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Books Bücher 1 - 2 von 2 in 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  "
Bulletin - Seite 133
1907
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Mining and Metallurgy: Published Monthly by the American ..., Ausgaben 19-24

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 and ..., Band 40

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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