. The elements of geology, for popular use : containing a description of the geological formations and mineral resources of the United States. Geology; Geology. 66 VALLEYS, action of water or some convulsion, which has torn off and carried away the strata by which they were once covered.* This, therefore, is called a denuda- tion; and such instances are of frequent occur- rence. When valleys take the same direction as that of a range of mountains, they are called longitudinal valleys; when they cut through a range of mount- ains, they are called transversal valleys; in which case the strata on
. The elements of geology, for popular use : containing a description of the geological formations and mineral resources of the United States. Geology; Geology. 66 VALLEYS, action of water or some convulsion, which has torn off and carried away the strata by which they were once covered.* This, therefore, is called a denuda- tion; and such instances are of frequent occur- rence. When valleys take the same direction as that of a range of mountains, they are called longitudinal valleys; when they cut through a range of mount- ains, they are called transversal valleys; in which case the strata on each side are generally the same. Small valleys, which open into a larger val- ley nearly at right angles to it, are called lateral valleys. Sometimes a valley is formed by the bend- ing of the strata, thus : Fig. Bake well remarks, that the beds or strata of very lofty mountains are generally much inclined, and are sometimes nearly vertical. Among these high- ly-inclined beds we not unfrequently find beds of limestone, containing marine shells which must have been originally deposited at the bottom of the ocean. In some instances we meet with vertical strata, containing rounded pebbles and water-worn fragments of other rocks. These must also have been originally deposited on a surface nearly hori- zontal. We are therefore certain that the present vertical position of these strata is not their original one; and we hence also learn, that all the strata associated with them in the same mountain, and having the same inclination, were raised together. We have farther proof that, before the epoch when this great revolution was effected, all these beds were covered by seas then existing, and that it was * Bakewell's Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lee, Charles A. (Charles Alfred), 1
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Keywords: ., bookcentury1800, bookpublishernewyorkharperb, booksubjectgeology
