 No. 2I«, 1!X», pp. 321-334. strong contrast with the irregular, roughly dissected topography of the coal fields. The valley topography is characterized by long, narrow, canoeshaped troughs, in general parallel to each other and separated by well-defined...  Bulletin of the United States Geological Survey - Page 129by Geological Survey (U.S.) - 1907Full view - About this book
 | Geology - 1907 - 1026 pages
...in tho lirookwcxxl quadrangle, Al:ilmui»: Hull. I'. S. (iccil. Survey No. 2M), 1905, pp. a>l-334. strong contrast with the irregular, roughly dissected...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... | |
 | Geology, Economic - 1907 - 532 pages
...oBurchard, EF, Iron ores in the Brookwood quadrangle, Alabama: Bull. US Geol. Survey No. 2I«, 1!X», pp. 321-334. strong contrast with the irregular, roughly...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... | |
 | Mineral industries - 1908 - 1244 pages
...Ensley, and Bessemer dermtheir iron-ores. It lies within the valley-region of north-central Alabama. The valley topography is characterized by long, narrow,...separated by well-defined ridges. The trend of the troughs is approximately N. 30° E. Their form is directly dependent on the geologic structure and... | |
 | Education - 1928 - 174 pages
...underlying rocks, has an important bearing on the settlement and industrial development of the district. The valley topography is characterized by long, narrow,...by well-defined ridges. The trend of the valleys is N. 30° to N. 40° E., and their form is directly dependent on the structure and hardness of the underlying... | |
 | Mineral industries - 1908 - 698 pages
...Ensley, and Bessemer derive their iron-ores. It lies within the valley-region of north-central Alabama. The valley topography is characterized by long, narrow,...canoe-shaped troughs, in general parallel to each other ;•• • '!•!.•..:•.• T •'• ! f IS.. If .*».. • i -• N :•• I. T ••!••••••••... | |
 | United States - 1907 - 1200 pages
...is in " Bun-hard. EF, Iron ores in the Brookwood quadrangle. Alabama: Bull. IT. 8. Oeol. Survey So. 260, 1905, pp. 321-334. strong contrast with the irregular,...The trend of the valleys is approximately N. 30° K. Their form is directly dependent on the geologic structure and lithology of the underlying rocks.... | |
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