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Year Published: 2015

Early Holocene Great Salt Lake

Shorelines and surficial deposits (including buried forest-floor mats and organic-rich wetland sediments) show that Great Salt Lake did not rise higher than modern lake levels during the earliest Holocene (11.5–10.2 cal ka BP; 10–9 14C ka BP). During that period, finely laminated, organic-rich muds (sapropel) containing brine-shrimp cysts and...

Oviatt, Charles G.; Madsen, David B.; Miller, David M.; Thompson, Robert S.; McGeehin, John P.
Oviatt, C.G., Madsen, D.B., Miller, D.M., Thompson, R.S., and McGeehin, J.P., 2015, Early Holocene Great Salt Lake, USA: Quaternary Research, v. 84, p. 57-68. [doi:10.1016/j.yqres.2015.05.001]

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Year Published: 2015

Paleodischarge of the Mojave River, southwestern U.S.A, investigated with single-pebble measurements of 10Be

The paleohydrology of ephemeral stream systems is an important constraint on paleoclimatic conditions in arid environments, but remains difficult to constrain quantitatively. For example, sedimentary records of the size and extent of pluvial lakes in the Mojave Desert have been used as a proxy for Quaternary climate variability. Although the...

Cyr, Andrew J.; Miller, David M.; Mahan, Shannon A.

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Year Published: 2015

Geologic map of the Vashon 7.5' quadrangle and selected areas, King County, Washington

This map is an interpretation of a 6-ft-resolution lidar-derived digital elevation model combined with geology by Derek B. Booth and Kathy Goetz Troost. Field work by Booth and Troost was located on the 1:24,000-scale topographic map of the Vashon and Des Moines 7.5' quadrangles that were published in 1997 and 1995, respectively. Much of the...

Booth, Derek B.; Troost, Kathy Goetz; Tabor, Rowland W.
Booth, D.B., Troost, K.G., and Tabor, R.W., 2015, Geologic map of the Vashon 7.5' quadrangle and selected areas, King County, Washington: U.S. Geological Survey Scientific Investigations Map 3328, pamphlet 11 p., scale 1:24,000, http://dx.doi.org/10.3133/sim3328.

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Year Published: 2015

Geologic map of the Julian 7.5' quadrangle, San Diego County, California

The Julian 7.5' quadrangle lies within the Jurassic-Cretaceous Peninsular Ranges batholith of southern California and Baja California. Four granitic plutonic units and one gabbroic unit, most comprising a number of individual plutons, have been mapped in the Julian quadrangle and informal names have been assigned. The formal name Cuyamaca Gabbro...

Todd, Victoria R.

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Year Published: 2015

Magmatism and Epithermal Gold-Silver Deposits of the Southern Ancestral Cascade Arc, Western Nevada and Eastern California

Many epithermal gold-silver deposits are temporally and spatially associated with late Oligocene to Pliocene magmatism of the southern ancestral Cascade arc in western Nevada and eastern California. These deposits, which include both quartz-adularia (low- and intermediate-sulfidation; Comstock Lode, Tonopah, Bodie) and quartz-alunite (high-...

John, David A.; du Bray, Edward A.; Henry, Christopher D.; Vikre, Peter G.

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Year Published: 2015

Storm-influenced deltaic deposits of the Middle Jurassic Gaikema Sandstone in a measured section on the northern Iniskin Peninsula, Cook Inlet basin, Alaska

Middle Jurassic strata of the Gaikema Sandstone were deposited about 170 million years ago on a delta that was located on the western shoreline of the Cook Inlet basin (Detterman and Hartsock, 1966; LePain and others, 2011, 2013). The delta was built by swift, sediment-laden rivers that flowed southeastward from a mountainous volcanic terrane west...

Stanley, Richard G.; Helmold, Kenneth P.; LePain, David L.
Stanley, R.G., Helmold, K.P., and LePain, D.L., 2015, Storm-influenced deltaic deposits of the Middle Jurassic Gaikema Sandstone in a measured section on the northern Iniskin Peninsula, Cook Inlet basin, Alaska, in Wartes, M.A., Energy-related studies during the 2014 field season, western Cook Inlet, Alaska: Alaska Division of Geological and Geophysical Surveys Preliminary Interpretive Report 2015-5-6, p. 29-42. doi:10.14509/29461, http://dggs.alaska.gov/pubs/id/29461

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Year Published: 2015

Geotechnical soil characterization of intact Quaternary deposits forming the March 22, 2014 SR-530 (Oso) landslide, Snohomish County, Washington

During the late morning of March 22, 2014, a devastating landslide occurred near the town of Oso, Washington. The landslide with an estimated volume of 10.9 million cubic yards (8.3 x 106 m3) of both intact glacially deposited and previously disturbed landslide sediments, reached speeds averaging 40 miles per hour (64 kilometers per hour) and...

Riemer, Michael F.; Collins, Brian D.; Badger, Thomas C.; Toth, Csilla; Yu, Yat Chun
Riemer, M.F., Collins, B.D., Badger, T.C., Toth, C., and Yat Chun, Y., 2015, Geotechnical soil characterization of intact Quaternary deposits forming the March 22, 2014 SR-530 (Oso) landslide, Snohomish County, Washington: U.S. Geological Survey Open-File Report 2015-1089, 17 p., http://dx.doi.org/10.3133/ofr20151089.

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Year Published: 2015

Identifying multiple timescale rainfall controls on Mojave Desert ecohydrology using an integrated data and modeling approach for Larrea tridentata

The perennial shrub Larrea tridentata is widely successful in North American warm deserts but is also susceptible to climatic perturbations. Understanding its response to rainfall variability requires consideration of multiple timescales. We examine intra-annual to multi-year relationships using model simulations of soil moisture and...

Ng, Gene-Hua Crystal; Bedford, David R.; Miller, David M.

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Year Published: 2015

1000 dams down and counting

Forty years ago, the demolition of large dams was mostly fiction, notably plotted in Edward Abbey's novel The Monkey Wrench Gang. Its 1975 publication roughly coincided with the end of large-dam construction in the United States. Since then, dams have been taken down in increasing numbers as they have filled with sediment, become unsafe...

O'Connor, James E.; Duda, Jeff J.; Grant, Gordon E.

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Year Published: 2015

Mesozoic magmatism and timing of epigenetic Pb-Zn-Ag mineralization in the western Fortymile mining district, east-central Alaska: Zircon U-Pb geochronology, whole-rock geochemistry, and Pb isotopes

The Mesozoic magmatic history of the North American margin records the evolution from a more segmented assemblage of parautochthonous and allochthonous terranes to the more cohesive northern Cordilleran orogenic belt. We characterize the setting of magmatism, tectonism, and epigenetic mineralization in the western Fortymile mining district, east-...

Dusel-Bacon, Cynthia; Aleinkoff, J.N.; Day, W.C.; Mortensen, J.K.
Dusel-Bacon, C., Aleinikoff, J.N., Day, W.C., and Mortensen, J.K., 2015, Mesozoic magmatism and timing of epigenetic Pb-Zn-Ag mineralization in the western Fortymile mining district, east-central Alaska: Zircon U-Pb geochronology, whole-rock geochemistry, and Pb isotopes: Geosphere, v. 11, no. 3, p. 786–822, doi:10.1130/GES01092.1.

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Year Published: 2015

A summary of data collected by the U.S. Geological Survey at Dasht-e-Nawar, Afghanistan, in support of lithium exploration, June-September 2014

The playa of the Dasht-e-Nawar basin, east-central Afghanistan, has historically been investigated for potential evaporate mineral deposits. In 2014, the U.S. Department of Defense Task Force for Business and Stability Operations contracted Centar American and SRK Consulting, Inc. to assess a potential lithium (Li) brine resource, conduct a basin...

Stillings, Lisa L.; Mack, Thomas J.; Chornack, Michael P.; Kalaly, Siddiq S.; Ahmadi, M. Idrees; Akbar, A. Qasim
Stillings, L.L., Mack, T.J., Chornack, M.P., Kalaly, S.S., Ahmadi, M.I., and Akbar, A.Q., 2015, A summary of data collected by the U.S. Geological Survey at Dasht-e-Nawar, Afghanistan, in support of lithium exploration, June–September 2014: U.S. Geological Survey Open-File Report 2015–1059, 70 p., http://dx.doi.org/10.3133/ofr20151059.

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Year Published: 2015

Comparing activated alumina with indigenous laterite and bauxite as potential sorbents for removing fluoride from drinking water in Ghana

Fluoride is considered beneficial to teeth and bones when consumed in low concentrations, but at elevated concentrations it can cause dental and skeletal fluorosis. Most fluoride-related health problems occur in poor, rural communities of the developing world where groundwater fluoride concentrations are high and the primary sources of drinking...

Craig, Laura; Stillings, Lisa; Decker, David L.; Thomas, James M.
Laura Craig, Lisa L. Stillings, David L. Decker, James M. Thomas, Comparing activated alumina with indigenous laterite and bauxite as potential sorbents for removing fluoride from drinking water in Ghana, Applied Geochemistry, Volume 56, 2015, Pages 50-66, ISSN 0883-2927, http://dx.doi.org/10.1016/j.apgeochem.2015.02.004.