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Year Published: 2017

The Evergreen basin and the role of the Silver Creek fault in the San Andreas fault system, San Francisco Bay region, California

The Evergreen basin is a 40-km-long, 8-km-wide Cenozoic sedimentary basin that lies mostly concealed beneath the northeastern margin of the Santa Clara Valley near the south end of San Francisco Bay (California, USA). The basin is bounded on the northeast by the strike-slip Hayward fault and an approximately parallel subsurface fault that is...

Jachens, Robert C.; Wentworth, Carl M.; Graymer, Russell W.; Williams, Robert; Ponce, David A.; Mankinen, Edward A.; Stephenson, William J.; Langenheim, Victoria
R.C. Jachens, C.M. Wentworth, R.W. Graymer, R.A. Williams, D.A. Ponce, E.A. Mankinen, W.J. Stephenson, and V.E. Langenheim The Evergreen basin and the role of the Silver Creek fault in the San Andreas fault system, San Francisco Bay region, California Geosphere, April 2017, v. 13, p. 269-286

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Year Published: 2017

Reconnaissance sedimentology of selected tertiary exposures in the upland region bordering the Yukon Flats basin, east-central Alaska

This report summarizes reconnaissance sedimentologic and stratigraphic observations made during six days of helicopter-supported fieldwork in 2002 on Tertiary sedimentary rocks exposed in the upland region around the flanks of the Yukon Flats basin in east-central Alaska (fig. 1). This project was a cooperative effort between the Alaska Division...

LePain, David L.; Stanley, Richard G.
LePain, D.L., and Stanley, R.G., 2017, Reconnaissance sedimentology of selected Tertiary exposures in the upland region bordering the Yukon Flats basin, east-central Alaska: LePain, D.L., and Stanley, R.G., 2017, Reconnaissance sedimentology of selected Tertiary exposures in the upland region bordering the Yukon Flats basin, east-central Alaska: Alaska Division of Geological & Geophysical Surveys Preliminary Interpretive Report 2016-6, 14 p. http://doi.org/10.14509/29700 Preliminary Interpretive Report 2016-6, 14 p. http://doi.org/10.14509/29700

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Year Published: 2017

Geologic map of the Providence Mountains in parts of the Fountain Peak and adjacent 7.5' quadrangles, San Bernardino County, California

IntroductionThe Providence Mountains are in the eastern Mojave Desert about 60 km southeast of Baker, San Bernardino County, California. This range, which is noted for its prominent cliffs of Paleozoic limestone, is part of a northeast-trending belt of mountainous terrain more than 100 km long that also includes the Granite Mountains, Mid Hills,...

Stone, Paul; Miller, David M.; Stevens, Calvin H.; Rosario, Jose J.; Vazquez, Jorge A.; Wan, Elmira; Priest, Susan S.; Valin, Zenon C.
Stone, Paul, Miller, D.M., Stevens, C.H., Rosario, Jose, Vazquez, J.A., Wan, Elmira, Priest, S.S., and Valin, Z.C., 2017, Geologic map of the Providence Mountains in parts of the Fountain Peak and adjacent 7.5' quadrangles, San Bernardino County, California: U.S. Geological Survey Scientific Investigations Map 3376, pamphlet 52 p., scale 1:24,000, https://doi.org/10.3133/sim3376.

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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