 Types of copper deposits of the Southern United States," and in it gave the first detailed account of the geology of the district. Weed, so far as the writer is aware, was the first to recognize the true character of the rocks in which the deposits occur....  Bulletin of the Geological Society of America - Seite 345von Geological Society of America - 1902Vollansicht - Über dieses Buch
 | North Carolina. Department of Conservation and Development - 1916 - 376 Seiten
...recognize the true character of the rocks in which the deposits occur. He says, in this connection :c •'The rocks are all of igneous origin — even the...are cut by dikes of later igneous rock (diabase). . . Apart from the dikes, however, I would say, on the strength of field observations alone, that the... | |
 | 1917 - 244 Seiten
...true character of the rocks in which the deposits occur. He says, in this connection :c "The rocks arc all of igneous origin — even the softest and most...the Thomas mine, where a purplish rock is clearly a porphyriiic meta-andesite. These schists are cut by dikes of later igneous rock (diabase). . . Apart... | |
 | 1917 - 380 Seiten
...recognize the true character of the rocks in which the deposits occur. He says, in this connection :° "The rocks are all of igneous origin — even the...are cut by dikes of later igneous rock (diabase). . . Apart from the dikes, however, I would aay, on the strength of field observations alone, that the... | |
 | Virginia Division of Mineral Resources - 1925 - 706 Seiten
...true character of the rocks in which the deposits occur. He says, in this connection :c "The rocks arc all of igneous origin — even the softest and most...are cut by dikes of later igneous rock (diabase). . . Apart from the dikes, however, I would say, on the strength of field observations alone, that the... | |
 | Virginia. Division of Mineral Resources - 1925 - 762 Seiten
...recognize the true character of the rocks in which the deposits occur. He says, in this connection :c "The rocks are all of igneous origin — even the...mine, where a purplish rock is clearly a porphyritic meta-andcsite. These schists are cut by dikes of later igneous rock (diabase). . . Apart from the dikes,... | |
 | Geological Society of America - 1902 - 726 Seiten
...as follows : "The country- rock is schist, in few places massive enough to be called gneiss. . . . The rocks are all of igneous origin— even the softest and most shah' show this character in thin sections under the microscope. But in a few instances only is the... | |
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