Geology of the Mount Rogers area, revisited: Evidence of Neoproterozoic continental rifting, glaciation, and the opening and closing of the Iapetus Ocean, Blue Ridge, VA–NC–TN
Arthur J. Merschat, Ryan J. McAleer, Christopher S. Holm-Denoma, C. Scott Southworth
2023, Conference Paper
Recent field and geochronological studies in eight 7.5-minute quadrangles near Mount Rogers in Virginia, North Carolina and Tennessee recognize (1) important stratigraphic and structural relationships for the Neoproterozoic Mount Rogers and Konnarock Formations, and the northeast end of the Mountain City window; (2) the separation of Mesoproterozoic rocks of the...
Resistivity imaging over porphyry copper systems in the Red Mountain district, southwest Colorado, USA
Eric D. Anderson, Maryla Deszcz-Pan, Douglas Yager, Kyle Eastman, Bennett Eugene Hoogenboom
2023, Conference Paper, Proceedings of the 17th SGA biennial meeting
The Red Mountain district in southwestern Colorado produced base and precious metals hosted in breccia pipes and vein structures related to an extensive lithocap that overlies pervasive quartz-sericite-pyrite alteration. A helicopter-borne time-domain electromagnetic survey flown over the district yielded resistivity values that range from tens to thousand or more ohm-m,...
Reconnaissance mineral and cathodoluminescence studies of gold occurrences in the Pogo-Black Mountain area, eastern interior Alaska, USA
Garth E. Graham, Erin E. Marsh, Heather A. Lowers, Ryan D. Taylor
2023, Conference Paper, Proceedings of the 17th SGA biennial meeting
The Pogo Au deposit is the largest of a number of gold occurrences in eastern interior Alaska, that occur along a broad trend from west of Pogo to Black Mountain. Some of these occurrences are hosted in amphibolite facies gneisses and others in mid-Cretaceous igneous rocks that intruded the older...
Stratigraphic cross sections of the Lewis Shale in the eastern part of the southwestern Wyoming Province, Wyoming and Colorado
Jane S. Hearon
2023, Scientific Investigations Map 3511
Three stratigraphic cross sections A–A', B–B', and C–C' were created for the Lewis Shale and associated strata in the eastern part of the Southwestern Wyoming Province of Wyoming and Colorado. The cross sections highlight 15 clinothems within the Lewis Shale, Fox Hills Sandstone, and Lance Formation progradational system (also referred...
Broad-scale assessment of methylmercury in adult amphibians
Brian J. Tornabene, Blake R. Hossack, Brian J. Halstead, Collin A. Eagles-Smith, Michael J. Adams, Adam R. Backlin, Adrianne Brand, Colleen Emery, Robert N. Fisher, Jillian Elizabeth Fleming, Brad Glorioso, Daniel A. Grear, Evan H. Campbell Grant, Patrick M. Kleeman, David Miller, Erin L. Muths, Christopher Pearl, Jennifer Rowe, Caitlin Teresa Rumrill, J. Hardin Waddle, Megan Winzeler, Kelly L. Smalling
2023, Environmental Science and Technology (57) 17511-17521
Mercury (Hg) is a toxic contaminant that has been mobilized and distributed worldwide and is a threat to many wildlife species. Amphibians are facing unprecedented global declines due to many threats including contaminants. While the biphasic life history of many amphibians creates a potential nexus for methylmercury (MeHg) exposure in...
System-scale airborne electromagnetic surveys in the lower Mississippi River Valley support multidisciplinary applications
Burke J. Minsley, Ryan F. Adams, William H. Asquith, Bethany L. Burton, Bennett Eugene Hoogenboom, Stephanie R. James, Courtney D. Killian, Katherine J. Knierim, Wade H. Kress, Maxwell A. Lindaman, Andrew T. Leaf, James R. Rigby, Jonathan P. Traylor
2023, Conference Paper
The lower Mississippi River Valley spans over 200,000 square kilometres in parts of seven states, encompassing areas of critical groundwater supplies, natural hazards, infrastructure, and low-lying coastal regions. From 2018 - 2022, the U.S. Geological Survey acquired over 82,000 line-kilometres of airborne electromagnetic, radiometric, and magnetic data over this region...
Dating the penultimate great earthquake in south-central Alaska using tree-ring crossdating and radiocarbon wiggle-matching
David J Barclay, Peter J. Haeussler, Robert C. Witter
2023, Quaternary Science Advances (13)
A forest bed of tree stumps currently in the intertidal zone at Girdwood, south-central Alaska, records coseismic submergence during the penultimate great earthquake. Tree-ring samples from ten spruce stumps were crossdated to develop a 149-year-long ring-width chronology. Radiocarbon wiggle-matching found that single-ring ages from the chronology were offset 28 ± 7 years older...
Monitoring population-level foraging distribution of a marine migratory species from land: Strengths and weaknesses of the isotopic approach on the Northwest Atlantic loggerhead turtle aggregation
Simona A. Ceriani, Susan Murasko, David S. Addison, David Anderson, Greg Curry, Nicole A. Desjardin, Scott F. Eastman, Daniel R. Evans, Nancy Evou, Mariana M.P.B. Fuentes, Matthew H. Godfrey, Kristen Hart, Paul Hillbrand, Sarah E. Hirsch, Cody R. Mott, Katherine L. Mansfield, Kristen T. Mazzarella, Sarah V. Norris, S. Michelle Pate, Katrina F. Phillips, Kirt W. Rusenko, Brian M. Shamblin, Amber Stevenson, Kelly A. Sloan, Anton D. Tucker, Ryan C. Welsh, Paolo Casale
2023, Frontiers in Marine Science (10)
Assessing the linkage between breeding and non-breeding areas has important implications for understanding the fundamental biology of and conserving animal species. This is a challenging task for marine species, and in sea turtles a combination of stable isotope analysis (SIA) and satellite telemetry has been increasingly used. The Northwest...
Multiple-well monitoring site adjacent to the Elk Hills Oil Field, Kern County, California
Rhett R. Everett, Janice M. Gillespie, Mackenzie M. Shepherd, Andrew Y. Morita, Maryanne Bobbitt, Christopher A. Kohel, John G. Warden
2023, Open-File Report 2023-1073
IntroductionThe Elk Hills Oil Field is one of the many fields selected for regional groundwater mapping and monitoring by the California State Water Resources Control Board as part of the Oil and Gas Regional Monitoring Program (California State Water Resources Control Board, 2015, 2022b; U.S. Geological Survey, 2022a). The U.S....
Using high-frequency monitoring data to quantify city-wide suspended-sediment load and evaluate TMDL goals
Samuel Adam Miller, James S. Webber, John D. Jastram, Marcus F Aguilar
2023, Environmental Monitoring and Assessment (195)
Excess sediment is a common reason water bodies in the USA become listed as impaired resulting in total maximum daily loads (TMDL) that require municipalities to invest millions of dollars annually on management practices aimed at reducing suspended-sediment loads (SSLs), yet monitoring data are rarely used...
A watershed moment for western U.S. dams
Amy E. East, Gordon E. Grant
2023, Water Resources Research (59)
The summer of 2023 is a notable time for water-resource management in the western United States: Glen Canyon Dam, on the Colorado River, turns 60 years old while the largest dam-removal project in history is beginning on the Klamath River. This commentary discusses these events in the context...
Arsenic, chromium, uranium, and vanadium in rock, alluvium, and groundwater, Mojave River and Morongo Areas, western Mojave Desert, southern California
John A. Izbicki, Krishangi D. Groover, Whitney A. Seymour
2023, Scientific Investigations Report 2023-5089
Trace elements within groundwater that originate from aquifer materials and pose potential public-health hazards if consumed are known as geogenic contaminants. The geogenic contaminants arsenic, chromium, and vanadium can form negatively charged ions with oxygen known as oxyanions. Uranium complexes with bicarbonate and carbonate to form negatively charged ions having...
Preliminary map of the surface rupture from the August 9, 2020, Mw 5.1 earthquake near Sparta, North Carolina—The Little River fault and other possible coseismic features
Arthur J. Merschat, Mark W. Carter
2023, Open-File Report 2023-1074
This publication is a preliminary map and geodatabase of the coseismic surface rupture and other coseismic features generated from the August 9, 2020, Mw 5.1 earthquake near Sparta, North Carolina. Geologic mapping facilitated by analysis of post-earthquake quality level 0 to 1 lidar, document the coseismic surface rupture, named the...
The enigmatic Rattlesnake Knoll, Spring Valley, east-central Nevada—A geophysical perspective
Edward A. Mankinen, Peter D. Rowley, Edwin H. McKee
2023, Open-File Report 2023-1002
Rattlesnake Knoll is a small, 30-meter-high mound of igneous breccia in the center of Spring Valley, east-central Nevada. In the past, researchers have disagreed as to whether the unusual-looking outcrop is intrusive or volcanic. The breccia possesses a normal magnetic polarity, but this is not apparent in aeromagnetic survey data....
The 3D Elevation Program—Supporting Idaho’s economy
Tom Carlson
2023, Fact Sheet 2023-3035
IntroductionDue to Idaho’s inland location approximately 350 miles from the Pacific Ocean and its 80 recognized mountain ranges, the State’s climate varies widely, with maritime influence in the northern and western parts of Idaho and continental influence on the eastern side. The weather in the abundant mountains is unpredictable and...
Influences of landscape composition on hunter-harvested mallard body mass and condition in eastern Arkansas
John T. Veon, David G. Krementz, Luke W. Naylor, Brett Alexander DeGregorio
2023, The Journal of Wildlife Management (88)
Waterfowl with more body mass and a greater body condition during the non-breeding season are thought to be more likely to survive and have increased productivity during the following breeding season. Body mass and body condition in waterfowl should reflect the resources available to them locally. We analyzed the relationship...
Striped bass exploitation in tailwater habitats of east-central Oklahoma
Alex Vaisvil, Daniel Shoup, Shannon K. Brewer
2023, Cooperator Science Series FWS/CSS-152-2023
Striped Bass (Morone saxatilis) is naturally anadromous, but a few land-locked populations have been documented that are self-sustaining, including fish in the Arkansas River, Oklahoma. This rare population is the source of brood stock for the Oklahoma Department of Wildlife Conservation hatcheries and is an important sportfish stock. Striped Bass...
Spatially and temporally variable production pathways support the Lake Erie central basin food web
Joshua M. Tellier, Tomas O. Höök, Richard Kraus, Paris D. Collingsworth
2023, Journal of Great Lakes Research (49) 1137-1149
In large freshwater systems, the dominant production pathways supporting food webs are often spatiotemporally variable. We used stable isotope analysis and analysis of covariance (ANCOVA) models to investigate spatial and interannual variation in the dominant production pathways supporting fish consumers within the central basin of Lake Erie. We examined C and N stable isotope ratios...
Intra-lake trends and inter-lake comparisons of Mysis diluviana life history variables and their relationships to food limitation
Toby J. Holda, J.M. Watkins, Anne E. Scofield, Stephen Pothoven, David Warner, Timothy P. O’Brien, Kelly L. Bowen, Warren J.S. Currie, David J. Jude, Patrick Boynton, Lars G. Rudstam
2023, Journal of Great Lakes Research (49) 1179-1189
The opossum shrimp, Mysis diluviana, is an important member of the offshore food webs of the Laurentian Great Lakes, but its response to ecosystem changes that have occurred over the past several decades is not well understood. We combined the data of four long-term sampling programs, adding several years of data...
Petrology and geochronology of Cretaceous–Eocene plutonic rocks in northeastern Washington, USA: Crustal thickening, slab rollback, and origin of the Challis episode
Jeffery H. Tepper, Matthew W. Loewen, Liam M. Caulfield, Peter C. Davidson, Kaitlin L. Ruthenberg, Samuel WF Blakely, Duncan FJF Knudsen, Devin Black, Bruce K Nelson, Yemane Asmerom
2023, GSA Bulletin (136) 725-740
Cretaceous through Eocene plutonic rocks in northeastern Washington, USA, document a 60 m.y. history of crustal thickening and subsequent collapse and extension in response to two terrane-accretion events. Rocks emplaced 113–53 Ma have increasing La/Yb ratios reflecting orogenic plateau development after arrival of...
Groundwater-flow model of the Treasure Valley, southwestern Idaho, 1986–2015
Stephen A. Hundt, James R. Bartolino
2023, Scientific Investigations Report 2023-5096
Most of the population of the Treasure Valley and the surrounding area of southwestern Idaho and easternmost Oregon depends on groundwater for domestic supply, either from domestic or municipal-supply wells. Current and projected rapid population growth in the area has caused concern about the long-term sustainability of the groundwater resource....
Potentiometric surfaces (2013, 2015), groundwater quality (2010–15), and water-level changes (2011–13, 2013–15) in the Sparta-Memphis aquifer in Arkansas
Anna M. Nottmeier, Katherine J. Knierim, Phillip D. Hays
2023, Scientific Investigations Report 2023-5103
The Sparta-Memphis aquifer, present across much of eastern Arkansas, is the second most used groundwater resource in the State, with the Mississippi River Valley alluvial aquifer being the primary groundwater resource. The U.S. Geological Survey, in cooperation with Arkansas Department of Agriculture-Natural Resources Division, Arkansas Geological Survey, Natural Resources Conservation...
Thirteen years of turtle capture–mark–recapture in a small urban pond complex in Louisiana, USA
Brad M. Glorioso, J. Hardin Waddle, Doug P. Armstrong
2023, Journal of Herpetology (57) 290-296
Turtles are one of the most imperiled vertebrate groups in the world. With habitat destruction unabated in many places, urban and suburban greenspaces may serve as refugia for turtles, at least those species able to tolerate heavily altered landscapes. In south-central Louisiana, we have conducted...
Long-term water-quality constituent trends in the Little Arkansas River, south-central Kansas, 1995–2021
Mandy L. Stone, Brian J. Klager
2023, Scientific Investigations Report 2023-5102
The Equus Beds aquifer and Cheney Reservoir are primary sources for the city of Wichita’s current (2023) water supply. The Equus Beds aquifer storage and recovery (ASR) project was developed by the city of Wichita in the early 1990s to meet future water demands using the Little Arkansas River as...
Crustal thickness and the VP/VS ratio within the Arabia Plate from P-wave receiver functions at 154 broadband seismic stations
Alexander R. Blanchette, Simon L. Klemperer, Walter D. Mooney
2023, Open-File Report 2023-1042
As part of a joint Saudi Geological Survey (SGS) and United States Geological Survey project, we analyzed P-wave receiver functions from seismic stations covering most of the Kingdom of Saudi Arabia to map the thickness of the crust across the Arabia Plate. We present an update of crustal thickness...
