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Science Quality and Integrity
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 5,500 book chapters authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
Filter Total Items: 6153
The geochemist’s involvement with the pollution problem The geochemist’s involvement with the pollution problem
The geochemist can contribute much information of value toward assessing the effect of environment, including inorganic pollution, on health. The average composition of rocks, soils, plants, and water and also the increments of inorganic substances that can be expected in geologic environments of high-metal content are essential for comparison with metal contents of these components of...
Authors
Helen L. Cannon, Barbara M. Anderson
Detrital serpentinite from the Guajira Peninsula, Colombia Detrital serpentinite from the Guajira Peninsula, Colombia
Small lenses of detrital serpentinite, completely surrounded by massive serpentinite, occur within a sequence of Mesozoic phyllites and metasiltstones in the Cerros de Parashi area, Guajira Peninsula. These lenses, which are as much as 30 m thick, consist of poorly sorted breccias that grade irregularly upward into bedded serpentinite sandstone and shale. Graded bedding is well developed...
Authors
John P. Lockwood
Chemical compositions of rock types as factors in our environment Chemical compositions of rock types as factors in our environment
The types of rocks that form geologic units in the Earth’s crust supply most of the raw materials from which soils are formed and from which water derives its inorganic constituents. The compositions of what we eat and drink thus depend in part upon the compositions of the source rocks. Igneous rocks are formed by crystallization and solidification of a rock melt. Metamorphic rocks are...
Authors
Harry A. Tourtelot
Calcium-Carbonate hardness of public water supplies in the conterminous United States Calcium-Carbonate hardness of public water supplies in the conterminous United States
Geographic variations in the hardness of water seem to parallel the geographic variations in certain cardiovascular diseases (Anderson and others, 1969; Biorck and others, 1965; Schroeder, 1966). Winton and McCabe (1970) have provided a recent review of the problem. The map, presented here, showing calcium-carbonate hardness of municipal raw-water sources in the conterminous United...
Authors
Barbara M. Anderson
Evaluation of a hand-reared mallard release program in Maryland Evaluation of a hand-reared mallard release program in Maryland
No abstract available.
Authors
Vernon D. Stotts, A. D. Geis, G.V. Burger
Inland fisheries Inland fisheries
Today's inland commercial fisheries are small independent operational units widely dispersed on lakes, impoundments, and streams throughout the vast central plains. The problems of the fisheries are diverse and unique to local conditions. Inland fisheries are particularly important to the Nation in times of international conflict because they are distributed throughout the area and the...
Authors
Louella E. Cable
Petroleum possibilities of Yukon-Koyukuk Province, Alaska: region 1 Petroleum possibilities of Yukon-Koyukuk Province, Alaska: region 1
The Yukon-Koyukuk province covers 100,000 sq mi (259,000 sq km) along the west coast of Alaska, extending from the Brooks Range to the Yukon delta, but excluding the Seward Peninsula. It is essentially a vast tract of Cretaceous rocks locally veneered by Quaternary alluviated beds and volcanic rocks. The Cretaceous section contains a large volume of volcanic rocks, and most of the...
Authors
William W. Patton
Polychlorinated biphenyl interference in pesticide residue analysis Polychlorinated biphenyl interference in pesticide residue analysis
No abstract available.
Authors
W. L. Reichel
Population and harvest surveys Population and harvest surveys
No abstract available.
Authors
A. D. Geis