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Page 6775, results 169351 - 169375

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Time of travel of water in the Potomac River, Cumberland to Washington
James K. Searcy, Luther C. Davis
1961, Circular 438
This report introduces a graphical procedure for estimating the time required for water to travel down the Potomac River in the reach extending from Cumberland, Md., to Washington, D.C. The time of travel varies with the flow of the river; so the stage of the river at the lower end...
Recharging ground-water reservoirs
George H. Taylor
1961, Open-File Report 60-139
Successful artificial recharge of a ground-water reservoir depends upon many factors. Some factors are very complicated and technical. This paper will deal briefly with some of them. For a more comprehensive description of ground-water reservoirs and their artificial recharge, the publications listed at the end of this paper should be...
Ash-flow tuffs: Their origin, geologic relations, and identification
Clarence S. Ross, Robert L. Smith
1961, Professional Paper 366
Pyroclastic materials, which are interpreted as having been deposited by flowage as a suspension of ash in volcanic gas, are becoming widely recognized as major geologic episodes. These may be unconsolidated, indurated by partial welding, or welded into a compact rock. Many students are working on these materials and the...
Geology of uranium in the Chadron area, Nebraska and South Dakota
Robert Jacob Dunham
1961, Open-File Report 61-42
The Chadron area covers 375 square miles about 25 miles southeast of the Black Hills. Recurrent mild tectonic activity and erosion on the Chadron arch, a compound anticlinal uplift of regional extent, exposed 1900 feet of Upper Cretaceous rocks, mostly marine shale containing pyrite and organic matter, and 600 feet...
Short papers in the geologic and hydrologic sciences; Articles 1-146
Water Resources Division, U.S. Geological Survey
1961, Professional Paper 424-B
The scientific and economic results of work by the United States Geological Survey during the fiscal year 1961, the 12 months ending June 30, 1961, will be summarized in four volumes of which this is the first. This volume includes 146 short papers on a variety of subjects in the...