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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.
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 82,000 reports 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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Climate changes, shifting ranges Climate changes, shifting ranges
Even a fleeting mention of the Everglades conjures colorful images of alligators, panthers, flamingos, and manatees. Over the centuries, this familiar cast of characters has become synonymous with life in south Florida. But the workings of a changing climate have the potential to significantly alter the menagerie of animals that call this area home. Global projections suggest south...
Authors
Stephanie S. Romanach
Countrywide digital elevation models for the Islamic Republic of Mauritania—SRTM and ASTER (phase V, deliverable 65) Countrywide digital elevation models for the Islamic Republic of Mauritania—SRTM and ASTER (phase V, deliverable 65)
A digital elevation model (DEM) of the entire country of the Islamic Republic of Mauritania was produced using Shuttle Radar Topography Mission (SRTM) data as required for deliverable 65 of the contract. In addition, because of significant recent advancements of availability, seamlessness, and validity of Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) global...
Authors
Gregory K. Lee
Crystalline basement map of Mauritania derived from filtered aeromagnetic data (deliverable 54_1), Aeromagnetic and geological structure map of Mauritania (phase V, deliverable 54_2), Maximum depth to basement map of Mauritania derived from Euler analysis Crystalline basement map of Mauritania derived from filtered aeromagnetic data (deliverable 54_1), Aeromagnetic and geological structure map of Mauritania (phase V, deliverable 54_2), Maximum depth to basement map of Mauritania derived from Euler analysis
In 1996, at the request of the Government of the Islamic Republic of Mauritania, a team of U.S. Geological Survey (USGS) scientists produced a strategic plan for the acquisition, improvement and modernization of multidisciplinary sets of data to support the growth of the Mauritanian minerals sector and to highlight the geological and mineral exploration potential of the country. In 1999...
Authors
Carol A. Finn, John D. Horton
Database compilation for the geologic map of the San Francisco volcanic field, north-central Arizona Database compilation for the geologic map of the San Francisco volcanic field, north-central Arizona
The main component of this publication is a geologic map database prepared using geographic information system (GIS) applications. The geodatabase of geologic points, lines, and polygons was produced as a compilation from five adjoining map sections originally published as printed maps in 1987 (see references in metadata). Four of the sections (U.S. Geological Survey Miscellaneous Field...
Authors
Joseph A. Bard, David W. Ramsey, Edward W. Wolfe, George E. Ulrich, Christopher G. Newhall, Richard B. Moore, Norman G. Bailey, Richard F. Holm
Database creation, data quality assessment, and geochemical maps (phase V, deliverable 59)—Final report on compilation and validation of geochemical data Database creation, data quality assessment, and geochemical maps (phase V, deliverable 59)—Final report on compilation and validation of geochemical data
Under the World Bank-funded Second Projet de Renforcement Institutionnel du Secteur Minier de la Republique Islamique de Mauritanie (PRISM-II), this Phase V geochemistry report follows earlier Phase I and Phase II summary reports on geochemical data (U.S. Geological Survey, 2007 and Eppinger, 2007; respectively). All the reports are based on evaluations of geochemical data collected in...
Authors
Robert G. Eppinger, Stuart A. Giles, Gregory K. Lee, Steven M. Smith
Database of mineral deposits in the Islamic Republic of Mauritania (phase V, deliverables 90 and 91) Database of mineral deposits in the Islamic Republic of Mauritania (phase V, deliverables 90 and 91)
Three ore deposits databases from previous studies were evaluated and combined with new known mineral occurrences into one database, which can now be used to manage information about the known mineral occurrences of Mauritania. The Microsoft Access 2010 database opens with the list of tables and forms held within the database and a Switchboard control panel from which to easily navigate...
Authors
Erin E. Marsh, Eric D. Anderson
Decision analysis to support development of the Glen Canyon Dam long-term experimental and management plan Decision analysis to support development of the Glen Canyon Dam long-term experimental and management plan
The U.S. Geological Survey, in cooperation with the Bureau of Reclamation, National Park Service, and Argonne National Laboratory, completed a decision analysis to use in the evaluation of alternatives in the Environmental Impact Statement concerning the long-term management of water releases from Glen Canyon Dam and associated management activities. Two primary decision analysis methods
Authors
Michael C. Runge, Kirk E. LaGory, Kendra Russell, Janet R. Balsom, R. Alan Butler, Coggins, Katrina A. Grantz, John Hayse, Ihor Hlohowskyj, Josh Korman, James E. May, Daniel J. O’Rourke, Leslie A. Poch, James R. Prairie, Jack C. VanKuiken, Robert A. Van Lonkhuyzen, David R. Varyu, Bruce T. Verhaaren, Thomas D. Veselka, Nicholas T. Williams, Kelsey K. Wuthrich, Charles B. Yackulic, Robert P. Billerbeck, Glen W. Knowles
Deep-Water Acoustic Anomalies from Methane Hydrate in the Bering Sea Deep-Water Acoustic Anomalies from Methane Hydrate in the Bering Sea
A recent expedition to the central Bering Sea, one of the most remote locations in the world, has yielded observations confirming gas and gas hydrates in this deep ocean basin. Significant sound speed anomalies found using inversion of pre-stack seismic data are observed in association with variable seismic amplitude anomalies in the thick sediment column. The anomalously low sound...
Authors
Warren T. Wood, Ginger A. Barth, David W. Scholl, Nina Lebedeva-Ivanova
Detecting sea-level hazards: Simple regression-based methods for calculating the acceleration of sea level Detecting sea-level hazards: Simple regression-based methods for calculating the acceleration of sea level
This report documents the development of statistical tools used to quantify the hazard presented by the response of sea-level elevation to natural or anthropogenic changes in climate and ocean circulation. A hazard is a physical process (or processes) that, when combined with vulnerability (or susceptibility to the hazard), results in risk. This study presents the development and...
Authors
Kara S. Doran, Peter A. Howd, Sallenger
Draft comprehensive conservation plan and environmental impact statement-Rocky Mountain Arsenal National Wildlife Refuge Draft comprehensive conservation plan and environmental impact statement-Rocky Mountain Arsenal National Wildlife Refuge
The Rocky Mountain Arsenal National Wildlife Refuge Complex, consisting of some of the newer properties in the National Wildlife Refuge System, is a work in progress. Offering unique assets to surrounding communities, these lands promise to become some of the premier urban wildlife refuges in the country. At the heart of the refuge complex is the Rocky Mountain Arsenal National Wildlife...
Authors
Dynamic reserve design in the face of climate change and urbanization Dynamic reserve design in the face of climate change and urbanization
Reserve design is a process that must address many ecological, social, and political factors to successfully identify parcels of land in need of protection to sustain wildlife populations and other natural resources. Making land acquisition choices for a large, terrestrial protected area is difficult because it occurs over a long timeframe and may involve consideration future conditions...
Authors
Stephanie S. Romanach, Fred A. Johnson, Bradley Stith, Mathieu Bonneau
Effects of drought and fire on bird communities of the Kofa National Wildlife Refuge, Arizona Effects of drought and fire on bird communities of the Kofa National Wildlife Refuge, Arizona
Executive Summary The U.S. Government created the Kofa National Wildlife Refuge (Kofa NWR) in 1939 in response to a citizen campaign to improve desert bighorn sheep populations in Arizona. The Kofa NWR is mountainous and remote, and its management by the U.S. Fish and Wildlife Service (FWS) keeps anthropogenic disturbance levels low. As such, Partners In Flight (PIF) listed the Kofa NWR...
Authors
Chris McCreedy, Charles van Riper, Todd C. Esque, Abigail J. Darrah