Science, Том 23John Michels (Journalist) American Association for the Advancement of Science, 1894 Since Jan. 1901 the official proceedings and most of the papers of the American Association for the Advancement of Science have been included in Science. |
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Стр. 23
... occur ; the softer rocks are therefore swept away , and the iron de- posits remain upon elevated plateaus or buttes . " Mr. Johnson also appears to have recognized the ex- istence of the extensive deposits of conglomerate ores , but of ...
... occur ; the softer rocks are therefore swept away , and the iron de- posits remain upon elevated plateaus or buttes . " Mr. Johnson also appears to have recognized the ex- istence of the extensive deposits of conglomerate ores , but of ...
Стр. 24
... occur scattered everywhere throughout this region . The yellow sand with its contained nodules occurs capping many ... occur promiscuously scattered over the face of the country , but usually occur in pockets or irregular deposits and at ...
... occur scattered everywhere throughout this region . The yellow sand with its contained nodules occurs capping many ... occur promiscuously scattered over the face of the country , but usually occur in pockets or irregular deposits and at ...
Стр. 32
... occur , afford evidence that these rocks are simply alteration products of the gran- ites . They might be termed " hornblendic felstones . Types of these rocks have been noticed as patches or masses included in the bedding of alteration ...
... occur , afford evidence that these rocks are simply alteration products of the gran- ites . They might be termed " hornblendic felstones . Types of these rocks have been noticed as patches or masses included in the bedding of alteration ...
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Meeting of the Iowa Academy of Sciences | 10 |
ROUGHING IT WITH AN ECLIPSE PARTY | 42 |
ESTERBROOKS | 56 |
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