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It is an irregular system of great plateaus with subordinate mesas and buttes separated by lines of cliffs and dissected by canyons. In this region all of the features which have been described as found in other portions of the province are grouped except only the cliffs of volcanic ashes, the volcanic cones, and the volcanic domes.
In the Gulf of Maine, however, with the single exception of the vicinity of Ammens Rock on the eastern part of Cashes Bank, the entire central area presents navigable deep water having a mean depth of 100 fathoms, out of which rise the various underwater plateaus, whose depths average about 50 fathoms and which constitute the larger of the fishing grounds.
On the flat plateaus the occasional rains which fall once in three or four years can effect but little transport of material, and merely lower the general level by dissolving the underlying limestone, so that the plateau surface is left with a coating of nodules and blocks of insoluble flint and chert.
The woods of ancient Greece are not less ruined than her temples; the forests of Dalmatia whence came the timber that built the navies of the ancient world are now barren plateaus, shelterless and waste; and throughout a large part of southern Europe and northern Africa, man has transformed the smile of nature into a mask of inflexible severity.
Its sources are everywhere in pine-clad mountains and plateaus, but all of the affluents quickly descend into the desert valley below, through which the Gila winds its way westward to the Colorado.
Yes if we don't lose our Little Rivers; and we must not lose it!" The silvery face of the moon grew fainter with the coming of a ruddier light; the shadows of the mountains were being etched definitely on the plateaus that stretched out like vast floors under the developing glow of sunrise; and the full splendor of day had come, with its majestic spread of vision.
Six miles of strata have been denuded from parts of the Wasatch Mountains since their rise at the beginning of the era. From the Colorado plateaus, whose uplift dates from the same time, there have been stripped off ten thousand feet of strata over thousands of square miles, and the colossal canyon of the Colorado has been cut after this great denudation had been mostly accomplished.
Far to the north were foothills covered with the glorious Norfolk pine, rising in steppes till they seemed to touch white plateaus of snow, which again billowed to glacier fields whose austere bosoms man's hand had never touched; and these suddenly lifted up huge, unapproachable shoulders, crowned with majestic peaks that took in their teeth the sun, the storm, and the whirlwinds of the north, never changing countenance from day to year and from year to age.
The walls, while not sheer, were nearly so; they might be climbed in many places to the top of the granite; but the tonto sandstone wall nearly always overhangs this, breaks sheer, and seldom affords an outlet to the plateaus above, except where lateral canyons cut through.
On each side of it, in eastern Colorado and about the Black Hills, in western Texas, in Utah, over the site of the Wasatch Mountains, and southward into Arizona over the plateaus trenched by the Colorado River, are large areas of Triassic rocks, sandstones chiefly, with some rock salt and gypsum. Fossils are very rare and none of them marine.
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