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Page 7185, results 179601 - 179625

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Outlook for further ore discoveries in the Little Hatchet Mountains, New Mexico
Samuel Grossman Lasky
1938, Economic Geology (33) 365-389
The Little Hatchet Mountains contain two mining districts, the Eureka silver-lead-zinc district and the Sylvanite gold district, the deposits of each being associated with a mass of monzonite that intrudes Lower Cretaceous sediments. The same formations crop out in both districts, having been duplicated by a large post-ore fault, and...
Third special report of the Hawaiian Volcano Observatory of Hawaii National Park and the Hawaiian Volcano Research Association: Ash formations of the island Hawaii
Chester K. Wentworth
1938, Report
The purpose of the study was to determine the areal extent of the various volcanic ash formations, to describe them petrographically and to develop means of discriminating them. The ash formations, long known in a general way, had been only casually observed by geologists. Their interpretation and separation from other...
Fifty-ninth annual report of the Director of the Geological Survey
Walter Curran Mendenhall
1938, Annual Report 59
Basically important in the general program of conservation and development were the results of the Geological Survey's work during the fiscal year 1938. Investigations of the Nation's mineral and water supplies were conducted with all possible vigor and dispatch, thousands of square miles were surveyed for topographic maps, and technical...