Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2354
Sea-level history of past interglacial periods: New evidence from uranium-series dating of corals from Curaçao, Leeward Antilles islands
Curaçao has reef terraces with the potential to provide sea-level histories of interglacial periods. Ages of the Hato (upper) unit of the “Lower Terrace” indicate that this reef dates to the last interglacial period, Marine Isotope Stage (MIS) 5.5. On Curaçao, this high sea stand lasted at least 8000 yr (~ 126 to ~ 118 ka). Elevations and age of this reef show that late Quaternary uplift rates on
Authors
Daniel R. Muhs, John M. Pandolfi, Kathleen R. Simmons, R. Randall Schumann
Hybrid analysis of multiaxis electromagnetic data for discrimination of munitions and explosives of concern
The remediation of land containing munitions and explosives of concern, otherwise known as unexploded ordnance, is an ongoing problem facing the U.S. Department of Defense and similar agencies worldwide that have used or are transferring training ranges or munitions disposal areas to civilian control. The expense associated with cleanup of land previously used for military training and war provide
Authors
M.J. Friedel, T.H. Asch, C. Oden
Evidence of recent climate change within the historic range of Rio Grande cutthroat trout: implications for management and future persistence
Evidence of anthropogenically influenced climate change has motivated natural resource managers to incorporate adaptive measures to minimize risks to sensitive and threatened species. Detecting trends in climate variables (i.e., air temperature and hydrology) can serve as a valuable management tool for protecting vulnerable species by increasing our understanding of localized conditions and trends
Authors
Matthew P. Zeigler, Andrew S. Todd, Colleen A. Caldwell
Preliminary surficial geologic map of the Newberry Springs 30' x 60' quadrangle, California
The Newberry Springs 30' x 60' quadrangle is located in the central Mojave Desert of southern California. It is split approximately into northern and southern halves by I-40, with the city of Barstow at its western edge and the town of Ludlow near its eastern edge. The map area spans lat 34°30 to 35° N. to long -116 °to -117° W. and covers over 1,000 km2. We integrate the results of surficial geol
Authors
G. A. Phelps, D. R. Bedford, D. J. Lidke, D. M. Miller, K. M. Schmidt
Pre- and post-remediation characterization of acid-generating fluvial tailings material
The upper Arkansas River south of Leadville, Colorado, USA, contains deposits of fluvial tailings from historical mining operations in the Leadville area. These deposits are potential non-point sources of acid and metal contamination to surface- and groundwater systems. We are investigating a site that recently underwent in situ remediation treatment with lime, fertilizer, and compost. Pre- and po
Authors
Kathleen S. Smith, Katherine Walton-Day, Karin O. Hoal, Rhonda L. Driscoll, K. Pietersen
Imaging with cross-hole seismoelectric tomography
We propose a cross-hole imaging approach based on seismoelectric conversions (SC) associated with the transmission of seismic waves from seismic sources located in a borehole to receivers (electrodes) located in a second borehole. The seismoelectric (seismic-to-electric) problem is solved using Biot theory coupled with a generalized Ohm's law with an electrokinetic streaming current contribution.
Authors
A.H. Araji, A. Revil, A. Jardani, Burke J. Minsley, M. Karaoulis
Paleontology and geochronology of the Long Beach core sites and monitoring wells, Long Beach, California
The U.S. Geological Survey's Focus on Quaternary Stratigraphy in Los Angeles (FOQUS-LA) project was a cooperative coring program between Federal, State, and local agencies. It was designed to provide a better understanding of earthquake potentials and to develop a stratigraphic model of the western Los Angeles Basin in California. The biostratigraphic, geochronologic, and paleoecologic analyses of
Authors
Kristin McDougall, John Hillhouse, Charles Powell, Shannon Mahan, Elmira Wan, Andrei M. Sarna-Wojcicki
234U/238U isotope data from groundwater and solid-phase leachate samples near Tuba City Open Dump, Tuba City, Arizona
This report releases 234U/238U isotope data, expressed as activity ratios, and uranium concentration data from analyses completed at Northern Arizona University for groundwater and solid-phase leachate samples that were collected in and around Tuba City Open Dump, Tuba City, Arizona, in 2008.
Authors
Raymond H. Johnson, Robert Horton, James K. Otton, Michael K. Ketterer
Genesis of the Touissit-Bou Beker Mississippi Valley-type district (Morocco-Algeria) and its relation to the Africa-Europe collision
The Mississippi Valley-type deposits of the Touissit-Bou Beker district are hosted by a 25 m thick sequence of diagenetically and hydrothermally dolomitized carbonate platform rocks of Aalenian-Bajocian age. The sulfide mineralization consists principally of galena and sphalerite and occurs as open-space fillings of voids and moderate to massive replacement of the medium- to coarse-grained host do
Authors
Mohammed Bouabdellah, Donald F. Sangster, David L. Leach, Alex C. Brown, Craig A. Johnson, Poul Emsbo
A 28,000 year history of vegetation and climate from Lower Red Rock Lake, Centennial Valley, Southwestern Montana, USA
A sediment core extending to 28,000 cal yr BP from Lower Red Rock Lake in the Centennial Valley of southwestern Montana provides new information on the nature of full-glacial vegetation as well as a history of late-glacial and Holocene vegetation and climate in a poorly studied region. Prior to 17,000 cal yr BP, the eastern Centennial Valley was occupied by a large lake (Pleistocene Lake Centennia
Authors
Stephanie Ann Mumma, Cathy Whitlock, Kenneth Pierce
Incorporating climate change into systematic conservation planning
The principles of systematic conservation planning are now widely used by governments and non-government organizations alike to develop biodiversity conservation plans for countries, states, regions, and ecoregions. Many of the species and ecosystems these plans were designed to conserve are now being affected by climate change, and there is a critical need to incorporate new and complementary app
Authors
Craig R. Groves, Edward T. Game, Mark G. Anderson, Molly Cross, Carolyn Enquist, Zach Ferdana, Evan Girvetz, Anne Gondor, Kimberly R. Hall, Jonathan Higgins, Rob Marshall, Ken Popper, Steve Schill, Sarah L. Shafer
Magnetic map of the Irish Hills and surrounding areas, San Luis Obispo County, central California
A magnetic map of the Irish Hills and surrounding areas was created as part of a cooperative research and development agreement with the Pacific Gas and Electric Company and is intended to promote further understanding of the areal geology and structure by serving as a basis for geophysical interpretations and by supporting geological mapping, mineral and water resource investigations, and other t
Authors
V. E. Langenheim, J. T. Watt, K.M. Denton