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Year Published: 2014

Preliminary geologic map of Black Canyon and surrounding region, Nevada and Arizona

Thermal springs in Black Canyon of the Colorado River, downstream of Hoover Dam, are important recreational, ecological, and scenic features of the Lake Mead National Recreation Area. This report presents the results from a U.S. Geological Survey study of the geologic framework of the springs. The study was conducted in cooperation with the...

Felger, Tracey J.; Beard, L. Sue; Anderson, Zachary W.; Fleck, Robert J.; Wooden, Joseph L.; Seixas, Gustav B.
Preliminary geologic map of Black Canyon and surrounding region, Nevada and Arizona; 2014; OFR; 2013-1267-A; Felger, Tracey J.; Beard, L. Sue; Anderson, Zachary W.; Fleck, Robert J.; Wooden, Joseph L.; Seixas, Gustav B.

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Year Published: 2014

Historical channel-planform change of the Little Colorado River near Winslow, Arizona

This study evaluates channel-planform adjustment on an alluvial reach of the Little Colorado River and documents the geomorphic evolution of the channel through an analysis of aerial photographs and orthophotographs for the period 1936–2010. The Little Colorado River has adjusted to the effects of an extreme flood in 1923 and a subsequent decline...

Block, Debra L.
Historical channel-planform change of the Little Colorado River near Winslow, Arizona; 2014; SIR; 2014-5112; Block, Debra

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Year Published: 2014

Preliminary geologic map of the eastern Willapa Hills, Cowlitz, Lewis, and Wahkiakum Counties, Washington

This digital map database and the PDF derived from the database were created from the analog geologic map: Wells, R.E. (1981), “Geologic map of the eastern Willapa Hills, Cowlitz, Lewis, and Wahkiakum Counties, Washington.” The geodatabase replicates the geologic mapping of the 1981 report with minor exceptions along water boundaries and also...

Wells, Ray E.; Sawlan, Michael G.
Preliminary geologic map of the eastern Willapa Hills, Cowlitz, Lewis, and Wahkiakum Counties, Washington; 2014; OFR; 2014-1063; Wells, Ray E.; Sawlan, Michael G.

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Year Published: 2014

Comments on the Yule Marble Haines block: potential replacement, Tomb of the Unknown Soldier, Arlington National Cemetery

Marble for the Tomb of the Unknown Soldier at Arlington National Cemetery was cut from the Colorado Yule Marble Quarry in 1931. Although anecdotal reports suggest that cracks were noticed in the main section of the monument shortly after its installation at the Arlington National Cemetery in Arlington, Virginia, detailed documentation of the...

Mossotti, Victor G.
Comments on the Yule Marble Haines block: potential replacement, Tomb of the Unknown Soldier, Arlington National Cemetery; 2014; OFR; 2013-1182; Mossotti, Victor G.

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Year Published: 2014

Linking rapid magma reservoir assembly and eruption trigger mechanisms at evolved Yellowstone-type supervolcanoes

The geological record contains evidence of volcanic eruptions that were as much as two orders of magnitude larger than the most voluminous eruption experienced by modern civilizations, the A.D. 1815 Tambora (Indonesia) eruption. Perhaps nowhere on Earth are deposits of such supereruptions more prominent than in the Snake River Plain–...

Wotzlaw, J.F.; Bindeman, I.N.; Watts, Kathryn E.; Schmitt, A.K.; Caricchi, L.; Schaltegger, U.
Jörn-Frederik Wotzlaw, Ilya N. Bindeman, Kathryn E. Watts, Axel K. Schmitt, Luca Caricchi, and Urs Schaltegger. Linking rapid magma reservoir assembly and eruption trigger mechanisms at evolved Yellowstone-type supervolcanoes. Geology, September 2014, v. 42, p. 807-810.

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Year Published: 2014

A mechanistic modeling and data assimilation framework for Mojave Desert ecohydrology

This study demonstrates and addresses challenges in coupled ecohydrological modeling in deserts, which arise due to unique plant adaptations, marginal growing conditions, slow net primary production rates, and highly variable rainfall. We consider model uncertainty from both structural and parameter errors and present a mechanistic model for the...

Ng, Gene-Hua Crystal.; Bedford, David; Miller, David M.
Ng, G.-H. C., Bedford, D. R., & Miller, D. M. (2014, June). A mechanistic modeling and data assimilation framework for Mojave Desert ecohydrology. Water Resources Research. Wiley-Blackwell. https://doi.org/10.1002/2014wr015281

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Year Published: 2014

Interpretations of evidence for large Pleistocene paleolakes in the Bonneville basin, western North America: COMMENT on: Bonneville basin shoreline records of large lake intervals during marine isotope stage 3 and the last glacial maximum, by Nishizawa et al. (2013)

Nishizawa et al. (2013) argue in support of three large paleolakes in the Bonneville basin during Marine Oxygen Isotope Stage 3 (MIS 3). If true, that would be an important contribution to paleoclimate investigations. However, the key evidence in support of their argument consists of four radiocarbon ages that are out of stratigraphic order and...

Oviatt, Charles G.; Chan, Margorie A.; Jewell, Paul W.; Bills, Bruce G.; Madsen, David B.; Miller, David M.
Oviatt, C. G., Chan, M. A., Jewell, P. W., Bills, B. G., Madsen, D. B., & Miller, D. M. (2014, May). Interpretations of evidence for large Pleistocene paleolakes in the Bonneville basin, western North America. Palaeogeography, Palaeoclimatology, Palaeoecology. Elsevier BV. https://doi.org/10.1016/j.palaeo.2014.03.003

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Year Published: 2014

Preliminary bedrock and surficial geologic map of the west half of the Sanders 30' x 60' quadrangle, Navajo and Apache Counties, northern Arizona

The bedrock and surficial geologic map of the west half of the Sanders 30' x 60' quadrangle was completed in a cooperative effort of the U.S. Geological Survey (USGS) and the Navajo Nation to provide regional geologic information for management and planning officials. This report provides baseline geologic information that will be useful in future...

Amoroso, Lee; Priest, Susan S.; Hiza-Redsteer, Margaret
Preliminary bedrock and surficial geologic map of the west half of the Sanders 30' x 60' quadrangle, Navajo and Apache Counties, northern Arizona; 2014; OFR; 2014-1124; Amoroso, Lee; Priest, Susan S.; Hiza-Redsteer, Margaret

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Year Published: 2014

Geologic history of Siletzia, a large igneous province in the Oregon and Washington Coast Range: correlation to the geomagnetic polarity time scale and implications for a long-lived Yellowstone hotspot

Siletzia is a basaltic Paleocene and Eocene large igneous province in coastal Oregon, Washington, and southern Vancouver Island that was accreted to North America in the early Eocene. New U-Pb magmatic, detrital zircon, and 40Ar/39Ar ages constrained by detailed field mapping, global nannoplankton zones, and magnetic polarities allow correlation...

Wells, Ray; Bukry, David; Friedman, Richard; Pyle, Douglas; Duncan, Robert; Haeussler, Peter J.; Wooden, Joe
Geologic history of Siletzia, a large igneous province in the Oregon and Washington Coast Range: correlation to the geomagnetic polarity time scale and implications for a long-lived Yellowstone hotspot; 2014; Article; Journal; Geosphere; Wells, Ray; Bukry, David; Friedman, Richard; Pyle, Douglas; Duncan, Robert; Haeussler, Peter; Wooden, Joe

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Year Published: 2014

Geologic map and upper Paleozoic stratigraphy of the Marble Canyon area, Cottonwood Canyon quadrangle, Death Valley National Park, Inyo County, California

This geologic map and pamphlet focus on the stratigraphy, depositional history, and paleogeographic significance of upper Paleozoic rocks exposed in the Marble Canyon area in Death Valley National Park, California. Bedrock exposed in this area is composed of Mississippian to lower Permian (Cisuralian) marine sedimentary rocks and the Jurassic...

Stone, Paul; Stevens, Calvin H.; Belasky, Paul; Montañez, Isabel P.; Martin, Lauren G.; Wardlaw, Bruce R.; Sandberg, Charles A.; Wan, Elmira; Olson, Holly A.; Priest, Susan S.
Geologic map and upper Paleozoic stratigraphy of the Marble Canyon area, Cottonwood Canyon quadrangle, Death Valley National Park, Inyo County, California; 2014; SIM; 3298; Stone, Paul; Stevens, Calvin H.; Belasky, Paul; Montañez, Isabel P.; Martin, Lauren G.; Wardlaw, Bruce R.; Sandberg, Charles A.; Wan, Elmira; Olson, Holly A.; Priest, Susan S.

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Year Published: 2014

Steady incision of Grand Canyon at the million year timeframe: a case for mantle-driven differential uplift

The Grand Canyon region provides an excellent laboratory to examine the interplay between river incision, magmatism, and the geomorphic and tectonic processes that shape landscapes. Here we apply U-series, Ar–Ar, and cosmogenic burial dating of river terraces to examine spatial variations in incision rates along the 445 km length of the...

Crow, Ryan S.; Karl Karlstrom; Laura Crossey; Richard Young; Michael Ort; Asmerom, Yemane; Victor Polyak; Andrew Darling

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Year Published: 2014

Relationship between porphyry copper occurrences, crustal preservation levels, and amount of exploration in magmatic belts of the Central Tethys region

A probabilistic assessment of undiscovered resources in porphyry copper deposits in the Central Tethys region of Turkey, the Caucasus, Iran, western Pakistan, and southern Afghanistan was conducted as part of a U.S.G.S. global mineral resource assessment. The purpose was to delineate areas as permissive tracts for the occurrence of porphyry Cu-Mo...

Zürcher, Lukas; Bookstrom, Arthur A.; Hammarstrom, Jane M.; Mars, John C.; Ludington, Stephen; Zientek, Michael L.; Dunlap, Pamela; Wallis, John C.
ZÜRCHER, L., BOOKSTROM, A. A., HAMMARSTROM, J. M., MARS, L. J. C., LUDINGTON, S., ZIENTEK, M. L., DUNLAP, P. and WALLIS, J. C. (2014), Relationship between Porphyry Copper Occurrences, Crustal Preservation Levels, and Amount of Exploration in Magmatic Belts of the Central Tethys Region. Acta Geologica Sinica - English Edition, 88: 572–573. doi:10.1111/1755-6724.12374_35