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Water levels and artesian pressures in observation wells in the United States in 1938
No abstract available.
Authors
O. E. Meinzer, L.K. Wenzel
Water utilization in the basin of South Umpqua River, Oregon
No abstract available.
Authors
R.O. Helland
The significance and nature of the cone of depression in ground-water bodies
In nature the hydraulic system in an aquifer is in balance; the discharge is equal to the recharge and the water table or other piezometric surface is more or less fixed in position. Discharge by wells is a new discharge superimposed on the previous system. Before a new equilibrium can be established water levels must fall throughout the aquifer to an extent sufficient to reduce the natural discha
Authors
Charles V. Theis
Sulphate minerals of the Comstock Lode, Nevada
Seventeen representative samples of supergene sulphates from old workings on the Comstock Lode are described. They range from simple minerals such as gypsum and epsomite to complex aggregates of four or more distinct species. All are well known species except a mineral of the copper (chalcanthite) or magnesium sulphate pentahydrate group, with about half the magnesium replaced by copper, zinc, fer
Authors
C. Milton, W. D. Johnston
Dolomite and jasperoid in the Metaline District, northeastern Washington
The replacement ore bodies of the Metaline zinc-lead district, in northeastern Washington are limited to the greatly disturbed fault block through which the Pend Oreille River flows and are associated with the major faults but are not in them. They are mostly near the top of the Metaline limestone, of Middle Cambrian age, and below black Ordovician slate. The ores are generally in jasperoid and ar
Authors
Charles Frederick Park
Botulism, a recurring hazard to waterfowl: with notes on recent outbreaks in the United States and Canada, and Australia
No abstract available.
Authors
E.R. Kalmbach
The coordination of mosquito control with wildlife conservation
No abstract available.
Authors
Clarence Cottam
Volcanic activity at Magnet Cove, Arkansas
The igneous rocks and the minerals of Magnet Cove, Arkansas, have long interested geologists and mineralogists, but in much of the area rock‐exposures are so sparse that many of the geologic, relations have remained obscure. However, recent prospecting and the mining of titanium ores have uncovered rocks that throw new light on the geology of the region. The regional rocks of the area are sandston
Authors
C. S. Ross
Igneous activity in the Comstock District, Nevada
The oldest igneous rocks in the Comstock District are amphibolites probably derived from basalts and of Triassic age. These are intruded by pre‐Tertiary quartz monzonlte and by granodiorite of Sierran facies, the latter not being exposed on the surface but found on mine‐dumps. Igneous activity recorded mainly in volcanic rocks was almost continuous throughout the Tertiary. Its products, in order o
Authors
F. C. Calkins
Diabase dikes of the Franklin Furnace, New Jersey, quadrangle
Two of the numerous small dikes mapped on the areal geology sheet of the Franklin Furnace Folio (U.S. Geological Survey 161) as “Mostly basic, including nepheline tinguaite, leucite tinguaite, and camptonite” of post‐Ordovician age, have been found to be quite distinct from these alkalic rocks, and the two dikes in question are indistinguishable from the Triassic diabase found elsewhere in New Jer
Authors
C. Milton