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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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Spatial units to support Lake Erie Cisco Coregonus artedi restoration Spatial units to support Lake Erie Cisco Coregonus artedi restoration
At the request of the Lake Erie Committee, spatial units for Lake Erie Cisco were delineated during spring 2024. Spatial units correspond to the reproductive habitat of extirpated (unoccupied spatial units) and extant (occupied spatial units) populations. Spatial units were delineated using a Council of Lake Committees-endorsed method that involves synthesizing data for evaluation by a...
Authors
Joshua P. Egan, Amanda Susanne Ackiss, Andrew M. Muir
Assessment of undiscovered conventional oil and gas resources of South America and the Caribbean, 2025 Assessment of undiscovered conventional oil and gas resources of South America and the Caribbean, 2025
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean conventional resources of 37.6 billion barrels of oil and 281.6 trillion cubic feet of gas in 31 geologic provinces of South America and the Caribbean.
Authors
Christopher J. Schenk, Tracey J. Mercier, Phuong A. Le, Andrea D. Cicero, Sarah E. Gelman, Jane S. Hearon, Benjamin G. Johnson, Jenny H. Lagesse, Heidi M. Leathers-Miller
Evaluation of turbidity corrections for EXO fluorescent dissolved organic matter (fDOM) sensors Evaluation of turbidity corrections for EXO fluorescent dissolved organic matter (fDOM) sensors
Executive Summary The use of field-deployable fluorescence sensors to better understand dissolved organic matter concentrations and composition has grown immensely in recent years. Applications of these sensors to critical monitoring efforts have also grown, encompassing post-fire monitoring, wastewater tracking, and use as a proxy for various contaminants. Despite the growth, it is well...
Authors
Jacob Fleck, Tim James Baxter, Angela Hansen
Working group on American Eel (WGAMEEL; outputs from 2024 meeting) Working group on American Eel (WGAMEEL; outputs from 2024 meeting)
The Working Group on American Eel (WGAMEEL) met virtually three times in 2022-2024 to address the five Terms of Reference (ToRs) of its three-year term. The first two ToRs tasked WGAMEEL with listing and evaluating data on American eel landings, abundance indices, and spatial and habitat data and also to describe assessment methods used in Canada and the US. Canada-wide American eel...
Authors
Julien April, Kristen A. Anstead, Philippe Brodeur, David K. Cairns, Martin Castonguay, Matthew Cieri, Brian Jessop, Amelie D'Astous, Shelly Denny, Jean-Francois Dumont, Sheila Eyler, Marten A. Koops, Laura Lee, Louis Landry-Massicote, Robby Maxwell, Thomas Pratt, Scott M. Reid, Scott Roloson, Scott L. Schlueter, Shawn Snyder, John A. Young
Critical minerals in zinc ore—An update on Earth Mapping Resources Initiative Research in the Boulder Batholith region, Montana Critical minerals in zinc ore—An update on Earth Mapping Resources Initiative Research in the Boulder Batholith region, Montana
Plain Language Summary U.S. Geological Survey research is providing key critical mineral information that may have potential for critical mineral production of several mining districts in the Boulder Batholith region, to better understand the abundance and distribution of natural resources within this region. Continued research can be used to show the potential for previously...
Authors
Sean Patrick Gaynor, Eric D. Anderson, Kyle A. Eastman, Karen Lund, Chris Gammons, Heather A. Lowers, Jay M. Thompson
Landsat 8–9 geometric and radiometric calibration and characterization Landsat 8–9 geometric and radiometric calibration and characterization
The U.S. Geological Survey Earth Resources Observation and Science Cal/Val (Calibration and Validation) Center of Excellence is a global leader in improving the accuracy, precision, and quality of remote-sensing data. Calibration is the process of quantitatively defining a system’s response to known and controlled signal inputs. Validation is the process of assessing, by independent...
Authors
Cody Anderson, Michael J. Choate, Esad Micijevic, Jerad L. Shaw