Isostatic gravity map of Mountain Pass and vicinity, California and Nevada
David A. Ponce, Kevin M. Denton
David A. Ponce, editor(s)
2018, Scientific Investigations Map 3412-A
Gravity investigations of Mountain Pass and vicinity were begun as part of an effort to study regional crustal structures as an aid to understanding the geologic framework and mineral resources of the eastern Mojave Desert. The study area, which straddles the state boundary between southeastern California and southern Nevada, encompasses...
Geophysical and geologic maps of Mountain Pass and vicinity, California and Nevada
David A. Ponce, editor(s)
2018, Scientific Investigations Map 3412
U.S. Geological Survey Scientific Investigations Map 3412 is a series of products that consists of geophysical and geologic maps of Mountain Pass and vicinity, California. Maps A and B (red outline in above map image) are gravity and aeromagnetic maps, respectively. The map series was begun as part of an...
Barred owl research needs and prioritization in California
Zach Peery, David Wiens, Robin Bown, Peter C. Carlson, Katie Dugger, Jack Dumbacher, Alan B. Franklin, Keith A. Hamm, Mark Higley, John J. Keane
2018, Report
Barred owls (Strix varia) have reached high densities within the range of the northern spotted owl (S. occidentalis caurina) and are rapidly increasing in number within the range of the California spotted owl (S. o. occidentalis). Encroaching populations of barred owls pose a significant competitive threat to the viability of...
Material balance approach for determining oil saturation at the start of carbon dioxide enhanced oil recovery
Mahendra K. Verma
2018, Open-File Report 2018-1146
Oil producers have been using enhanced oil recovery methods, including (1) thermal recovery for heavy oil and (2) carbon dioxide enhanced oil recovery (CO2-EOR) for medium or light oil, to maximize oil recovery from existing reservoirs. The CO2-EOR method is widely used for recovering additional oil after waterflood, which leaves...
Modeling resource selection of bobcats (Lynx rufus) and vertebrate species distributions in Orange County, southern California
Erin E. Boydston, Jeff A. Tracey
2018, Open-File Report 2018-1095
For nature reserves in urban settings, wildlife and wildlife habitats may be affected by recreational activities and intensive, adjacent development. Sustaining biodiversity in such reserves is a challenge for land and natural resource managers, but identification of core areas and key resources for wildlife species may help in planning...
Spatial decision‐support tools to guide restoration and seed‐sourcing in the Desert Southwest
Daniel F. Shryock, Lesley A. DeFalco, Todd Esque
2018, Ecosphere (9) 1-19
Altered disturbance regimes and shifting climates have increased the need for large‐scale restoration treatments across the western United States. Seed‐sourcing remains a considerable challenge for revegetation efforts, particularly on public lands where policy favors the use of native, locally sourced plant material to avoid maladaptation. An important area of emphasis...
A decade of remotely sensed observations highlight complex processes linked to coastal permafrost bluff erosion in the Arctic
Benjamin M. Jones, Louise M. Farquharson, Carson Baughman, Richard M. Buzard, Christopher D. Arp, Guido Grosse, Diana L. Bull, Frank Gunther, Ingmar Nitze, Frank Urban, Jeremy L. Kasper, Jennifer M. Frederick, Matthew A. Thomas, Craig Jones, Alejandro Mota, Scott Dallimore, Craig E. Tweedie, Christopher V. Maio, Daniel H. Mann, Bruce M. Richmond, Ann E. Gibbs, Ming Xiao, Torsten Sachs, Go Iwahana, Mikhail Z. Kanevskiy, Vladimir E. Romanovsky
2018, Environmental Research Letters (13)
Eroding permafrost coasts are indicators and integrators of changes in the Arctic System as they are susceptible to the combined effects of declining sea ice extent, increases in open water duration, more frequent and impactful storms, sea-level rise, and warming permafrost. However, few observation sites in the Arctic have yet...
California Gull population growth and ecological impacts in the San Francisco Bay estuary, 1980–2016
Catherine E. Burns, Joshua T. Ackerman, Natalie B. Washburn, Jill Bluso-Demers, Caitlin Robinson-Nilsen, Cheryl Strong
2018, Book chapter, Trends and traditions: Avifaunal change in western North America, Studies of Western Birds No. 3
The breeding population of California Gulls (Larus californicus) in the San Francisco Bay estuary increased from 24 individuals in 1980 to a peak of over 53,000 in 2014, then declined to 38,040 in 2016. The expansion of the breeding population may be related to the availability of suitable nesting sites in close proximity...
Completion summary for borehole TAN-2312 at Test Area North, Idaho National Laboratory, Idaho
Brian V. Twining, Roy C. Bartholomay, Mary K. V. Hodges
2018, Scientific Investigations Report 2018-5118
In 2017, the U.S. Geological Survey, in cooperation with the U.S. Department of Energy, drilled and constructed borehole TAN-2312 for stratigraphic framework analyses and long-term groundwater monitoring of the eastern Snake River Plain aquifer at the Idaho National Laboratory in southeast Idaho. The location of borehole TAN-2312 was selected because...
Nearshore single-beam bathymetry data collected in 2015, Dauphin Island, Alabama
Nancy T. DeWitt, Chelsea A. Stalk, James G. Flocks, Julie Bernier, Kyle W. Kelso, Jake J. Fredericks, Thomas M. Tuten
2018, Data Series 1095
Dauphin Island, Alabama, is a barrier island located in the northern Gulf of Mexico that supports local residences, tourism, commercial infrastructure, and historic Fort Gaines. During the past decade, Dauphin Island was affected by several major hurricanes—Hurricanes Ivan (2004), Katrina (2005), and Isaac (2012)—and storms, along with sea-level rise, continue...
Topics in coal geochemistry—Short course
Allan Kolker
2018, Open-File Report 2018-1145
This short course was prepared at the request of Servicio Geológico Colombiano (SGC) as a module for staff training. Prior to the short course, the SGC expressed interest in receiving training in (1) geochemistry and quality of coal; (2) geochemistry of trace elements in coal; (3) mercury and halogens in...
Efficacy of a passive use-estimation system for estimating fishing effort on a multi-lake fishery
Hunter J. Roop, Neelam C. Poudyal, Cecil A. Jennings
2018, Fisheries Management and Ecology (25) 512-514
No abstract available....
Geologic framework and hydrostratigraphy of the Edwards and Trinity aquifers within Hays County, Texas
Allan K. Clark, Diana E. Pedraza, Robert R. Morris
2018, Scientific Investigations Map 3418
The Edwards and Trinity aquifers are classified as major aquifers by the Texas Water Development Board and are major sources of water in south-central Texas, where Hays County is located. Detailed maps and descriptions of the geologic framework and hydrostratigraphic units (HSUs) of these karstic aquifers in Hays County are...
Distribution of mining-related trace elements in streambed and flood-plain sediment along the middle Big River and tributaries in the Southeast Missouri Barite District, 2012–15
David C. Smith, John G. Schumacher
2018, Scientific Investigations Report 2018-5103
Lead mining first began in the Big River watershed during the 1700s. Lead was the primary metal mined throughout most of the 1700s and early 1800s and it continued to be mined until the mid-1900s. Barite mining began in the middle part of the watershed in the mid- to late...
The Central African Republic Diamond Database—A geodatabase of archival diamond occurrences and areas of recent artisanal and small-scale diamond mining
Jessica D. DeWitt, Peter G. Chirico, Sarah E. Bergstresser, Inga E. Clark
2018, Open-File Report 2018-1088
The alluvial diamond deposits of the Central African Republic (CAR) are mined almost exclusively by way of informal artisanal and small-scale mining (ASM) methods. ASM sites range in diameter from a few meters to 30 meters or more, and are typically excavated by crews of diggers using hand tools, sieves,...
The significance of dinoflagellates in the Miocene Choptank Formation beneath the Midlothian gravels in the southeastern Virginia Piedmont
Lucy E. Edwards, Robert E. Weems, Mark W. Carter, David Spears, David S. Powars
2018, Stratigraphy (15) 179-195
The Fall Line (formally "Tidewater Fall Line") separates the more resistant igneous, metamorphic, and consolidated sedimentary rocks of the Piedmont from the typically unconsolidated deposits of the Coastal Plain of Virginia. Widespread but now discontinuous patches of a deeply weathered sand and gravel are found west of the Fall Line,...
An underwater observation dataset for fish classification and fishery assessment
Erin L. McCann, Liling Li, Kevin Pangle, Nicholas S. Johnson, Jesse Eickholt
2018, Scientific Data (5) 1-8
Using Dual-Frequency Identification Sonar (DIDSON), fishery acoustic observation data was collected from the Ocqueoc River, a tributary of Lake Huron in northern Michigan, USA. Data were collected March through July 2013 and 2016 and included the identification, via technology or expert analysis, of eight fish species as they passed through...
Hydrodynamics of a tidally‐forced coral reef atoll
Rebecca H. Green, Ryan J. Lowe, Mark L. Buckley
2018, Journal of Geophysical Research C: Oceans (123) 7084-7101
The hydrodynamics of a tidally forced semi‐enclosed coral reef atoll (North Scott) at the edge of the continental shelf of northwestern Australia were investigated by combining field observations and numerical modeling. The observations revealed that the spring tidal range outside the atoll reaches 4 m, and as the water level drops...
Improving earthquake rupture forecasts using California as a guide
Edward H. Field, Working Group on California Earthquake Probabilities
2018, Seismological Research Letters (89) 2337-2346
This article discusses ways in which earthquake rupture forecast models might be improved. Because changes are most easily described in the context of specific models, the third Uniform California Earthquake Rupture Forecast (UCERF3) and its presumed successor, UCERF4, is used as a basis for discussion. Virtually all of the issues...
Downhole log evidence for the coexistence of structure II gas hydrate and free gas below the bottom simulating reflector in the South China Sea
Jin Qian, Xiujuan Wang, Timothy S. Collett, Yiqun Guo, Dongju Kang, Jiapeng Jin
2018, Marine and Petroleum Geology (98) 662-674
Stratigraphic layered pore-filling gas hydrates are identified above the bottom simulating reflector (BSR) using the well log and core data acquired at Sites W11 and W17 during the third gas hydrate drilling expedition conducted by China's Geological Survey/Guangzhou Marine Geological Survey (GMGS3) in the South China Sea. A seismic profile near Site W17, reveal the presence...
Igneous and detrital zircon U-Pb and Lu-Hf geochronology of the late Meso- to Neoproterozoic northwest Botswana rift: Maximum depositional age and provenance of the Ghanzi Group, Kalahari Copperbelt, Botswana and Namibia
Wesley S Hall, Murray Hitzman, Yvette D. Kuiper, Andrew R C Kylander-Clark, Christopher S. Holm-Denoma, Richard J. Moscati, Piret Plink-Bjorklund, Stephen M Enders
2018, Precambrian Research (318) 133-155
New igneous and detrital zircon laser ablation-inductively coupled plasma mass spectrometry (LA-ICPMS) U-Pb geochronology and Lu-Hf isotopic data are presented for the Mesoproterozoic Kgwebe Formation and the unconformably overlying Ghanzi Group in northwestern Botswana. The Makgabana Hills porphyritic rhyolite flow from...
Diet and condition of age‐0 Scaphirhynchus Sturgeon: Implications for shallow‐water habitat restoration
A. P. Civiello, N. J. C. Gosch, T. R. Gemeinhardt, M. L. Miller, J. L. Bonneau, Kimberly Chojnacki, Aaron J. DeLonay, James M. Long
2018, North American Journal of Fisheries Management (38) 1324-1338
Insufficient food during early life could limit the population growth of endangered Pallid Sturgeon Scaphirhynchus albus in the lower Missouri River. Shallow‐water habitat restoration is intended to provide nursery benefits, including food, for young sturgeon, but the effect of shallow‐water habitat on their diet is unknown. Age‐0 Pallid Sturgeon are rare, providing...
Mount St. Helens retrospective: Lessons learned since 1980 and remaining challenges
Daniel Dzurisin
2018, Frontiers in Earth Science (6) 1-24
Since awakening from a 123-year repose in 1980, Mount St. Helens has provided an opportunity to study changes in crustal magma storage at an active arc volcano—a process of fundamental importance to eruption forecasting and hazards mitigation. There has been considerable progress, but important questions remain unanswered. Was the 1980...
Thiamine deficiency in fishes: Causes, consequences, and potential solutions
Avril M. Harder, William R. Ardren, Allison N. Evans, Matthew H. Futia, Clifford E. Kraft, J. Ellen Marsden, Catherine A. Richter, Jacques Rinchard, Donald E. Tillitt, Mark R. Christie
Mark R. Christie, editor(s)
2018, Reviews in Fish Biology and Fisheries (28) 865-886
Thiamine deficiency complex (TDC) is a disorder resulting from the inability to acquire or retain thiamine (vitamin B1) and has been documented in organisms in aquatic ecosystems ranging from the Baltic Sea to the Laurentian Great Lakes. The biological mechanisms leading to TDC emergence may vary among systems, but in...
Improving confidence by embracing uncertainty: A meta-analysis of U.S. hunting values for benefit transfer
Christopher Huber, James R. Meldrum, Leslie Richardson
2018, Ecosystem Services (33) 225-236
Recreational hunting in the United States has traditional and cultural importance, and generates substantial economic benefits to individual hunters themselves. This paper conducts a meta-analysis of existing nonmarket valuation estimates for hunting in the United States to explore sources and implications of variation and uncertainty in these estimates. A multi-level...
