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A cross-section plotting program (CSPP) for gridded (map) data
Richard B. Wells, Charles R. Faust, James W. Mercer
1976, Open-File Report 76-689
A FORTRAN program that prepares the Calcomp plotter tape for drawing cross-sections from gridded map data is described and documented. The program accepts gridded data of the form Z(x,y), where Z is the value at the grid intersection, (x,y). Up to 10 sets of Z(x,y) data for a given grid...
Preliminary evaluation of the feasibility of artificial recharge in northern Qater
John Vecchioli
1976, Open-File Report 76-540
Fresh ground water in northern Qatar occurs as a lens in limestone and dolomite of Eocene age. Natural recharge from precipitation averages 17x106 cubic metres per year whereas current discharge averages 26.6x106 cubic metres per year. Depletion of storage is accompanied by a deterioration in quality due to encroachment of...
Stratigraphy and petroleum possibilities of lower Upper Devonian (Frasnian and lower Famennian) strata, Southwestern Utah
Edward J. Biller
1976, Open-File Report 76-343
The lower Upper Devonian rocks in southwestern Utah--the Guilmette Formation and equivalents--represent a final regressive pulse of the major Late Devonian marine inundation of the Western Interior of the United States and record marine carbonate deposition on a wide continental shelf. They consist primarily of limestone, dolomite, and quartz arenite...
Documentation of finite-difference model for simulation of three-dimensional ground-water flow
Peter C. Trescott, S. P. Larson
1976, Open-File Report 76-591
User experience has indicated that the documentation of the model of three-dimensional ground-water flow (Trescott and Larson, 1975) should be expanded. This supplement is intended to fulfill that need. The original report emphasized the theory of the strongly implicit procedure, instructions for using the groundwater-flow model, and practical considerations for...
Oxalic-acid leaching of rock, soil, and stream-sediment samples as an anomaly-accentuated technique
Henry V. Alminas, Elwin L. Mosier
1976, Open-File Report 76-275
In many instances total-rock and sieved-soil and stream-sediment samples lack the sensitivity and contrast required for reconnaissance exploration and necessary in the search for blind ore deposits. Heavy-mineral concentrates incorporate the required sensitivity and contrast but are overly expensive for two reasons: time-consuming sample preparation is required to obtain them,...
Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Chandalar and Wiseman quadrangles, Alaska
Edward Huntington Cobb
1976, Open-File Report 76-340
These summaries of references are designed to aid in library research on metallic and nonmetallic (other than mineral fuels and construction materials) mineral occurrences in the Chandalar and Wiseman quadrangles in the southern Brooks Range, Alaska. All references to reports of the Geological Survey, to most reports of the U.S....
Flood frequency: expected and unexpected probabilities
D. M. Thomas
1976, Open-File Report 76-775
Flood-frequency curves may be defined either with or without an ' expeced probability ' adustment; and the two curves differ in the way that they attempt to average the time-sampling uncertainties. A curve with no adustment is shown to estimate a median value of both discharge and frequency of occurrence,...