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The USGS maintains a variety of high quality, state-of-the-art scientific facilities that provide analytical capabilities, scientific support functions, experimental and modeling expertise, and field capabilities. Two of these facilities are housed in Denver, Colorado at the Federal Center and at Stanford University near the Menlo Park USGS campus.

Filter Total Items: 4
Date published: March 3, 2016

SHRIMP-RG

SHRIMP-RG stands for Sensitive High-Resolution Ion Microprobe with Reverse Geometry. We are committed to making SHRIMP-RG available to the scientific community and seek projects that require spatially resolved measurements and benefit from SHRIMP-RG's unique combination of high secondary transmission and high mass resolving power.

Date published: March 3, 2016

TRIGA Reactor

We operate a low–enriched uranium–fueled, pool–type reactor, the Geological Survey TRIGA® Reactor, to support science by providing information on geologic, plant, and animal specimens to advance methods and techniques unique to nuclear reactors. Samples from around the world are submitted to the USGS for analysis using the reactor facility.

Date published: March 3, 2016

National Ice Core Laboratory

The U.S. National Ice Core Laboratory is a facility for storing, curating, and studying ice cores recovered from the polar regions of the world. It provides scientists with the capability to conduct examinations and measurements on ice cores, and it preserves the integrity of these ice cores in a repository for current and future investigations.

Date published: March 3, 2016
Status: Active

Denver Microbeam Laboratory

The laboratory capabilities include imaging, x-ray analysis, x-ray mapping, image processing, and optical microscopy.

Filter Total Items: 1,174
Year Published: 2018

Thermally induced fracture of macroscale surficial granite sheets

Geologically diverse landforms around the world show indications of energetic macroscale fracture. These fractures are sometimes displayed dramatically as so-called “A-tents”, whereby relatively thin rock sheets push upwards and fracture, forming tent-like voids beneath the ruptured sheets. The origin and formation of such features has been a...

Collins, Brian D.; Stock, Greg M.; Eppes, Martha C.
Collins, B.D., Stock, G.M., and Eppes, M.C., 2018. Thermally induced fracture of macroscale surficial granite sheets, In Proceedings of the 2018 Annual Meeting of the American Rock Mechanics Association, Seattle, Washington.

Year Published: 2018

Geologic map of the Castle Rock 7.5' quadrangle, Arizona and California

The Castle Rock quadrangle is in the northeast corner of Chemehuevi Valley, California and Arizona. It includes the Colorado River’s entrance to the valley at the mouth of Topock Gorge and the northern outskirts of Lake Havasu City, Arizona, and the Chemehuevi Indian Tribe community of Havasu Lake, California. The map includes large parts of the...

House, P. Kyle; John, Barbara E.; Malmon, Daniel V.; Block, Debra; Beard, L. Sue; Felger, Tracey J.; Crow, Ryan S.; Schwing, Jonathan E.; Cassidy, Colleen E.
House, P.K., John, B.E., Malmon, D.V., Block, D., Beard, L.S., Felger, T.J., Crow, R.S., Schwing, J.E., and Cassidy, C.E., 2018, Geologic map of the Castle Rock 7.5' quadrangle, Arizona and California: U.S. Geological Survey Scientific Investigations Map 3411, scale 1:24,000, pamphlet 15 p., https://doi.org/10.3133/sim3411.

Year Published: 2018

Framework geologic map and structure sections along the Bartlett Springs Fault Zone and adjacent area from Round Valley to Wilbur Springs, northern Coast Ranges, California

The geologic map and accompanying report describes the extent, complexity, architecture, and evolution of the Bartlett Springs Fault Zone between Clear Lake and Round Valley, California. This fault zone is the eastern-most known active member of the San Andreas transform margin in northern California. It is of particular interest for its apparent...

McLaughlin, Robert J.; Moring, Barry C.; Hitchcock, Christopher S.; Valin, Zenon C.
McLaughlin, R.J., Moring, B.C., Hitchcock, C.S., and Valin, Z.C., 2018, Framework geologic map and structure sections along the Bartlett Springs Fault Zone and adjacent area from Round Valley to Wilbur Springs, northern Coast Ranges, California: U.S. Geological Survey, Scientific Investigations Map 3395, scale 1:100,000, pamphlet 60 p., https://doi.org/10.3133/sim3395.

Year Published: 2018

Bedrock mapping and seismic hazard assessment at Gold Basin landslide, Washington

The Gold Basin landslide is located along the South Fork Stillaguamish River, within the Mount Baker-Snoqualmie National Forest in western Washington State. Recent concerns related to slope stability after the 2014 State Route 530 Landslide near Oso, Washington, forced the closure of the U.S. Forest Service Gold Basin Campground in May of 2014. In...

Staisch, Lydia M.
Staisch, L.M., 2018, Bedrock mapping and seismic hazard assessment at Gold Basin landslide, Washington: U.S. Geological Survey Open-File Report 2018–1132, 19 p., https://doi.org/10.3133/ofr20181132.

Year Published: 2018

Geology and geologic history: Overview of the geology of the San Francisco Bay region

The geology of San Francisco and the surrounding northern and central California area has played a pivotal role in the development of our understanding of Earth processes, especially the process of tectonic accretion at a continental margin and the development of transform plate margins. The Franciscan Complex, which underlies most (or perhaps...

Johnson, A. Kenneth; Bartow, Greg W.; Graymer, Russell

Year Published: 2018

Flushing of the deep Pacific Ocean and the deglacial rise of atmospheric CO2 concentrations

During the last deglaciation (19,000–9,000 years ago), atmospheric CO2increased by about 80 ppm. Understanding the mechanisms responsible for this change is a central theme of palaeoclimatology, relevant for predicting future CO2 transfers in a warming world. Deglacial CO2 rise hypothetically tapped an accumulated deep Pacific carbon...

Du, Jianghui; Haley, Brian; Mix, Alan; Walczak, Maureen; Praetorius, Summer K.
Du, J., Haley, B., Mix, A., Walczak, M., Praetorius, S: Flushing of the deep Pacific Ocean and the deglacial rise of atmospheric CO2 concentrations. Nature Geoscience. 10.1038/s41561-018-0205-6 (2018)

Year Published: 2018

Global and Arctic climate sensitivity enhanced by changes in North Pacific heat flux

Arctic amplification is a consequence of surface albedo, cloud, and temperature feedbacks, as well as poleward oceanic and atmospheric heat transport. However, the relative impact of changes in sea surface temperature (SST) patterns and ocean heat flux sourced from different regions on Arctic temperatures are not well constrained. We modify ocean-...

Praetorius, Summer K.; Rugenstein, Maria A.; Persad, Geeta; Caldeira, Ken
Praetorius, S., Rugenstein, M. Persad, G. Caldeira, K. Global and Arctic climate sensitivity enhanced by changes in North Pacific heat flux, Nature Communications 9: 3124 (2018).

Year Published: 2018

Carving Grand Canyon’s inner gorge: A test of steady incision versus rapid knickzone migration

A recent study posits that much of the 240-m-deep inner gorge of Grand Canyon was carved between 500 and 400 ka via passage of a migrating knickzone with incision rates of ~1600 m/Ma during that time period; this was based on dating of a ca. 500 ka travertine deposit perched on the rim of the inner gorge, near Hermit Rapid, and a ca. 400 ka...

Crow, Ryan S.; Karlstrom, Karl E.; Crossey, Laura J.; Polyak, Victor; Asmerom, Yemane; McIntosh, William C.
Ryan S. Crow, Karl E. Karlstrom, Laura J. Crossey, Victor J. Polyak, Yemane Asmerom, William C. McIntosh; Carving Grand Canyon’s inner gorge: A test of steady incision versus rapid knickzone migration. Geosphere doi: https://doi.org/10.1130/GES01562.1

Year Published: 2018

Outburst floods provide erodability estimates consistent with long-term landscape evolution

Most current models for the landscape evolution over geological timescales are based on semi-empirical laws that consider riverbed incision proportional to rock erodability (dependent on lithology) and to the work performed by water flow (stream power). However, the erodability values obtained from these models are entangled with poorly known...

Garcia-Castellanos, Daniel; O'Connor, Jim E.
Garcia-Castellanos, D., and O'Connor, J.E., 2018, Outburst floods provide erodability estimates consistent with long-term landscape evolution: Scientific Reports, https://doi.org/10.1038/s41598-018-28981-y.

Year Published: 2018

Breaching of strike-slip faults and successive flooding of pull-apart basins to form the Gulf of California seaway from ca. 8–6 Ma

The geologic record of the formation of marine basins during continental rifting is uncommonly preserved. Using GIS-based paleotectonic maps, we show that marine basin formation in the Gulf of California–Salton trough oblique rift (Mexico and the United States) occurred in a stepwise manner as crustal thinning lowered elevations within the Gulf of...

Umhoefer, Paul J.; Darin, Michael H.; Bennett, Scott E. K.; Skinner, Lisa A.; Dorsey, Rebecca J.; Oskin, Michael E.
Umhoefer, P. J., Darin, M. H., Bennett, S. E., Skinner, L. A., Dorsey, R. J., & Oskin, M. E. (2018). Breaching of strike-slip faults and successive flooding of pull-apart basins to form the Gulf of California seaway from ca. 8–6 Ma. Geology, 46(8), 695-698.

Year Published: 2018

Geochemical characterization and modeling of regional groundwater contributing to the Verde River, Arizona between Mormon Pocket and the USGS Clarkdale gage

We use synoptic surveys of stream discharge, stable isotopes, and dissolved noble gases to identify the source of groundwater discharge to the Verde River in central Arizona. The Verde River more than doubles in discharge in Mormon Pocket over a 1.4 km distance that includes three discrete locations of visible spring input to the river and other...

Beisner, Kimberly R.; Gardner, W. Payton; Hunt, Andrew G.
Beisner, K.R., Gardner, W.P., Hunt, A.G., (2018) Geochemical characterization and modeling of regional groundwater contributing to the Verde River, Arizona between Mormon Pocket and the USGS Clarkdale gage, Journal of Hydrology. vol. 564, p. 99-114. https://doi.org/10.1016/j.jhydrol.2018.06.078

Year Published: 2018

Rapid 3-D analysis of rockfalls

Recent fatal and damaging rockfalls in Yosemite National Park indicate the need for rapid response data collection methods to inform public safety and assist with management response. Here we show the use of multiple-platform remote sensing methods to rapidly capture pertinent data needed to inform management and the public following a several...

Stock, Greg M.; Guerin, A.; Avdievitch, Nikita N.; Collins, Brian D.; Jaboyedoff, Michel
Stock, G.M., Guerin, A., Avdievitch, N., Collins, B.D., Jaboyedoff, M., 2018, Rapid 3-D analysis of rockfalls, GSA Today, Groundwork, v. 28, https://doi.org/10.1130/GSATG374GW.1.