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This article discusses the results of a controlled field testing program, which indicated that definite hydraulic and other advantages may be gained from induced recharging as practiced at Kalamazoo, Michigan. Results include the following: water levels and artesian pressures can be maintained at high stages, the results are lower pumping...

In 1961 a 1000-foot drill hole near Harwich on Cape Cod, Massachusetts, penetrated 435 feet of Pleistocene deposits above 50 to 60 feet of crystalline limestone and phyllitic schist, and more than 500 feet of phyllitic schist with abundant quartz veins. Similar rock is known in the Pennsylvanian and Precambrian...

In the Balmat area in northern New York, tabular deposits of sulfide minerals parallel the layering in folded, siliceous magnesian marbles of a metamorphic complex commonly referred to as the Precambrian Granville Series. Sphalerite, pyrite, and, locally, pyrrhotite and galena have replaced the carbonate minerals in parts of the marble units. The contacts...

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A statistical analysis is made of the sequences of annual tree ring widths and indices. The expected value of growth during any year is shown to be proportional to the standard deviation of the growth, so that the coefficient of variation is a measure of the sensitivity of the growth of a <span...

Precise measurements of fluctuations of ground-water temperature based on monthly readings in shallow glacial-outwash aquifers may be used to study ground-water movement and recharge. An increase in storage in the shallow basin of Okabena Lake, Worthington, Minnesota, permits the water to cover a much larger area and probably increases the opportunity for infiltration of...

A prominent aeromagnetic anomaly in Randolph County, Indiana, suggests the existence of a dikelike structure within the Precambrian basement rocks. Because of the ambiguity inherent in magnetic interpretation, a unique solution for the parameters involved (depth of burial, geometric configuration, and magnetic susceptibility of the mass producing the anomaly) is impossible. However, if one of the <span...

In 1958 the U.S. Geological Survey and the U.S. Weather Bureau jointly conducted a study of tritium fallout distribution over the continental United States, Alaska, and Puerto Rico. The observation period extended from early April to late July in most areas. While this was insufficient to cover the decay side of the...

A contour map of the Precambrian surface for a part of northeastern New Mexico has been prepared from aeromagnetic, gravity, and drill-hole data. The area extends approximately from the Colorado border south to latitude34° N., and from the foothills of the Sangre de Cristo Mountains east to longitude 104° W. Thirty-seven...

As reported in the Transactions of March 1961 (p. 96), the ad hoc Panel on Hydrology convened to report on ways of stimulating research in scientific hydrology, recommended a program of international cooperation in hydrology—more specifically a plan for an ‘International Decade for Hydrology,’ as drawn for the Panel by R. L. Nace....

Some recent paleogeographic maps indicate that central Idaho was part of a major geosyncline throughout Paleozoic time. This concept, apparently based on thick marine accumulations far apart on the margins of the region, is inconsistent with field data. Within the area of the Idaho batholith, Permian(?) volcanic rocks rest either on batholithic rocks...

In a study of the relationship of magnetic anomalies to the magnetite content and structure of layered Precambrian iron-formations, the effective induced and remanent magnetizations of the Biwabik iron-formation were determined by analyses of aeromagnetic anomalies recorded 1,000 ft above the Biwabik in areas of known geology. The induced magnetization along the layers is relatively insignificant...

Both the dipole and nondipole components of the present geomagnetic field are analyzed by calculating the orientation of hypothetical geocentric dipoles which, if acting alone, would produce the present geomagnetic field as observed at points on a grid covering the earth at 10° intervals. The dispersion in direction of these virtual geomagnetic poles...

Measurements of erosion on miniature pediments in Badlands National Monument, South Dakota, show that during almost eight years, the pediments were lowered by sheetwash. The adjacent hillslopes have retreated leaving a belt of newly formed pediment from 6 to 12 cm wide at their bases. The hillslopes are rough and relatively permeable; the <span...

Landslide blocks of latest Oligocene or earliest Miocene age are preserved at several localities in northwestern South Dakota and southeastern Montana. These tilted blocks contain Late Cretaceous to late Oligocene rocks and are unconformably overlain by nearly horizontal strata of the Arikaree Formation of Miocene age. Undisturbed rocks of late Oligocene...

The agent of lymphocystis disease has been propagated under laboratory conditions for more than 2 years. Although several hatchery-propagated centrarchids are susceptible, the bluegill (Lepomis macrochirus) is the host of choice because it is most easily maintained. At 12.5° the disease was transmitted by implantation and by injection, but there...

A small landslide block left a trail about 81 meters long on an 11½-degree slope in the Tuxer Voralpen, Austria. The movement is explained in terms of fluid pressure mechanics; hypothetically, the requisite pore pressure was caused by the loading of contiguous saturated segments of the slide path during rapid...

Electrical conductivity has been widely used in freshwater research but usual methods employed by limnologists for converting measurements to conductance at a given temperature have not given uniformly accurate results. The temperature coefficient used to adjust conductivity of natural waters to a given temperature varies depending on the kinds...

An established line of fish cells has been propagated in vitro for 21 months and 48 subcultivations. Important characteristics of the cells are described....

Glass electrodes suitable for measurement of divalent cations have been made and tested. Empirical and theoretical electrode equations have been presented to describe electrode behavior in a variety of aqueous solutions. Most electrodes show response interpretable as showing nearly ideal solid-solution behavior of the cations in the glass surface. The...