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Books Books 1 - 2 of 2 on They are developed mainly on the softest and most soluble rocks, along the axes of....
" 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  "
Contributions to Economic Geology, 1906: Metals and nonmetals, except fuels - Page 131
by Edwin Clarence Eckel, Samuel Franklin Emmons - 1907
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Mining and Metallurgy: Published Monthly by the American ..., Issues 19-24

Mineral industries - 1908
...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...
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Transactions of the American Institute of Mining, Metallurgical ..., Volume 40

Mineral industries - 1910
...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...apart openings or " gaps," some of which extend to the valley-level, are cut at right angles through the ridges and afford convenient passageways between...
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