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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 65,000 articles 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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40Ar/39Ar geochronology of magmatic-steam alunite from Alunite Ridge and Deer Trail Mountain, Marysvale Volcanic Field, Utah: Timing and duration of miocene hydrothermal activity associated with concealed intrusions 40Ar/39Ar geochronology of magmatic-steam alunite from Alunite Ridge and Deer Trail Mountain, Marysvale Volcanic Field, Utah: Timing and duration of miocene hydrothermal activity associated with concealed intrusions
Porphyry and epithermal deposits are important sources of base and precious metals. Most actively mined deposits have been exhumed such that ore bodies are relatively close to the surface and are therefore locatable and economic to extract. Identifying and characterizing concealed deposits, particularly more deeply buried porphyry deposits, represents a far greater challenge for mineral
Authors
Cameron Mark Mercer, M. Cosca, Albert H. Hofstra, Wayne R. Premo, Robert O. Rye, Gary P. Landis
Using fiber-optic distributed temperature sensing in fisheries applications: An example from the Ozark Highlands Using fiber-optic distributed temperature sensing in fisheries applications: An example from the Ozark Highlands
Studies of thermal selection by organisms, including fishes, are common and provide data that are useful for conservation and management. Advances in temperature sensing technology have improved these studies; however, the benefits of new technology (e.g., increased accuracy and greater deployment flexibility) should be carefully considered and compared to disadvantages (e.g., higher...
Authors
Skylar L. Wolf, Dusty A. Swedberg, Evan P. Tanner, Samuel D. Fuhlendorf, Shannon K. Brewer
Preliminary evidence of anticoagulant rodenticide exposure in American kestrels (Falco sparverius) in the western United States Preliminary evidence of anticoagulant rodenticide exposure in American kestrels (Falco sparverius) in the western United States
Although there is extensive evidence of declines in the American Kestrel (Falco sparverius) population across North America, the cause of such declines remains a mystery. One hypothesized driver of decline is anticoagulant rodenticide (AR) exposure, which could potentially cause mortality or reduced fitness. We investigated AR exposure in wild American Kestrels in Utah, USA. We collected...
Authors
Evan R. Buechley, Dave Oleyar, Jesse Watson, Jennifer Bridgeman, Steven Volker, David A. Goldade, Catherine E. Swift, Barnett A. Rattner
Bioavailability of dissolved organic matter varies with anthropogenic landcover in the Upper Mississippi River Basin Bioavailability of dissolved organic matter varies with anthropogenic landcover in the Upper Mississippi River Basin
Anthropogenic conversion of forests and wetlands to agricultural and urban landcovers impacts dissolved organic matter (DOM) within streams draining these catchments. Research on how landcover conversion impacts DOM molecular level composition and bioavailability, however, is lacking. In the Upper Mississippi River Basin (UMRB), water from low-order streams and rivers draining one of...
Authors
Derrick R. Vaughn, Anne M. Kellerman, Kimberly Wickland, Robert G. Striegl, David C. Podgorski, Jon R. Hawkings, Jaap H. Nienhuis, Mark M. Dornblaser, Edward G. Stets, Robert G.M. Spencer
Ordovician geology of Alaska Ordovician geology of Alaska
Ordovician rocks, found in northern, east-central, interior and southern Alaska, formed in a variety of depositional and palaeogeographic settings. Shallow- and deep-water strata deposited along the northwestern Laurentian margin occur in east-central Alaska (Yukon River area) and probably correlative rocks crop out to the north in the Porcupine River area. Ordovician strata elsewhere in...
Authors
Julie A. Dumoulin, Justin V. Strauss, John Repetski
Gaussian process forecasts Pseudogymnoascus destructans will cover coterminous United States by 2030 Gaussian process forecasts Pseudogymnoascus destructans will cover coterminous United States by 2030
White-nose syndrome has been decimating populations of several bat species since its first occurrence in the Northeastern United States in the winter 2006–2007. The spread of the disease has been monitored across the continent through the collaboration of many organizations. Inferring the rate of spread of the disease and predicting its arrival at new locations is critical when assessing...
Authors
Ashton M. Wiens, Wayne E. Thogmartin
Towards a unified drag coefficient formula for quantifying wave energy reduction by salt marshes Towards a unified drag coefficient formula for quantifying wave energy reduction by salt marshes
Coastal regions are susceptible to increasing flood risks amid climate change. Coastal wetlands play an important role in mitigating coastal hazards. Vegetation exerts a drag force to the flow and dampens storm surges and wind waves. The prediction of wave attenuation by vegetation typically relies on a pre-determined drag coefficient CD. Existing CD formulas are subject to vegetation
Authors
Ling Zhu, Q. Chen, Yan Ding, Navid H. Jafari, Hongqing Wang, Bradley D. Johnson
Genetic population structure of cisco, Coregonus artedi, in the Laurentian Great Lakes Genetic population structure of cisco, Coregonus artedi, in the Laurentian Great Lakes
Management of a widely distributed species can be a challenge when management priorities, resource status, and assessment methods vary across jurisdictions. For example, restoration and preservation of coregonine species diversity is a goal of management agencies across the Laurentian Great Lakes. However, management goals and the amount of information available varies across management...
Authors
Wendylee Stott, Daniel L. Yule, Chris L. Davis, Kevin Donner, Mark P. Ebener, Stephen Lenart, Christopher Olds
An extrapolation method for estimating loads from unmonitored areas using watershed model load ratios An extrapolation method for estimating loads from unmonitored areas using watershed model load ratios
It is important to routinely estimate loads from an entire watershed to describe current conditions and evaluate how watershed-wide management efforts have affected the nutrient and sediment export that affect downstream water quality. However, monitoring in most areas, including the Great Lakes watershed, consists of sampling at a limited number of sites that are only periodically used...
Authors
Dale M. Robertson, David A. Saad, Greg F. Koltun
A 1.8 million year history of Amazon vegetation A 1.8 million year history of Amazon vegetation
During the Pleistocene, long-term trends in global climate were controlled by orbital cycles leading to high amplitude glacial-interglacial variability. The history of Amazonian vegetation during this period is largely unknown since no continuous record from the lowland basin extends significantly beyond the last glacial stage. Here we present a paleoenvironmental record spanning the...
Authors
Andrea K. Kern, Thomas K. Akabane, Jaqueline Q. Ferreira, Cristiano M. Chiessi, Debra A. Willard, Fabricio Ferreira, Allan O. Sanders, Cleverson G. Silva, Catherine Rigsby, Francisco W. Cruz, Gary S. Dwyer, Sherilyn C. Fritz, Paul A. Baker
Minimum requirements for publishing hydrogen, carbon, nitrogen, oxygen and sulfur stable-isotope delta results (IUPAC Technical Report) Minimum requirements for publishing hydrogen, carbon, nitrogen, oxygen and sulfur stable-isotope delta results (IUPAC Technical Report)
Stable hydrogen, carbon, nitrogen, oxygen and sulfur (HCNOS) isotope compositions expressed as isotope-delta values are typically reported relative to international standards such as Vienna Standard Mean Ocean Water (VSMOW), Vienna Peedee belemnite (VPDB) or Vienna Cañon Diablo Troilite (VCDT). These international standards are chosen by convention and the calibration methods used to...
Authors
Grzegorz Skrzypek, Colin Allison, J.K. Bohlke, Luana Bontempo, Paul Brewer, Federica Camin, James F. Carter, Michelle M.G. Chartrand, Tyler B. Coplen, Manfred Groning, Jean-Francois Helie, Germain Esquivel-Hernandez, Rebecca Kraft, Dana A. Magdas, Jacqueline L. Mann, Juris Meija, Harro A. J. Meijer, Heiko Moossen, Nives Ogrinc, Matteo Perini, Antonio Possolo, Karyne Rogers, Arndt Schimmelmann, Aldo Shemesh, David X. Soto, Freddy Thomas, Robert Wielgosz, Michael R. Winchester, Zhao Yan, Philip J. H. Dunn
Dynamic material flow analysis of tantalum in the United States from 2002 to 2020 Dynamic material flow analysis of tantalum in the United States from 2002 to 2020
Tantalum has received considerable attention due to risks associated with its supply chain. In 2020 ∼70% of global tantalum supply originated in Africa, with 40% produced in the Democratic Republic of Congo alone. The United States has relied entirely on imports since the 1950s. However, quantifying total domestic consumption is problematic because refined tantalum compounds do not have...
Authors
Abraham J. Padilla, Nedal T. Nassar