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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.
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Environmental hazards of aluminum to plants, invertebrates, fish, and wildlife
Aluminum (Al) is the third most common mineral and the most common metal in Earth’s crust, accounting for approximately 8.1% of the crust by weight. Thus, it cannot be considered a contaminant in the usual sense of the word. However, despite its near omnipresence throughout the world, Al has been of major concern as a primary limiting factor to cultivated plants for several decades. In much of the
Authors
D. W. Sparling, T. P. Lowe
Exsolved magmatic fluid and its role in the formation of comb-layered quartz at the Cretaceous Logtung W-Mo deposit, Yukon Territory, Canada
Comb-layered quartz is a type of unidirectional solidification texture found at the roofs of shallow silicic intrusions that are often associated spatially with Mo and W mineralisation. The texture consists of multiple layers of euhedral, prismatic quartz crystals (Type I) that have grown on subplanar aplite substrates. The layers are separated by porphyritic aplite containing equant phenocrysts o
Authors
Jacob B. Lowenstern, W. David Sinclair
Colloidal-facilitated transport of inorganic contaminants in ground water: part 1, sampling considerations
Investigations at Pinal Creek, Arizona, evaluated routine sampling procedures for determination of aqueous inorganic geochemistry and assessment of contaminant transport by colloidal mobility. Sampling variables included pump type and flow rate, collection under air or nitrogen, and filter pore diameter. During well purging and sample collection, suspended particle size and number as well as disso
Authors
Robert W. Puls, James H. Eychaner, Robert M. Powell
Assessments and scientific basis for management options. Status of amphibians.
No abstract available.
Authors
M.R. Jennings
Evidence for Mesoproterozoic basement in the Carolina terrane and speculations on its origin
No abstract available.
Authors
Paul A. Mueller, Marianne Kozuch, Ann L. Heatherington, Joseph L. Wooden, Terry W. Offield, Robert P. Koeppen, Terry L. Klein, Allen P. Nutman
Benthic processes in South San Francisco Bay: The role of organic inputs and bioturbation
No abstract available.
Authors
J.M. Caffrey, Douglas E. Hammond, James S. Kuwabara, L.G. Miller, R.R. Twilley
Dimethylsulfoniopropionate as a potential methanogenic substrate in Mono Lake sediments
A high concentration of dimethylsulfoniopropionate (DMSP) was found in the water column (0.1–1.8 µM particulate plus dissolved) of Mono Lake, CA, an alkaline, hypersaline waterbody. The dense Artemia monica population contained high levels of DMSP (1.7–2.5 mmol.g-1 wet weight), presumably as an osmolyte. Death of these brine shrimp caused accumulation of DMSP along the shoreline of the lake, where
Authors
P.T. Visscher, J.R. Guidetti, Charles W. Culbertson, Ronald S. Oremland
A hypothesized Manson impact tsunami: Paleomagnetic and stratigraphic evidence in the Crow Creek Member, Pierre Shale
No abstract available.
Authors
Maureen B. Steiner, Eugene Merle Shoemaker
Tests of detachment fault models using Miocene syntectonic strata, Colorado River extensional corridor, southeastern California and west-central Arizona
No abstract available.
Authors
Kathi K. Beratan, Jane E. Nielson
Microbial cycling of methyl bromide
Environmental concern about brominated halocarbons like methyl bromide (MeBr) is focused on their potential to destroy stratospheric ozone. Photocatalysis of MeBr and other halocarbons in the stratosphere results in the liberation of reactive CI and Br atoms. Because Br atoms are perhaps as much as 100-fold more efficient at attacking ozone than are CI atoms, bromine’s lower abundance is partly co
Authors
Ronald S. Oremland
The supply and carbon content of suspended sediment from the Sacramento River to San Francisco Bay: Carbon and nitrogen concentrations and transports
No abstract available.
Authors
Laurence E. Schemel, S. Hager, D. Childers