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A microcomputer-based data acquisition and control system for the direct shear, ring shear, triaxial shear, and consolidation tests
Philip S. Powers
1983, Open-File Report 83-491
This report is intended to provide internal documentation for the U.S. Geological Survey laboratory's automatic data acquisition system. The operating procedures for each type of test are designed to independently lead a first-time user through the various stages of using the computer to control the test. Continuing advances in computer...
In situ geomechanics of crystalline and sedimentary rocks; Part IV, continued field testing of the modified U.S. Geological Survey 3-D borehole stress probe
Thomas C. Nichols
1983, Open-File Report 83-750
Two modified and calibrated U.S. Geological Survey 3-D borehole probes were successfully tested in the field at a site on South Table Mountain, near Golden, Colo. The probes were installed in separate core holes at depths of 84 and 99 cm in the latite cap rock and subsequently stress relieved...
Compilation of revised ages of volcanic units in the San Juan Mountains, Colorado; recalculated K-Ar age determinations using IUGS constants
Ken Hon, Harald H. Mehnert
1983, Open-File Report 83-668
Previously published K-Ar age determinations for the middle to late Tertiary San Juan volcanic field have been recalculated using the 1977 IUGS constants. Revised ages, original analytical data, and brief sample descriptions are presented in table 2 for all available dated volcanic units. A generalized stratigraphic column is also included...
Estimation of nonpoint sources of phosphorus for lakes in the Puget Sound region, Washington
Robert J. Gilliom
1983, Open-File Report 82-161
Control of eutrophication of lakes in watersheds undergoing development is facilitated by estimates of the amounts of phosphorus (P) that reach the lakes from areas under various types of land use. Using a mass-balance model, the writer calculated P loadings from present-day P concentrations measured in lake water and from...
Reconnaissance geology of the Thaniyah Quadrangle, sheet 20/42 C, Kingdom of Saudi Arabia
Robert C. Greene
1983, Open-File Report 83-448
The Thaniyah quadrangle, sheet 20/42 C, is located in the transition zone between the Hijaz Mountains and the Najd Plateau of southwestern Saudi Arabia between lat 20?00' and 20?30' N., long 42?00' to 42?30' E. The quadrangle is underlain by Precambrian metavolcanic, metasedimentary, plutonic, and dike rocks. Metavolcanic rocks consist...
Ground-water data for selected coal areas in western North Dakota
James D. Wald, Steven W. Norbeck
1983, Open-File Report 83-219
Ground-water data are provided in this report for the Sand Creek-Hanks, New England-Mott, Dickinson, and Bowman-Gascoyne coal areas, western North Dakota. The report contains the following: (1) Maps showing the location of wells, springs, and test holes; the location of wells and test holes where drillers' logs are available; and...