 While the general direction of the crevice is nearly north and south (S. 10° E.), its course is not straight, but zigzags back and forth within certain limits, so that a shaft sunk on a general course of the fissure may be several feet out of the way....  The Proceedings of the Iowa Academy of Science - Pàgina 37per Iowa Academy of Science - 1895Visualització completa - Sobre aquest llibre
 | Iowa Geological Survey - 1897 - 720 pàgines
...feet out of the way. FIQ. 18. Crevlco and shafts at the Lansing lead mine. VERTICAL CREVICE. The sheet has been followed 1,000 feet and its limits have not...by a ravine and the sheet thus outcrops. There is reason for supposing that it will be found again upon the other side. The main body of the sheet has... | |
 | 1897 - 560 pàgines
...out of the way. Fio. 18. Crevice und shafts at the Lansing lead mine. VERTICAL CREVICE. 55 The sheet has been followed 1,000 feet and its limits have not...by a ravine and the sheet thus outcrops. There is reason for supposing that it will be found again upon the other side. The main body of the sheet has... | |
 | Harry Foster Bain - 1906 - 778 pàgines
...general course of the fissure may be several feet out of the way. The sheet has been followed 1 ,000 feet and its limits have not been reached either to...by a ravine and the sheet thus outcrops. There is reason for supposing that it will be found upon the other side. The main body of the "Iowa Oeol. Survey,... | |
 | Geological Survey (U.S.) - 1906 - 222 pàgines
...general course of the fissure may be several feet out of the way. The sheet has been followed 1 ,000 feet and its limits have not been reached either to...by a ravine and the sheet thus outcrops. There is reason for supposing that it will be found upon the other side. The main body of the a Iowa Geol. Survey,... | |
 | Wisconsin Geological and Natural History Survey - 1907 - 192 pàgines
...that a shaft sunk on a general course of the fissure may be several feet out of the way. The sheet has been followed 1,000 feet and its limits have not...by a ravine and the sheet thus outcrops. There is reason for supposing that it will be found upon the other side. The main body of the »Iowa Gcol. Survey,... | |
 | Wisconsin Geological and Natural History Survey - 1907 - 188 pàgines
...out of the way. The sheet has been followed 1,000 feet and its limits have not been reached cither to the north or south . At the north end of the present...the fissure is interrupted by a ravine and the sheet tbus outerops. There is reason for supposing that it will be found upon the other side. The main body... | |
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