A5036916615- Geology and Paleoclimatology Research
- Aeolian processes and effects
- Archaeology and Natural History
- Geological formations and processes
- Hydrology and Sediment Transport Processes
- Geological and Geochemical Analysis
- Botany, Ecology, and Taxonomy Studies
- Water Quality and Resources Studies
- Geochemistry and Geologic Mapping
- Atmospheric chemistry and aerosols
- Species Distribution and Climate Change
- Isotope Analysis in Ecology
- Atmospheric aerosols and clouds
- Biocrusts and Microbial Ecology
- Landslides and related hazards
- earthquake and tectonic studies
- Geological Studies and Exploration
- Archaeology and ancient environmental studies
- Hydrocarbon exploration and reservoir analysis
- Groundwater and Isotope Geochemistry
- Soil erosion and sediment transport
- Coal and Its By-products
- Geological Modeling and Analysis
- Atmospheric and Environmental Gas Dynamics
- Soil Geostatistics and Mapping
Denver Federal Center
2008-2021
United States Geological Survey
2012-2021
Google (United States)
2018
Denver Public Library
2014
Geosciences and Environmental Change Science Center
2014
Pacific Island Ecosystems Research Center
2009
UCLA Health
2009
United States Department of the Interior
1976-2009
University of Colorado Boulder
1975-2001
University of Miami
1995
On April 15 and 19, 1998, two intense dust storms were generated over the Gobi desert by springtime low‐pressure systems descending from northwest. The windblown was detected its evolution followed yellow color on SeaWiFS satellite images, routine surface‐based monitoring, through serendipitous observations. cloud recirculating, it removed a precipitating weather system east Asia. 19 crossed Pacific Ocean in 5 days, subsided to surface along mountain ranges between British Columbia...
Aeolian dust (windblown silt and clay) is an important component in arid-land ecosystems because it may contribute to soil formation furnish essential nutrients. Few geologic surfaces, however, have been characterized with respect dust-accumulation history resultant nutrient enrichment. We developed a combination of methods identify the presence aeolian arid regions evaluate roles this ecosystem processes. Unconsolidated sandy sediment on isolated surfaces Canyonlands region Colorado Plateau...
Dust samples collected annually for 5 years from 55 sites in southern Nevada and California provide the first regional source of information on modern rates dust deposition, grain size, mineralogical chemical composition relative to climate type lithology source. The average silt clay flux (rate deposition) southeastern ranges 4.3 15.7 g/m 2 /yr, but southwestern is as high 30 /yr. climatic factors that affect interact with each other (playas versus alluvium), lithology, geographic area,...
Abstract The interactions between playa hydrology and playa‐surface sediments are important factors that control the type amount of dust emitted from playas as a result wind erosion. production evaporite minerals during evaporative loss near‐surface ground water results in both creation maintenance several centimeters or more loose sediment on near surfaces wet playas. Observations characterize texture, mineralogic composition hardness – at Franklin Lake, Soda Lake West Cronese Mojave Desert...
Research Article| September 01, 1995 Quaternary soils and dust deposition in southern Nevada California Marith C. Reheis; Reheis 1U.S. Geological Survey, Federal Center, Box 25046, Lakewood, Colorado 80225 Search for other works by this author on: GSW Google Scholar Jonathan Goodmacher; Goodmacher 2Department of Sciences, San Diego State University, Diego, 92182 Jennifer W. Harden; Harden 3U.S. 345 Middlefield Road, Menlo Park, 94025 Leslie D. McFadden; McFadden 4Department University New...
We use new space geodetic data from very long baseline interferometry and satellite laser ranging combined with other geologic to study contemporary deformation in the Basin Range province of western United States. Northwest motion central Sierra Nevada block relative stable North America, a measure integrated deformation, is 12.1±1.2 mm/yr oriented N38°W±5° (one standard error), agreement previous geological estimates within uncertainties. This velocity reflects both east‐west extension...
Salt‐rich dust derived from the Owens Lake playa is deposited in significant quantities to distances of at least 40 km north and south playa. Semiannual measurements 1991 1994 deposition rates (dust flux) composition 2 m above ground seven sites Valley show that (1) mainly playa, although areas closer can also be sources; (2) flux higher winter than summer, but about same or slightly lower winter; (3) on interannual variation large (factors 5–10 during 3 years), downwind sites, much smaller;...
Research Article| March 01, 1997 Late Cenozoic history and slip rates of the Fish Lake Valley, Emigrant Peak, Deep Springs fault zones, Nevada California Marith C. Reheis; Reheis 1U.S. Geological Survey, MS-980, Federal Center, Box 25046, Lakewood, Colorado 80225 Search for other works by this author on: GSW Google Scholar Thomas L. Sawyer 210455 San Fernando Road, Reno, 89605 Author Article Information Publisher: Society America First Online: 01 Jun 2017 Online Issn: 1943-2674 Print...
Abstract Soils formed on alluvial fan deposits that range in age from about 35 000 to 200 yr BP near Silver Lake playa the Mojave Desert permit study of rates soil development an arid, hyperthermic climate. Field‐described properties soils were quantified and analyzed using a index combines horizon thicknesses. We compared variability values five independent descriptions same profile with four described by different people. The due description accounts for between 30 80% total (that both...
[1] Modern dusts across southwestern United States deserts are compositionally similar to dust-rich Av soil horizons (depths of 0–0.5 cm and 1–4 at 35 sites) for common crustal elements but distinctly different some trace elements. Chemical compositions magnetic properties the samples among sites relative dust sources, geographic areas, lithologic substrates. Exceptions Li, U, W, enriched in Owens Valley, California, Mg Sr, soils formed on calcareous fan gravel southeast Nevada. The...
Research Article| January 01, 2008 Geochemical evidence for airborne dust additions to soils in Channel Islands National Park, California Daniel R. Muhs; Muhs 1U.S. Geological Survey, M.S. 980, Box 25046, Federal Center, Denver, Colorado 80225, USA Search other works by this author on: GSW Google Scholar James Budahn; Budahn Donald L. Johnson; Johnson 2Department of Geography, University Illinois, Urbana, Illinois 61801, Marith Reheis; Reheis 3U.S. Jossh Beann; Beann Gary Skipp; Skipp Eric...
Abstract Four soil chronosequences in the southern Great Basin were examined order to study and quantify development during Quaternary. Soils of all four areas are developed gravelly alluvial fans semiarid climates with 8 40 cm mean annual precipitation. Lithologies alluvium granite-gneiss at Silver Lake, granite basalt Cima Volcanic Field, limestone Kyle Canyon, siliceous volcanic rocks Fortymile Wash. Ages soils approximated from several radiometric experimental techniques, rates assessed...
Islands are natural dust traps, and San Clemente Island, California, is a good example. Soils on marine terraces cut into Miocene andesite this island clay‐rich Vertisols or Alfisols with vertic properties. These soils overlain by silt‐rich mantles, 5–20 cm thick, that contrast sharply the underlying subsoils. The silt mantles have mineralogy distinct from bedrock. Silt rich in quartz, which rare andesite. clay fraction of dominated mica, also absent local andesite, contrasts subsoils,...
The Earth's bedrock is overlain in many places by a loosely compacted and mostly unconsolidated blanket of sediments which soils commonly are developed. These generally were eroded from underlying rock, then transported deposited. In places, they exceed 1000 ft (330 m) thickness. Where the sediment absent, either exposed or has been weathered to produce residual soil. For conterminous United States, map Soller Reheis (2004, scale 1:5,000,000; http://pubs.usgs.gov/of/2003/of03-275/) shows...