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Updated: June 20, 2025
Farther up the valley, the sides are bounded throughout its entire length by level, gravel-capped terraces, rising above each other in steps. The width between the upper escarpments is on an average between seven and ten miles; in one spot, however, where cutting through the basaltic lava, it was only one mile and a half.
The region is also characterized by many buttes. These are plateaus or mesas of still smaller dimensions in horizontal distance, though their altitude may be hundreds or thousands of feet. Like the mesas and plateaus, they sometimes form very conspicuous features of a landscape and are of marvelous beauty by reason of their sculptured escarpments.
Dark shadows rested on the romantic ravines, and on the deep hollows of the hills; but elsewhere over this gentle landscape of wooded amphitheatres, broad green meadows, rocky escarpments, and many-colored fields, light and shade gayly chased each other. Never were the vistas of the widening river more beautiful than to-day.
She had wallowed in Waddington's style till she was saturated with it and wrote automatically about "bold escarpments" and "the rosy flush on the high forehead of Cleeve Cloud"; about "ivy-mantled houses resting in the shade of immemorial elms"; about the vale of the Windlode, "awash with the golden light of even," and "grey villages nestling in the beech-clad hollows of the hills."
The country is at once hilly and mountainous, but rich in alluvial river valleys, as flat and as wide, very often, as plains; and the chains which divide and which bound it are as various as can be: the crystalline crags of Carrara, the washed away cones and escarpments of the high Apennines, repeating themselves in counter forts and foothills, and the low, closely packed ridges of the hills between Florence and Siena.
If it were possible to trace any one of the many beach-lines, composing each sloping terrace, it would of course be horizontal; but the only lines of demarcation are the summit and basal edges of the escarpments.
It is bordered by the escarpments, one above the other, of two plains, which diverge as they approach the Cordillera, and consequently resemble, at two levels, the shores of great bays facing the mountains; and these mountains are breached in front of the lower plain by a remarkable gap.
To show the vast power of the wearing action of sea-beaches, we need only appeal to the great cliffs along the present coast of Patagonia, and to the escarpments or ancient sea-cliffs at different levels, one above another, on that same line of coast.
Southward of Bahia Blanca, the river Colorado flows between two plains, apparently from thirty to forty feet in height. Of these plains, the southern one slopes up to the foot of the great sandstone plateau of the Rio Negro; and the northern one against an escarpment of the Pampean deposit; so that the Colorado flows in a valley fifty miles in width, between the upper escarpments.
The grandest exhibitions, says Sir R. Murchison, of the Old Red Sandstone in England and Wales appear in the escarpments of the Black Mountains and in the Fans of Brecon and Carmarthen, the one 2862, and the other 2590 feet above the sea.
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