Book Chapters
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: 6063
Why the Mayan cities of the Peten District, Guatemala, were abandoned
No abstract available.
Authors
Charles Wythe Cooke
Primary structures in dune sand and their significance
No abstract available.
Authors
Edwin D. McKee
Geology of the Shati Valley Area iron deposit; Fezzan, Libyan Arab Republic
No abstract available.
Authors
G.H. Goudarzi
Minor elements in water
A complete characterization of natural waters includes a determination of the concentrations of 30 or more minor elements. Emission spectrochemical methods are uniquely suited to the determination of a comparatively large number of minor elements, mainly those classified as heavy metals. Spectro-chemical data published by Braidech and Emory in 1935 and more recent data by Durfor and Becker, and by
Authors
Marvin W. Skougstad
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 the environ
Authors
Helen L. Cannon, Barbara M. Anderson
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 in the sa
Authors
John P. Lockwood
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 formed by re
Authors
Harry A. Tourtelot
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 States has been
Authors
Barbara M. Anderson
Evaluation of a hand-reared mallard release program in Maryland
No abstract available.
Authors
Vernon D. Stotts, A. D. Geis, G.V. Burger