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Year Published: 2017

Paleomagnetism and 40Ar/39Ar geochronology of the Plio-Pleistocene Boring Volcanic Field: Implications for the geomagnetic polarity time scale and paleosecular variation

Paleomagnetic directions and 40Ar/39Ar ages have been determined for samples of lava flows from the same outcrops, where possible, for 84 eruptive units ranging in age from 3200 ka to 60 ka within the Boring Volcanic Field (BVF) of the Pacific Northwest, USA. This study expands upon our previous results for the BVF, and compares the...

Hagstrum, Jonathan T.; Fleck, Robert J.; Evarts, Russell C.; Calvert, Andrew T.
Hagstrum, JT, Fleck, RJ, Evarts, RC, and Calvert, AT (2017) Paleomagnetism and 40Ar/39Ar geochronology of the Plio-Pleistocene Boring Volcanic Field: Implications for the geomagnetic polarity time scale and paleosecular variation. Physics of the Earth and Planetary Interiors, 262:101-115, https://doi.org/10.1016/j.pepi.2016.07.008.

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Year Published: 2017

Geologic map of the Bateman Spring Quadrangle, Lander County, Nevada

This 1:24,000-scale geologic map of the Bateman Spring 7.5-minute quadrangle in Lander County, Nevada contains descriptions of 24 geologic units and one cross section. Accompanying text includes full unit descriptions and references. This quadrangle includes lower Paleozoic siliciclastic sedimentary rocks of the Roberts Mountain allochthon,...

Ramelli, Alan R.; Wrucke, Chester T.; House, P. Kyle
Ramelli, A.R., Wrucke, C.T., and House, P.K., 2017, Geologic map of the Bateman Spring quadrangle, Lander County, Nevada [digital files, 238 MB]: Nevada Bureau of Mines and Geology Map 185, scale 1:24,000, 6 p.

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Year Published: 2017

Influence of the Eastern California Shear Zone on deposition of the Mio-Pliocene Bouse Formation: Insights from the Cibola area, Arizona

The Eastern California Shear Zone (ECSZ) is a wide zone of late Cenozoic strike-slip faults and related diffuse deformation that currently accommodates ~20–25% of relative Pacific–North America plate motion in the lower Colorado River region (Fig. 1A; Dokka and Travis, 1990; Miller et al., 2001; Guest et al., 2007; Mahan et al., 2009). The ECSZ is...

Dorsey, Rebecca J.; O'Connell, Brennan; Homan, Mindy B.; Bennett, Scott E. K.
Dorsey, R.J., O’Connell, B., Homan, M.B., Bennett, S.E.K., 2017, Influence of the Eastern California Shear Zone on Deposition of the Mio-Pliocene Bouse Formation: Insights From the Cibola Area, Arizona, in Reynolds, R.E. eds., Proceedings for the 2017 Desert Symposium, p. 150-157.

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Year Published: 2017

Tectonic evolution

The middle Paleozoic through Present tectonic evolution of the Northern Cordillera is portrayed in a series of 15 Tectonic Model figures. These figures depict the successive stages of formation and accretion of orogenic collages along the western margin of the North American Plate (craton and craton margin) and adjacent marine areas. The orogenic...

Nokleberg, Warren J.; Monger, James W.H.; Stone, David B.; Bundtzen, Thomas K.; Scholl, David W.

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Year Published: 2017

Excursions in fluvial (dis)continuity

Lurking below the twin concepts of connectivity and disconnectivity are their first, and in some ways, richer cousins: continuity and discontinuity. In this paper we explore how continuity and discontinuity represent fundamental and complementary perspectives in fluvial geomorphology, and how these perspectives inform and underlie our conceptions...

Grant, Gordon E.; O'Connor, James E.; Safran, Elizabeth

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Year Published: 2017

Larval aquatic insect responses to cadmium and zinc in experimental streams

To evaluate the risks of metal mixture effects to natural stream communities under ecologically relevant conditions, the authors conducted 30-d tests with benthic macroinvertebrates exposed to cadmium (Cd) and zinc (Zn) in experimental streams. The simultaneous exposures were with Cd and Zn singly and with Cd+Zn mixtures at environmentally...

Mebane, Christopher A.; Schmidt, Travis S.; Balistrieri, Laurie S.
Mebane, C.A., T.S. Schmidt, and L.S. Balistrieri. 2016. Larval aquatic insect responses to cadmium and zinc in experimental streams. Environmental Toxicology and Chemistry. http://dx.doi.org/10.1002/etc.3599

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Year Published: 2017

Dating of Pliocene Colorado River sediments: Implications for cosmogenic burial dating and the evolution of the lower Colorado River

We applied cosmogenic 26Al/10Be burial dating to sedimentary deposits of the ancestral Colorado River. We compared cosmogenic burial ages of sediments to the age of an independently well-dated overlying basalt flow at one site, and also applied cosmogenic burial dating to sediments with less precise independent age constraints. All dated...

Howard, Keith A.; Matmon, Ari; Stock, Greg M.; Granger, Darryl E.
Matmon, A., Stock, G. M., Granger, D. E., & Howard, K. A. (2011). Dating of Pliocene Colorado River sediments: Implications for cosmogenic burial dating and the evolution of the lower Colorado River. Geological Society of America Bulletin, 124(3–4), 626–640

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Year Published: 2017

Lidar-Based Rock-Fall Hazard Characterization of Cliffs

Rock falls from cliffs and other steep slopes present numerous challenges for detailed geological characterization. In steep terrain, rock-fall source areas are both dangerous and difficult to access, severely limiting the ability to make detailed structural and volumetric measurements necessary for hazard assessment. Airborne and terrestrial...

Collins, Brian D.; Greg M.Stock

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Year Published: 2017

Geology of Seattle, a field trip

Seattle’s geologic record begins with Eocene deposition of fluvial arkosic sandstone and associated volcanic rocks of the Puget Group, perhaps during a time of regional strike-slip faulting, followed by late Eocene and Oligocene marine deposition of the Blakeley Formation in the Cascadia forearc. Older Quaternary deposits are locally exposed.Most...

Haugerud, Ralph A.; Kelsey, Harvey M.; Haugerud, Ralph A.; Troost, Kathy Goetz; Laprade, William T.

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Year Published: 2016

Regional geophysics of western Utah and eastern Nevada, with emphasis on the Confusion Range

As part of a long term geologic and hydrologic study of several regional groundwater flow systems in western Utah and eastern Nevada, the U.S. Geological Survey was contracted by the Southern Nevada Water Authority to provide geophysical data. The primary object of these data was to enable construction of the geological framework of the flow...

Mankinen, Edward A.; Rowley, Peter D.; Dixon, Gary L.; McKee, Edwin H.
Mankinen, E.A., Rowley, P.D., Dixon, G.L., and McKee, E.H., 2016, Regional geophysics of western Utah and eastern Nevada, with emphasis on the Confusion Range, in Comer, J.B., Inkenbrandt, P.C., Krahulec, K.A., and Pinnell, M.L., editors, Resources and Geology of Utah's West Desert: Utah Geologic Association Publication 45, p. 147-166.

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Year Published: 2016

Paleogeographic implications of Late Miocene lacustrine and nonmarine evaporite deposits in the Lake Mead region: Immediate precursors to the Colorado River

Thick late Miocene nonmarine evaporite (mainly halite and gypsum) and related lacustrine limestone deposits compose the upper basin fill in half grabens within the Lake Mead region of the Basin and Range Province directly west of the Colorado Plateau in southern Nevada and northwestern Arizona. Regional relations and geochronologic data indicate...

Faulds, James E.; Schreiber, Charlotte; Langenheim, Victoria; Hinz, Nicholas H.; Shaw, Tom; Heizler, Matthew T.; Perkins, Michael E; El Tabakh, Mohammed; Kunk, Michael J.