The Quarterly Journal, Vol. 4
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| Partner: | buecher.de |
| Hersteller: | Forgotten Books (Dakota, University of North) |
| Stand: | 2015-08-04 03:50:33 |
Produktbeschreibung
Excerpt from The Quarterly Journal, Vol. 4: Of the University of North Dakota On the accompanying geological map of North Dakota is shown the distribution of the different rock formations of the State. The glacial drift which forms a mantle of varying thickness overlying the older rocks thruout most of the region is not represented. The map thus gives the areal distribution of the formations as nearly as this can be determined beneath the covering of glacial deposits. It is only recently that sufficient data have been at hand for the preparation of even an approximately correct geological map of the state and there is still much to be learned regarding the distribution and extent of several of the formations. The map which is herewith presented can hardly be regarded, therefore, as more than provisional and intended to record the present state of our knowledge regarding the geology of the region. As indicated on the map, the geological formations occurring in North Dakota all belong to the Cretaceous, Tertiary and Pleistocene periods. Some were deposited in the great sea which at one time covered the Great Plains region; others were formed in lakes or were deposited by rivers, while still others owe their origin to extensive continental glaciers. Cretaceous System Dakota Sandstone The Dakota sandstone, which lies at the base of the Cretaceous, does not appear at the surface anywhere in the state, but has been reached in many deep wells. It is of economic importance in North and South Dakota, as the source of artesian water. Over most of the state it lies at considerable depth below the surface. 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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