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Filter Total Items: 557
Year Published: 2016

Geologic map of the Morena Reservoir 7.5-minute quadrangle, San Diego County, California

IntroductionMapping in the Morena Reservoir 7.5-minute quadrangle began in 1980, when the Hauser Wilderness Area, which straddles the Morena Reservoir and Barrett Lake quadrangles, was mapped for the U.S. Forest Service. Mapping was completed in 1993–1994. The Morena Reservoir quadrangle contains part of a regional-scale Late Jurassic(?) to Early...

Todd, Victoria R.
Todd, V.R., 2016, Geologic map of the Morena Reservoir 7.5-minute quadrangle, San Diego County, California: U.S. Geological Survey Open-File Report 95–50, 12 p., scale 1:24,000, http://dx.doi.org/10.3133/ofr9550.

Year Published: 2016

Natural thorium resources and recovery: Options and impacts

This paper reviews the front end of the thorium fuel cycle, including the extent and variety of thorium deposits, the potential sources of thorium production, and the physical and chemical technologies required to isolate and purify thorium. Thorium is frequently found within rare earth element–bearing minerals that exist in diverse types of...

Ault, Timothy; Van Gosen, Bradley S.; Krahn, Steven; Croff, Allen

Year Published: 2016

Reevaluation of the Crooked Ridge River- Early Pleistocene (ca. 2 Ma) age and origin of the White Mesa Alluvium, northeastern Arizona

Essential features of the previously named and described Miocene Crooked Ridge River in northeastern Arizona (USA) are reexamined using new geologic and geochronologic data. Previously it was proposed that Cenozoic alluvium at Crooked Ridge and southern White Mesa was pre–early Miocene, the product of a large, vigorous late Paleogene river...

Hereford, Richard; Beard, Sue; Dickinson, William R.; Karlstrom, Karl E.; Heizler, Matthew T.; Crossey, Laura J.; Amoroso, Lee; House, Kyle; Pecha, Mark
Hereford, R. Beard, L.S., Dickinson, W.R., Karlstrom, K.E., Heizler, M.T., Crossey, L.J., Amoroso, L., House, P.K., and Pecha, M., 2016, Reevaluation of the Crooked Ridge River--Early Pleistocene (ca. 2 Ma) age and origin of the White Mesa alluvium, northeastern Arizona: Geosphere, v. 12, no. 3, p. 1-22, https://doi.org/10.1130/GES01124.1.

Year Published: 2016

Seasonal changes in atmospheric noise levels and the annual variation in pigeon homing performance

Repeated releases of experienced homing pigeons from single sites were conducted between 1972 and 1974 near Cornell University in upstate New York and between 1982 and 1983 near the University of Pittsburgh in western Pennsylvania, USA. No annual variation in homing performance was observed at these sites in eastern North America, in contrast to...

Hagstrum, Jonathan T.; McIsaac, Hugh P.; Drob, Douglas P.
Hagstrum, J.T., McIsaac, H.P. and Drob, D.P., 2016, Seasonal changes in atmospheric noise levels and the annual variation in pigeon homing performance: Journal of Comparative Physiology A, v. 202, p. 413-424, doi:10.1007/s00359-016-1087-y.

Year Published: 2016

The F'derik-Zouerate iron district: Mesoarchean and Paleoproterozoic iron formation of the Tiris Complex, Islamic Republic of Mauritania

High-grade hematitic iron ores (of HIF, containing 60-65 wt%Fe) have been mined in Mauritania since 1952 from Superior-type iron deposits of the F'derik-Zouerate district.  Depletion of the high-grade ores in recent years has resulted in new exploration projects focused on lower-grade magnetite ores occurring in Algoma-type banded iron...

Bouabdellah, Mohammed; Slack, John F.; Taylor, Cliff D.; Finn, Carol A.; Anderson, Eric D.; Bradley, Dwight C.; Joud, Mohamed; Taleb Mohamed, Ahmed; Horton, John D.; Johnson, Craig A.

Year Published: 2016

Geologic history of the Blackbird Co-Cu district in the Lemhi subbasin of the Belt-Purcell Basin

The Blackbird cobalt-copper (Co-Cu) district in the Salmon River Mountains of east-central Idaho occupies the central part of the Idaho cobalt belt—a northwest-elongate, 55-km-long belt of Co-Cu occurrences, hosted in grayish siliciclastic metasedimentary strata of the Lemhi subbasin (of the Mesoproterozoic Belt-Purcell Basin). The Blackbird...

Bookstrom, Arthur A.; Box, Stephen E.; Cossette, Pamela M.; Frost, Thomas P.; Gillerman, Virginia; King, George; Zirakparvar, N. Alex

Year Published: 2016

Geology of the Greenwater Range, and the dawn of Death Valley, California—Field guide for the Death Valley Natural History Conference, 2013

Much has been written about the age and formation of Death Valley, but that is one—if not the last—chapter in the fascinating geologic history of this area. Igneous and sedimentary rocks in the Greenwater Range, one mountain range east of Death Valley, tell an earlier story that overlaps with the formation of Death Valley proper. This...

Calzia, J.P.; Rämö, O.T.; Jachens, Robert; Smith, Eugene; Knott, Jeffrey
Calzia, J.P., Rämö, O.T., Jachens, Robert, Smith, Eugene, and Knott, Jeffrey, 2016, Geology of the Greenwater Range, and the dawn of Death Valley, California—Field guide for the Death Valley Natural History Conference, 2013: U.S. Geological Survey Open-File Report 2016–1064, 32 p., http://dx.doi.org/10.3133/ofr20161064.

Year Published: 2016

Geologic and geochemical insights into the formation of the Taiyangshan porphyry copper–molybdenum deposit, Western Qinling Orogenic Belt, China

Taiyangshan is a poorly studied copper–molybdenum deposit located in the Triassic Western Qinling collisional belt of northwest China. The intrusions exposed in the vicinity of the Taiyangshan deposit record episodic magmatism over 20–30 million years. Pre-mineralization quartz diorite porphyries, which host some of the...

Kun-Feng Qiu; Taylor, Ryan D.; Yao-Hui Song; Hao-Cheng Yu; Kai-Rui Song; Nan Li

Year Published: 2016

Magnetotelluric investigation of the Vestfold Hills and Rauer Group, East Antarctica

The Vestfold Hills and Rauer Group in East Antarctica have contrasting Archean to Neoproterozoic geological histories and are believed to be juxtaposed along a suture zone that now lies beneath the Sørsdal Glacier. Exact location and age of this suture zone are unknown, as is its relationship to regional deformation associated with the...

Peacock, Jared R.; Selway, Katherine
Selway, K., and J. R. Peacock (2016), Magnetotelluric investigation of the Vestfold Hills and Rauer Group, East Antarctica, J. Geophys. Res. Solid Earth, 121, doi:10.1002/2015JB012677.

Year Published: 2016

The Chahnaly low sulfidation epithermal gold deposit, western Makran volcanic arc, southeastern Iran

The Chahnaly low-sulfidation epithermal Au deposit and nearby Au prospects are located northwest of the intermittently active Bazman stratovolcano on the western end of the Makran volcanic arc, which formed as the result of subduction of the remnant Neo-Tethyan oceanic crust beneath the Lut block. The arc hosts the Siah Jangal epithermal and...

Sholeh, Ali; Rastad, Ebrahim; Huston, David L.; Gemmell, J. Bruce; Taylor, Ryan D.
Sholeh, A., Rastad, E., Huston, D., Gemmell, J.B., and Taylor, R.D., 2016, The Chahnaly low sulfidation epithermal gold deposit, western Makran volcanic arc, southeastern Iran: Economic Geology, v. 111, p. 619-639

Year Published: 2016

User’s guide for GcClust—An R package for clustering of regional geochemical data

GcClust is a software package developed by the U.S. Geological Survey for statistical clustering of regional geochemical data, and similar data such as regional mineralogical data. Functions within the software package are written in the R statistical programming language. These functions, their documentation, and a copy of the user’s guide are...

Ellefsen, Karl J.; Smith, David B.
Ellefsen, K.J, and Smith, D.B., 2016, User's guide for GcClust—An R package for clustering of regional geochemical data: U.S. Geological Survey report Techniques and Methods 7–C13, 21 p., http://dx.doi.org/10.3133/tm7c13.

Year Published: 2016

Assessment of undiscovered oil and gas resources of the Taoudeni Basin Province, Mali and Mauritania, 2015

Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 160 million barrels of conventional oil, 1,880 billion cubic feet of conventional gas, 602 million barrels of shale oil, and 6,395 billion cubic feet of shale gas in the Taoudeni Basin Province in Mali and...

Brownfield, Michael E.; Schenk, Christopher J.; Klett, Timothy R.; Tennyson, Marilyn E.; Pitman, Janet K.; Gaswirth, Stephanie B.; Le, Phuong A.; Leathers-Miller, Heidi M.; Mercier, Tracey J.; Marra, Kristen R.; Hawkins, Sarah J.
Brownfield, M.E., Schenk, C.J., Klett, T.R., Tennyson, M.E., Pitman, J.K., Gaswirth, S.B., Le, P.A., Leathers-Miller, H.M., Mercier, T.J., Marra, K.R., and Hawkins, S.J., 2016, Assessment of undiscovered oil and gas resources of the Taoudeni Basin Province, Mali and Mauritania, 2015: U.S. Geological Survey Fact Sheet 2016-3003, 2 p., http://dx.doi.org/10.3133/fs20163003.

Filter Total Items: 82
Image shows a USGS scientist leaning against a rock outcropping with trees in the background
2015 (approx.)
Geologist and cataclastic shear zones in the Melozitna granite in the Ruby batholith. This granite contains abundant monazite and high levels of thorium and rare earth elements. The shear zones accelerate erosion of the granite into streams, where the monazite that contains the rare earth elements can be concentrated. This area is part of the Bureau of Land Management's Central Yukon Planning...
Image shows a woman sitting on a rock in a stream
2015 (approx.)
A USGS geologist pans for monazite and rare earth minerals in Wolf Creek, which cuts through the Melozitna granite. This area is part of the Bureau of Land Management's Central Yukon Planning Area, which USGS did a mineral assessment of in 2015.
Image shows sand in a hand
2015 (approx.)
Frac sands used in unconventional oil and gas development.
October 21, 2015
Elliott Barnhart, a hydrologist with the USGS Wyoming-Montana Water Science Center, describes his work developing what could be a cleaner way to develop coal.
Image shows USGS scientists standing beside a drill rig in protective gear.
September 16, 2015
USGS scientists drilling a research core near Waco, Texas. This core was drilled by USGS during field work for an oil and gas assessment for the Eagle Ford of the Gulf Coast Basins. Cores like these provide information on the various rock layers, such as their make-up, their age, etc. The USGS assesses undiscovered, technically recoverable oil and gas resources for the onshore United States and...
Image shows USGS scientists standing beside a drill rig in protective gear.
September 16, 2015
USGS scientists drilling a research core near Waco, Texas. This core was drilled by USGS during field work for an oil and gas assessment for the Eagle Ford of the Gulf Coast Basins. Cores like these provide information on the various rock layers, such as their make-up, their age, etc. The USGS assesses undiscovered, technically recoverable oil and gas resources for the onshore United States and...
A vehicle is shown at night, with its trunk open and floodlights on
September 16, 2015
USGS scientists drilling a research core near Waco, Texas. This core was drilled by USGS during field work for an oil and gas assessment for the Eagle Ford of the Gulf Coast Basins. Cores like these provide information on the various rock layers, such as their make-up, their age, etc. The USGS assesses undiscovered, technically recoverable oil and gas resources for the onshore United States and...
Image shows USGS scientists standing beside a drill rig in protective gear.
September 16, 2015
USGS scientists drilling a research core near Waco, Texas. This core was drilled by USGS during field work for an oil and gas assessment for the Eagle Ford of the Gulf Coast Basins. Cores like these provide information on the various rock layers, such as their make-up, their age, etc. The USGS assesses undiscovered, technically recoverable oil and gas resources for the onshore United States and...
Image shows USGS scientists standing beside a drill rig in protective gear.
September 16, 2015
USGS scientists drilling a research core near Waco, Texas. This core was drilled by USGS during field work for an oil and gas assessment for the Eagle Ford of the Gulf Coast Basins. Cores like these provide information on the various rock layers, such as their make-up, their age, etc. The USGS assesses undiscovered, technically recoverable oil and gas resources for the onshore United States and...
Image shows USGS scientists standing beside a drill rig in protective gear.
September 16, 2015
USGS scientists drilling a research core near Waco, Texas. This core was drilled by USGS during field work for an oil and gas assessment for the Eagle Ford of the Gulf Coast Basins. Cores like these provide information on the various rock layers, such as their make-up, their age, etc. The USGS assesses undiscovered, technically recoverable oil and gas resources for the onshore United States and...
Image shows USGS scientists standing beside a drill rig in protective gear.
September 14, 2015
USGS scientists drilling a research core near Waco, Texas. This core was drilled by USGS during field work for an oil and gas assessment for the Eagle Ford of the Gulf Coast Basins. Cores like these provide information on the various rock layers, such as their make-up, their age, etc. The USGS assesses undiscovered, technically recoverable oil and gas resources for the onshore United States and...
Filter Total Items: 103
Scientists preparing sediment quality sampling supplies for deployment in advance of Hurricane Joaquin.
December 18, 2015

Medical Geology is an earth science specialty that concerns how geologic materials and earth processes affect human health. 

A map showing the Barnett Shale assessment area in east Texas
December 17, 2015

The Barnett Shale contains estimated mean volumes of 53 trillion cubic feet of shale natural gas, 172 million barrels of shale oil and 176 million barrels of natural gas liquids, according to an updated assessment by the U.S. Geological Survey. This estimate is for undiscovered, technically recoverable resources.

USGS science for a changing world logo
December 17, 2015

Key nonfuel mineral commodities that support the U.S. economy and national security are increasingly being sourced from outside the U.S., according to a new U.S. Geological Survey publication.

Figure showing the top three ranked areas.
December 14, 2015

A new approach to ranking copper resources could result in identifying future supplies of copper while saving both time and money, according to the U.S. Geological Survey.

Graph: Annual mine production of tantalum contained in mined concentrates
December 10, 2015

Reston, VA— The United States is completely reliant on imports of tantalum, which is a commonly used element in electronics, to meet its domestic consumption for economic and national security needs. A new U.S. Geological Survey report illustrates the dramatic change of the international sources of primary mined tantalum over the past 15 years.

Map: Area of Uranium Assessment in Texas
December 2, 2015

The uranium oxide is located in sandstone formations throughout the South Texas Coastal Plain, which borders the Gulf of Mexico. The area has long been known to contain uranium, and two mines are currently in operation, with a number of companies actively exploring for uranium.

Map of Undiscovered Cooper Estimate in the Middle East
November 18, 2015

More than 180 million metric tons of undiscovered copper resources may be found in an area of the Middle East that covers Turkey, Georgia, Armenia, Azerbaijan, Iran, western Pakistan and southwestern Afghanistan, according to a recent assessment by the U.S. Geological Survey.

USGS science for a changing world logo
November 3, 2015

On average, streams in the Niobrara-Mowry Play of eastern Wyoming, Fayetteville Play of Arkansas, and Barnett Play of Texas ranked most vulnerable to unconventional oil and gas development, but for different reasons, according to recent U.S. Geological Survey coauthored research.

USGS science for a changing world logo
October 14, 2015

Many grassland bird species in the Bakken shale region, including some seriously declining populations, are displaced from their habitats as a result of oil and gas development, according to new U.S. Geological Survey research.

Aerial view of the Grabens, Canyonlands National Park
October 12, 2015

A graben is a piece of Earth’s crust that is shifted downward in comparison to adjacent crust known as “horsts,” which are shifted upward.

Map of San Joaquin Basin Province
October 6, 2015

The Monterey Formation in the deepest parts of California’s San Joaquin Basin contains an estimated mean volumes of 21 million barrels of oil, 27 billion cubic feet of gas, and 1 million barrels of natural gas liquids, according to the first USGS assessment of continuous (unconventional), technically recoverable resources in the Monterey Formation.

An image of calcite.
September 21, 2015

The process in which magnesium is removed from the mineral dolomite (calcium magnesium carbonate) leaving behind the minerals calcite (calcium carbonate) and periclase (magnesium oxide.)