Guidebook of the Western United States (Classic Reprint)
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| Partner: | buecher.de |
| Hersteller: | Forgotten Books (Campbell, Marius Robinson) |
| Stand: | 2015-08-04 03:50:33 |
Produktbeschreibung
Excerpt from Guidebook of the Western United States The history and the phenomena of this glaciation are considered in detail at several places in this book. The general features of the country west of the Mississippi are represented on Plate I. When, after crossing the Great Plains, the traveler reaches the foothills of the Rocky Mountains he will have attained a height of 4,000 feet above the sea, a height reached by few peaks in the Eastern States outside of the Adirondacks and the White Mountains. The Rocky Mountains form a great, irregular, rough-hewn "backbone" for the continent. They comprise many groups of ranges, in which some peaks in Montana and Idaho reach a height of 12,000 feet above sea level and some in Colorado rise more than 14,000 feet. The western-mountains, like the eastern, are the worn remnants of upward folds or crumples or of upheaved blocks of the fractured earth crust, but, unlike the eastern mountains, which are geologically old, the western mountains are geologically very young. They are therefore higher, for since they were uplifted there has not been time for ice, rain, heat, frost, and wind to wear them down to lower levels. West of the Rocky Mountains lies a broad interior basin, in the northern part of which, with its inclosing mountains, there is sufficient rain and snow to maintain the flow of the great Columbia River; but in the southern part, in what is known as the Great Basin, the mountain streams find no outlets to the sea, their waters, so precious for irrigation, being soon lost in the thirsty lowlands, and the feeble or intermittent rivers of the valleys carry their waters down to be evaporated in alkali marshes or on saline deserts. The part of the Columbia River basin or plateau that is traversed by the Northern Pacific Railway is made up of lava flows, among the greatest in the world, which in comparatively recent geologic time spread like a fiery flood over hundreds of thousands of square miles; and a wide expanse of hard, dark volcanic rocks, whose surface is here and there cut deeply by streams, shows the enormous extent and volume of these eruptions. The part of this old lava plain that is crossed by Columbia River is the most arid region traversed by this route. The precipitation in this region is sometimes not more than 6 inches annually, but despite the small rainfall the uplands have become the great wheat-raising country of the Northwest. The last great natural feature to be crossed by the traveler is the Cascade Range, which separates the interior basin from the region of Puget Sound. This range is a broad upland that stands from 6,000 to 8,000 feet above the sea, and here the evidences of volcanic activity continue to be conspicuous. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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