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At least 1,621 records · Page 90Linked to original sources
USGS1961

Gravity survey in the eastern Snake River Plain, Idaho — A progress report

A regional gravity survey in the eastern Snake River Plain was conducted in the early summer of 1961. Seven hundred and seven gravity stations were established between latitudes 42°15'N and 44°30'N between longitudes 111°30'W and 114°30'W. Three hundred and twenty-five of these stations were located in 2,700 square miles of the eastern part with an average density of one station per 8.3 square miles. The remaining 9,300 square miles were covered by several lines, with an average lineal density of one station per 2.0 miles. A simple-Bouguer gravity contour map has been made of the area by standard methods. The low gravity relief and broad high of the eastern Snake River Plain strongly contrasts with the high amplitude anomalies of the western plain. The major anomalies of the eastern plain consist of 1) a broad high, which is an extension of the large gravity highs of the western plain, 2) a set of elongated alternating lows and highs that trend normal to the axis of the eastern plain, 3) a series of small, local highs on the boundary of the plain, and 4) a prominent low centered over Mud Lake in the northern part of the surveyed area. The basalts of the eastern plain have probably filled troughs or valleys in an undulating subsurface floor rather than a large regional graben.

Idaho↗
USGS1963

Report on the operation of Barnaby, summer, 1948

Barnaby is a self-contained truck-mounted unit for gamma-ray logging of diamond drillholes less than 200 feet deep. The radiation is detected by Geiger-Muller counter and the impulses are transmitted up a single-conductor shielded cable by a special circuit. At the surface the impulses are electronically counted and the average counting rate is automatically plotted by a recording meter synchronized with the advance of the G-M counter in the hole. Barnaby was designed and built for the Union Mines Development Corp. by Robert J. Smith and the writer in the spring of 1945 at the shops of the Metallurgical Laboratories, University of Chicago.

Open-File Report↗