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hen the country suddenly rises by a stupendous line of cliffs 2,000 or 3,000 feet high. These cliffs are composed of sand stones, limestones, and shales, of many colors. The stratification in many places is minute, so that they have been called the Book Cliffs. From the cliffs many salients are projected into the valleys, and within deep re-entering angles vast amphitheaters appear. About the projected salients many towering buttes, with pinnacles and minarets, are found. The long, narrow plateau is covered with a forest along its summit, and, though it rises abruptly on the south side from Grand River Valley, it descends more gently toward the White River, and on this slope many canyons of rare beauty are seen. Plateaus and mesas and canyons and buttes characterize the region north of White River and stretch out to the Yampa. The Yampa itself has an important tributary from the northwest, known as Snake River. Just below the affluence of the Snake with the Yampa a strange phenomenon is observed. Right athwart the course of the river rises a great dome-shaped mountain, with valley stretches on every side, and through this mountain the river runs, dividing it by a beautiful canyon, through which it flows to its junction with the Green. This canyon is in soft, white sandstone, usually with vertical walls varying from 500 to 2,000 feet in height, and the river flows in a gentle winding way through all this stretch. To the east of this plateau region, with its mesas and buttes and its volcanic mountains, stand the southern Rocky Mountains, or Park Mountains, a system of north-and-south ranges. These ranges are huge billows in the crust of the earth out of which mountains have been carved. The parks of Colorado are great valley basins enclosed by these ranges, and over their surfaces moss agates are scattered. The mountains are covered with dense forests and are rugged and wild. The higher peaks rise above the timber line and are naked gorges of rocks. In them the Platte and Arkansas rivers head and flow eastward to join the Missouri River. Here also heads the Rio Grande del Norte, which flows southward into the Gulf of Mexico, and still to the west head many streams which pour into the Colorado waters destined for the Gulf of California. Throughout all of this region drained by the Grand, White, and Yampa rivers, there are many beautiful parks. The great mountain slopes are still covered with primeval forests. Springs, bro
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