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Top Elevation of Glacial Till and Thickness of the Big Sioux Aquifer Delineated From Electrical Resistivity Tomography Surveys Near Sioux Falls, South Dakota, 2022 and 2025 Top Elevation of Glacial Till and Thickness of the Big Sioux Aquifer Delineated From Electrical Resistivity Tomography Surveys Near Sioux Falls, South Dakota, 2022 and 2025
The City of Sioux Falls, South Dakota, requested the U.S. Geological Survey perform electrical resistivity surveys on three parcels of land north of the city. Electrical resistivity data were collected along a total of 22 transects during March 14–18, 2022, and November 17–21, 2025. Results from electrical resistivity surveys were used to delineate the top of glacial till deposits for...
Authors
Colton J. Medler, Todd M. Anderson
Calcareous nannofossil assemblage changes in the Surprise Hill core and their implications for floral response to the Paleocene-Eocene Thermal Maximum across the Salisbury Embayment of Virginia, USA Calcareous nannofossil assemblage changes in the Surprise Hill core and their implications for floral response to the Paleocene-Eocene Thermal Maximum across the Salisbury Embayment of Virginia, USA
We present Paleocene-Eocene calcareous nannofossil biostratigraphy and paleoecology for the Surprise Hill core, U.S. Atlantic Coastal Plain, Virginia. Calcareous nannofossil datums ranging from Zone NP3 to NP14 were identified. The Danian-aged Brightseat Formation rests unconformably atop the Lower Cretaceous Potomac Group at 211.4 m and disconformably underlies the Aquia Formation at...
Authors
Masayuki Utsunomiya, Jean Self-Trail, D. Clay Kelly, Xiaodong Zhang, Kristina Frank Gardner, James C. Zachos
Watershed Continuum Monitoring Approach: Combining multiple water quality patterns along stream and river flowpaths to track sources, pathways, and processing of pollutants Watershed Continuum Monitoring Approach: Combining multiple water quality patterns along stream and river flowpaths to track sources, pathways, and processing of pollutants
There is a growing need to improve and expand water quality monitoring approaches to more accurately track the sources, fate, and transport of multiple chemicals and pollutants holistically and quantify the effects of best management practices (BMPs) at the watershed scale. An overarching question raised by scientists, environmental managers, and the general public is: how far can water...
Authors
Sujay Kaushal, Ashley Mon, Stanley Grant, Paul M. Mayer, Aaron J. Porter, Andrew J. Sekellick, Jason Hamilton Chase, Shantanu Bhide, John D. Jastram, Tammy Newcomer-Johnson, Sydney A. Shelton, Alexis M. Yaculak, Joseph T. Malin, Carly Marcella Maas, Nicholas Salanitri, Daniel J. Silberstein, Steven P. Hohman, Ashley B. Dann, Weston M Slaughter, Megan A. Rippy, Ahmed Monofy, Ruth R. Shatkay, Jenna E. Reimer, Madeleine Seppi, Randi Noel, Julianna Mussa, Bennett Kellmayer, Gwendolyn Sivirichi, Melissa Grese, Walter L.M. Boger, Jeffrey G. Chanat, Shuiwang Duan, Kenneth T. Belt
Effects of wildfire on soil hydraulic properties in the western Oregon Cascades Effects of wildfire on soil hydraulic properties in the western Oregon Cascades
Wildfires can substantially impact the hydrology of forested watersheds, increasing the risk of hydrologic hazards such as flash floods and debris flows. Soil hydraulic properties related to infiltration are a key control in determining the timing and magnitude of these hydrogeomorphic events. In our study, we collected 445 soil cores from burned (216 cores) and unburned (229 cores)...
Authors
Cedric Pimont, Evan A. Thaler, Brian A. Ebel, Kevin D. Bladon
Hydrogeologic framework and conceptual groundwater-flow model of the panhandle and northwest parts of the High Plains (Ogallala) aquifer in Oklahoma, 1998–2022 Hydrogeologic framework and conceptual groundwater-flow model of the panhandle and northwest parts of the High Plains (Ogallala) aquifer in Oklahoma, 1998–2022
This study was conducted by the U.S. Geological Survey, in cooperation with the Oklahoma Water Resources Board, to update the hydrogeologic framework and conceptual flow model for the panhandle and northwest parts of the High Plains (Ogallala) aquifer in Oklahoma, which together compose the Ogallala aquifer focus area. The study included the construction of a potentiometric surface, and...
Authors
Amy S. Morris, Colin A. Baciocco, Isaac A. Dale, Chloe Codner, Ethan A. Kirby, Grant M. Graves, Derrick L. Wagner, Eric G. Fiorentino, Alan LePera, Jon E. Sanford, Lara Joy
Hazard potential of compound flooding from rainfall, storm surge, and groundwater in coastal New York and Connecticut Hazard potential of compound flooding from rainfall, storm surge, and groundwater in coastal New York and Connecticut
Compound flood events, the co-occurrence of multiple flood drivers, can result in flood hazard potential exceeding that of any single driver alone. To evaluate compound flooding in a semi-urbanized coastal area, historical records dating back to 1970 are used to study the co-occurrences of high precipitation, storm surge, and shallow groundwater conditions along the coastlines of New...
Authors
Robin L. Glas, Liv M. Herdman, Salme Ellen Cook, Archi Howlader, Kristina Kirkyla Masterson
Quantitative mineral resource assessment of lithium pegmatite deposits in the southern Appalachian orogen Quantitative mineral resource assessment of lithium pegmatite deposits in the southern Appalachian orogen
The first quantitative mineral resource assessment for undiscovered lithium pegmatite deposits in the southern Appalachian region of the United States was conducted. Permissive tracts for lithium pegmatite deposits were delineated by integrating lithological, tectonic, geochemical, geophysical and mineral occurrence data. Lithium pegmatite prospectivity of the tracts was ranked with...
Authors
Joshua Mark Rosera, Kelsey Elizabeth Crocker, Laura Pianowski, Jacob T. Murchek, Ashton M. Wiens, Margaret M. Sanders, Lucas Leonidus Evart, Jacob DeAngelo, Graham W. Lederer, Joshua A. Coyan
Not so fatal attraction: Captive female Burmese Python lures do not improve wild python detection Not so fatal attraction: Captive female Burmese Python lures do not improve wild python detection
The ongoing invasion of Python bivittatus (Burmese Python; henceforth, Python) across the Greater Everglades Ecosystem (GEE) has led to near total collapse of the affected mammal community over the past few decades. Management efforts to eliminate Pythons and control their spread have been hampered by the Python's low detectability, which may be improved by using a lure. In controlled...
Authors
Alex D. Potash, Maggie Jones, Michael Kirkland, Jenna Cole, Kristen Hart, Robert A. McCleery
Accounting for emigration reveals high survival and bimodal size at departure from a loggerhead sea turtle (Caretta caretta) foraging area Accounting for emigration reveals high survival and bimodal size at departure from a loggerhead sea turtle (Caretta caretta) foraging area
The life history of hard-shelled sea turtles includes several ontogenetic shifts in habitat use and these complex permanent emigration patterns can impact estimates of stage-specific population rates, including survival. We developed several multistate mark recapture models to estimate survival of adult and juvenile loggerhead turtles from a coastal bay in the northern Gulf of America...
Authors
Caroline M. Blommel, Margaret Lamont, William L. Kendall
Tropicalization of the temperate zone: Spatiotemporal variability of winter warming and declining freeze days across the United States Tropicalization of the temperate zone: Spatiotemporal variability of winter warming and declining freeze days across the United States
We investigate changes in cool-season and winter daily minimum (Tmin) and maximum (Tmax) temperatures, and the occurrence of freeze days, from 1952 to 2024 across the conterminous United States (CONUS). Emphasis is placed on the tropical-temperate transition zone (TTTz) in the southeastern CONUS. During winter, ~70% of the land area exhibited Tmin warming rates exceeding those of Tmax...
Authors
Vincent M. Brown, Derek T. Thompson, Buren B. DeFee, Michael Osland, Barry D. Keim
Variability and consistency in wildfire susceptibility: Insights from a national compilation Variability and consistency in wildfire susceptibility: Insights from a national compilation
Background Wildfire risk in the United States is rising and remains a land management priority. The quantitative wildfire risk assessment (QWRA) framework integrates fuels, topography, weather and values at risk to estimate the potential change in value from wildfire. Within this, response functions (RFs) represent how values respond to fire intensity. These are often based on expert...
Authors
Aaron Daniel Russell, Lucas Bair, James R. Meldrum, Todd Hawbaker
Patterns of floodplain forest mortality and recruitment along the Upper Mississippi and Illinois Rivers: Associations with forest fragmentation and flood inundation Patterns of floodplain forest mortality and recruitment along the Upper Mississippi and Illinois Rivers: Associations with forest fragmentation and flood inundation
Context Different rates of floodplain forest recruitment and mortality can reveal important changes in ecosystem processes that drive forest dynamics, resulting in net changes in forest cover, thereby influencing a wide range of river habitat and morphological characteristics.Objectives We evaluated characteristics of forest change areas in the Upper Mississippi River System.Methods An...
Authors
Nathan R. De Jager, Jason J. Rohweder, Molly Van Appledorn, Shelby A. Weiss, Matthew Trumper, Lyle J. Guyon