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184904 results.

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Page 6627, results 165651 - 165675

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Veins in the northern part of the Boulder batholith, Montana
D. M. Pinckney
1965, Open-File Report 65-123
About 20 miles north of Butte and extending nearly to Helena, is an area of 350 square miles containing hundreds of veins and altered zones. The bedrock of the area is 1) late Cretaceous volcanic rocks, forerunners of the Boulder batholith, 2) the Boulder batholith of late Cretaceous to early...
Field determination of nanogram quantities of mercury in soils and rocks
Margaret Hinkle, Kam Wo Leong, F. N. Ward
1965, Open-File Report 65-71
A method for determining nanogram quantities of mercury in geological materials is based on the catalytic effect of mercury on the reaction of ferrocyanide with nitrosobenzene to produce a violet-covered compound whose intensity if proportional to the mercury present. The mercury is released by heating a sample of soil or...
Water resources of the Humboldt River Valley near Winnemucca, Nevada
Philip M. Cohen
1965, Water Supply Paper 1795
This report, resulting from studies made by the U.S. Geological Survey as part of the interagency Humboldt River Research Project, describes the qualitative and quantitative relations among the components of the hydrologic system in the Winnemucca Reach of the Humboldt River valley. The area studied includes the segment of the...
Density comparison method for the measurement of isotopic variations in prepared waters
Joseph Howard McCarthy Jr., Thomas Seward Lovering, Herbert Williams Lakin
1965, Open-File Report 65-103
The falling-drop method of density determination has been modified so that the densities of a standard and a sample water are compared simultaneously. A constant temperature bath that does not vary more than 0.0001°C and an accurate double micropipet are described. The method has sufficient sensitivity and precision to distinguish...
Geology and ground-water resources of the Two Medicine unit and adjacent areas, Blackfeet Indian Reservation, Montana, with a section on chemical quality of water
Q.F. Paulson, Tom V. Zimmerman, Russell H. Langford
1965, Open-File Report 65-117
The Two Medicine Irrigation Unit, on the Blackfeet Indian Reservation of northern Montana, is irrigated by water diverted from Two Medicine Creek. Waterlogging because of overapplication of water and locally inadequate subsurface drainage is a serious problem. This study was undertaken by the U.S. Geological Survey in cooperation with the...