside in 1915 as the Dinosaur National Monument. These acres have already yielded a very large collection of skeletons. Since 1908 the Carnegie Museum of Pittsburgh has been gathering specimens of the greatest importance. The only complete skeleton of a dinosaur ever found was taken out in 1909. The work of quarrying and removal is done with the utmost care. The rock is chiselled away in thin layers, as no one can tell when an invaluable relic may be found. As fast as bones are detached, they are covered with plaster of Paris and so wrapped that breakage becomes impossible. Two years were required to unearth the skeleton of a brontosaurus.

The extraordinary ma.s.sing of fossil remains at this point suggests that floods may have swept these animals from a large area and lodged their bodies here, where they were covered with sands. But it also is possible that this spot was merely a favorite feeding-ground. It may be that similarly rich deposits lie hidden in many places in the wide-spread Morrison sandstone which some day may be unearthed. The bones of dinosaurs have been found in the Morrison of Colorado near Boulder.

PETRIFIED FOREST NATIONAL MONUMENT

For a hundred and twenty-five or thirty miles southwest of the Grand Canyon, the valley of the Little Colorado River is known as the Painted Desert. It is a narrow plain of Carboniferous and Tria.s.sic marls, shales, sandstones, and conglomerates, abounding in fossils, the most arid part of Arizona; even the river's lower reaches dry up for a part of each year. But it is a palette of brilliant colors; it will be difficult to name a tint or shade which is not vividly represented in this gaudy floor and in the strata of the cliffs which define its northern and eastern limits. Above and beyond these cliffs lies that other amazing desert, the Navajo country, the land of the Rainbow Bridge and the Canyon de Ch.e.l.ly.

I have mentioned the Painted Desert because it is shaped like a long narrow finger pointed straight at the Petrified Forests lying just beyond its touch. Here the country is also highly colored, but very differently. Maroon and tawny yellow are the prevailing tints of the marls, red and brown the colors of the sandstones. There is a rolling sandy floor crisscrossed with canyons in whose bottoms grow stunted cedars and occasional cottonwoods. Upon this floor thousands of petrified logs are heaped in confusion. In many places the strong suggestion is that of a log jam left stranded by subsiding floods.

Nearly all the logs have broken into short lengths as cleanly cut as if sawn, the result of succeeding heat and cold.

Areas of petrified wood are common in many parts of the Navajo country and its surrounding deserts. The larger areas are marked on the Geological Survey maps, and many lesser areas are mentioned in reports.

There are references to rooted stumps. The three groups in the Petrified Forest National Monument, near the town of Adamana, Arizona, were chosen for conservation because they are the largest and perhaps the finest; at the time, the gorgeously colored logs were being carried away in quant.i.ties to be cut up into table-tops.

As a matter of fact, these are not forests. Most of these trees grew upon levels seven hundred feet or more higher than where they now lie and at unknown distances; floods left them here.

[Ill.u.s.tration: THE PETRIFIED FOREST OF ARIZONA

Showing the formation in colored strata. The logs seen on the ground grew upon a level seven hundred feet higher]

[Ill.u.s.tration: PETRIFIED TRUNK FORMING A BRIDGE OVER A CANYON

The trunk is 111 feet long. The stone piers were built to preserve it]

The First Forest, which lies six miles south of Adamana, contains thousands of broken lengths. One unbroken log a hundred and eleven feet long bridges a canyon forty-five feet wide, a remarkable spectacle. In the Second Forest, which lies two miles and a half south of that, and the Third Forest, which is thirteen miles south of Adamana and eighteen miles southeast of Holbrook, most of the trunks appear to lie in their original positions. One which was measured by Doctor G.H. Knowlton of the Smithsonian Inst.i.tution was more than seven feet in diameter and a hundred and twenty feet long. He estimates the average diameters at three or four feet, while lengths vary from sixty to a hundred feet.

The coloring of the wood is variegated and brilliant. "The state of mineralization in which most of this wood exists," writes Professor Lester F. Ward, paleobotanist, "almost places them among the gems or precious stones. Not only are chalcedony, opals, and agates found among them, but many approach the condition of jasper and onyx." "The chemistry of the process of petrifaction or silicification," writes Doctor George P. Merrill, Curator of Geology in the National Museum, "is not quite clear. Silica is ordinarily looked upon as one of the most insoluble of substances. It is nevertheless readily soluble in alkaline solutions--_i.e._, solutions containing soda or potash. It is probable that the solutions permeating these buried logs were thus alkaline, and as the logs gradually decayed their organic matter was replaced, molecule by molecule, by silica. The brilliant red and other colors are due to the small amount of iron and manganese deposited together with the silica, and super-oxydized as the trunks are exposed to the air.

The most brilliant colors are therefore to be found on the surface."

The trees are of several species. All those identified by Doctor Knowlton were Araucaria, which do not now live in the northern hemisphere. Doctor E.C. Jeffrey, of Harvard, has described one genus unknown elsewhere.