 | 1908 - 1244 Seiten
...troughs, in general parallel to each other and separated by well-defined ridges. The trend of the troughs is approximately N. 30° E. Their form is directly...standpoint the most important of these valleys, extends NESS W. from the vicinity of Springville to beyond Vance, and NW-SE. from the Warrior coal-field, or... | |
 | Industrial Development Manufacturers Record - 1924 - 452 Seiten
...directly dependent on the geologic structure and character of the underlying rocks along the axes of the anticlines, the most enduring strata, on the limbs...folds, forming the rims of the valleys. At distances of two to five miles apart "gaps" reaching to the valley level cut at right angles through the ridges... | |
 | 1928 - 174 Seiten
...directly dependent on the structure and hardness of the underlying rocks. They are developed mainly on the most soluble rocks, along the axes of anticlines,...folds forming the rims of the valleys. At distances of two to five miles apart are natural openings or "gaps" in the ridges, which afford convenient passageways... | |
 | 1932 - 200 Seiten
...trending N. 30°— 40° E. and separated by well-defined ridges. The troughs are developed mainly on the most soluble rocks, along the axes of anticlines; the most enduring strata on the limbs of the folds form the rims of the valleys. At intervals of 2 to 5 miles (3.2 to 8 kilometers) are natural openings... | |
 | 1932 - 720 Seiten
...trending N. 30-40° E. and separated by well-defined ridges. The troughs are developed mainly on the most soluble rocks, along the axes of anticlines; the most enduring strata on 113 the limbs of the folds form the rims of the valleys. At intervals of 2 to S miles (3.2 to 8 kilometers)... | |
 | Chester Ray Longwell - 1933 - 360 Seiten
...trending N. 30°-40° E. and separated by well-defined ridges. The troughs are developed mainly on the most soluble rocks, along the axes of anticlines; the most enduring strata on 113 the limbs of the folds form the rims of the valleys. At intervals of 2 to 5 miles (3.2 to 8 kilometers)... | |
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They are developed mainly on the softest and most soluble rocks, along the axes of anticlines, the most enduring strata on the limbs of the folds forming the rims of the valleys. At distances of 2 to 5 miles apart openings or 