James B. Paces
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View article: Two million years of climate-driven cave-sediment aggradation and valley incision in the southern Ozark Plateau from Fitton Cave, northern Arkansas, USA
Two million years of climate-driven cave-sediment aggradation and valley incision in the southern Ozark Plateau from Fitton Cave, northern Arkansas, USA Open
Landscape evolution in karst terrains affects both subterranean and surface settings. For better understanding of controlling processes and connections between the two, multiple geochronometers were used to date sediments and speleothems i…
View article: Radiogenic Strontium‐ and Uranium‐Isotope Tracers of Water‐Rock Interactions and Hydrothermal Flow in the Upper Geyser Basin, Yellowstone Plateau Volcanic Field, USA
Radiogenic Strontium‐ and Uranium‐Isotope Tracers of Water‐Rock Interactions and Hydrothermal Flow in the Upper Geyser Basin, Yellowstone Plateau Volcanic Field, USA Open
Natural radiogenic isotopes (primarily 87 Sr/ 86 Sr) from hot springs in the Upper Geyser Basin of the Yellowstone Plateau volcanic field and associated rocks were used to evaluate groundwater flow patterns, water‐rock reactions, and the e…
View article: Clumped Isotopes Record a Glacial‐Interglacial Shift in Seasonality of Soil Carbonate Accumulation in the San Luis Valley, Southern Rocky Mountains, USA
Clumped Isotopes Record a Glacial‐Interglacial Shift in Seasonality of Soil Carbonate Accumulation in the San Luis Valley, Southern Rocky Mountains, USA Open
Clumped isotope paleothermometry using pedogenic carbonates is a powerful tool for investigating past climate changes. However, location‐specific seasonal patterns of precipitation and soil moisture cause systematic biases in the temperatu…
View article: Geologic map and hydrogeologic investigations of the upper Santa Cruz River basin, southern Arizona
Geologic map and hydrogeologic investigations of the upper Santa Cruz River basin, southern Arizona Open
First posted February 10, 2023 For additional information, contact: Director, Geosciences and Environmental Change Science CenterU.S. Geological SurveyBox 25046, MS-980Denver, CO 80225-0046 This report includes an updated geologic map and …
View article: Strontium isotope chronostratigraphic age of a sirenian fossil site on Santa Rosa Island, Channel Islands National Park, California
Strontium isotope chronostratigraphic age of a sirenian fossil site on Santa Rosa Island, Channel Islands National Park, California Open
First posted April 12, 2023 For additional information, contact: Center Director, Geosciences and Environmental Change Science CenterU.S. Geological SurveyBox 25046, Mail Stop 980Denver, CO 80225Contact Pubs Warehouse Fossils in the order …
View article: Evaluation of hydrologic processes in the eastern Snake River Plain aquifer using uranium and strontium isotopes, Idaho National Laboratory, eastern Idaho
Evaluation of hydrologic processes in the eastern Snake River Plain aquifer using uranium and strontium isotopes, Idaho National Laboratory, eastern Idaho Open
First posted April 14, 2023 For additional information, contact: Director, Idaho Water Science CenterU.S. Geological Survey230 Collins RoadBoise, Idaho 83702-4520 Waste constituents discharged to the eastern Snake River Plain aquifer at th…
View article: The Coles Hill Uranium Deposit, Virginia, USA: Geology, Geochemistry, Geochronology, and Genetic Model
The Coles Hill Uranium Deposit, Virginia, USA: Geology, Geochemistry, Geochronology, and Genetic Model Open
The Coles Hill uranium deposit, with an indicated resource of about 130 Mlb of U3O8, is the largest unmined uranium deposit in the United States. The deposit is hosted in the Taconian (approx. 480–450 Ma) Martinsville igneous complex, whic…
View article: Geomorphic history of Lake Manix, Mojave Desert, California: Evolution of a complex terminal lake basin
Geomorphic history of Lake Manix, Mojave Desert, California: Evolution of a complex terminal lake basin Open
Pluvial lake deposits in the Basin and Range province have long been exploited for records of hydrologic and climatic change. To obtain the most accurate reconstructions, a thorough understanding of the geomorphic evolution of such lake ba…
View article: Hydrothermal Activity in the Southwest Yellowstone Plateau Volcanic Field
Hydrothermal Activity in the Southwest Yellowstone Plateau Volcanic Field Open
In the past two decades, the U.S. Geological Survey and the National Park Service have studied hydrothermal activity across the Yellowstone Plateau Volcanic Field (YPVF) to improve the understanding of the magmatic‐hydrothermal system and …
View article: Multivariate Analysis of Hydrochemical Data for Jewel Cave, Wind Cave, and Surrounding Areas
Multivariate Analysis of Hydrochemical Data for Jewel Cave, Wind Cave, and Surrounding Areas Open
\nJewel Cave National Monument and Wind Cave National Park in South Dakota contain two of the six longest caves worldwide. These caves contain subterranean lakes that are important points of intersection between the water table of the Madi…
View article: Strontium and uranium isotopes from lacustrine carbonates as a paleohydrologic tracer in arid wetlands: An example from the Pahranagat Valley, Nevada
Strontium and uranium isotopes from lacustrine carbonates as a paleohydrologic tracer in arid wetlands: An example from the Pahranagat Valley, Nevada Open
The combination of strontium (87Sr/86Sr) and uranium (234U/238U) isotopes is an especially useful tool to track and quantify mixtures of water sources in arid wetlands, where chemistry and lighter isotopic tracers are strongly influenced b…
View article: Geologic map of the Fort Morgan 7.5' quadrangle, Morgan County, Colorado
Geologic map of the Fort Morgan 7.5' quadrangle, Morgan County, Colorado Open
First posted June 8, 2018 For additional information, contact: Director, Geosciences and Environmental Change Science Center U.S. Geological Survey Box 25046, Mail Stop 980 Denver, CO 80225http://gec.cr.usgs.gov/ The Fort Morgan 7.5′ quadr…
View article: Geologic map of the Weldona 7.5' quadrangle, Morgan County, Colorado
Geologic map of the Weldona 7.5' quadrangle, Morgan County, Colorado Open
First posted March 21, 2018 For additional information, contact: Director, Geosciences and Environmental Change Science Center U.S. Geological Survey Box 25046, Mail Stop 980 Denver, CO 80225http://gec.cr.usgs.gov/ The Weldona 7.5′ quadran…