D. A. Ponce
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View article: Osteohistología de Archosauriformes triásicos sudamericanos (Reptilia: Eucrocopoda): implicancias paleobiológicas
Osteohistología de Archosauriformes triásicos sudamericanos (Reptilia: Eucrocopoda): implicancias paleobiológicas Open
Los arcosauriformes fueron los reptiles dominantes durante el Mesozoico. En los inicios de esta era, en el Período Triásico, los arcosauriformes radiaron en una gran variedad de formas, siendo Archosauria el grupo predominante. Este está f…
View article: Mafic Alkaline Magmatism and Rare Earth Element Mineralization in the Mojave Desert, California: The Bobcat Hills Connection to Mountain Pass
Mafic Alkaline Magmatism and Rare Earth Element Mineralization in the Mojave Desert, California: The Bobcat Hills Connection to Mountain Pass Open
Occurrences of alkaline and carbonatite rocks with high concentrations of rare earth elements (REE) are a defining feature of Precambrian geology in the Mojave Desert of southeastern California. The most economically important occurrence i…
View article: Augmented Reality to Assess Short-Term Spatial Memory: A Comparative Study of Olfactory, Visual, and Tactile Stimuli
Augmented Reality to Assess Short-Term Spatial Memory: A Comparative Study of Olfactory, Visual, and Tactile Stimuli Open
[EN] This work presents an Augmented Reality application based on SLAM (Simultaneous Localization and Mapping) for the assessment of spatial memory involving olfactory stimuli. A study was carried with twenty-five adults. The participants …
View article: Guayaquil, Ecuador: mapeo del ecosistema de emprendimiento con foco en GovTech
Guayaquil, Ecuador: mapeo del ecosistema de emprendimiento con foco en GovTech Open
Este análisis del ecosistema de emprendimiento innovador en Guayaquil, Ecuador desde la óptica GovTech se realizó con miras a identificar los diversos actores que, por su área de especialización (verticales de trabajo) o su actividad, debe…
View article: Sustainable Composites From Nature to Construction. Hemp and Linseed Reinforced Biocomposites Based on Biobased Epoxy Resins
Sustainable Composites From Nature to Construction. Hemp and Linseed Reinforced Biocomposites Based on Biobased Epoxy Resins Open
The present manuscript describes the use of natural fibers as natural and sustainable reinforcement agents for advanced biobased composite materials for strategic sectors, such as construction. The characterization carried up have shown th…
View article: Focus areas for data acquisition for potential domestic resources of 13 critical minerals in the conterminous United States and Puerto Rico — Antimony, barite, beryllium, chromium, fluorspar, hafnium, helium, magnesium, manganese, potash, uranium, vanadium, and zirconium
Focus areas for data acquisition for potential domestic resources of 13 critical minerals in the conterminous United States and Puerto Rico — Antimony, barite, beryllium, chromium, fluorspar, hafnium, helium, magnesium, manganese, potash, uranium, vanadium, and zirconium Open
First posted July 14, 2022 For additional information, contact: Mineral Resources Program CoordinatorMineral Resources ProgramU.S. Geological Survey913 National CenterReston, VA 20192 The Earth Mapping Resources Initiative (Earth MRI) is c…
View article: Three‐Dimensional Electrical Resistivity Characterization of Mountain Pass, California and Surrounding Region
Three‐Dimensional Electrical Resistivity Characterization of Mountain Pass, California and Surrounding Region Open
The Sulphide Queen carbonatite deposit at Mountain Pass in southeast California is a world class rare earth element (REE) resource. This study images electrical resistivity structure of the REE deposit and surrounding area to characterize …
View article: Dynamic Rupture Scenarios of Large Earthquakes on the Rodgers Creek-Hayward-Calaveras-Northern Calaveras Fault System, California
Dynamic Rupture Scenarios of Large Earthquakes on the Rodgers Creek-Hayward-Calaveras-Northern Calaveras Fault System, California Open
<p>The Rodgers Creek-Hayward-Calaveras-Northern Calaveras fault system in California dominates the hazard posed by active faults in the San Francisco Bay Area. Given that this fault system runs through a densely populated area, a lar…
View article: A Geology and Geodesy Based Model of Dynamic Earthquake Rupture on the Rodgers Creek‐Hayward‐Calaveras Fault System, California
A Geology and Geodesy Based Model of Dynamic Earthquake Rupture on the Rodgers Creek‐Hayward‐Calaveras Fault System, California Open
The Hayward fault in California's San Francisco Bay area produces large earthquakes, with the last occurring in 1868. We examine how physics‐based dynamic rupture modeling can be used to numerically simulate large earthquakes on not only t…
View article: Supplemental Material: Geophysical characterization of a Proterozoic REE terrane at Mountain Pass, eastern Mojave Desert, California, USA
Supplemental Material: Geophysical characterization of a Proterozoic REE terrane at Mountain Pass, eastern Mojave Desert, California, USA Open
Geosphere, February 2020, v. 16, no. 1, 456-471, doi:10.1130/GES02066.1, Supplemental Material. Information related to twodimensional (2-D) modeling of magnetotelluric (MT) data, including: strike analysis, modeling parameters, and model f…
View article: Focus areas for data acquisition for potential domestic resources of 11 critical minerals in the conterminous United States, Hawaii, and Puerto Rico—Aluminum, cobalt, graphite, lithium, niobium, platinum-group elements, rare earth elements, tantalum, tin, titanium, and tungsten
Focus areas for data acquisition for potential domestic resources of 11 critical minerals in the conterminous United States, Hawaii, and Puerto Rico—Aluminum, cobalt, graphite, lithium, niobium, platinum-group elements, rare earth elements, tantalum, tin, titanium, and tungsten Open
First posted September 18, 2020 For additional information, contact: Coordinator, Mineral Resources ProgramU.S. Geological Survey913 National CenterReston, VA 20192 In response to a need for information on potential domestic sources of cri…
View article: Geophysical characterization of a Proterozoic REE terrane at Mountain Pass, eastern Mojave Desert, California, USA
Geophysical characterization of a Proterozoic REE terrane at Mountain Pass, eastern Mojave Desert, California, USA Open
Mountain Pass, California (USA), located in the eastern Mojave Desert, hosts one of the world’s richest rare earth element (REE) deposits. The REE-rich terrane occurs in a 2.5-km-wide, northwest-trending belt of Mesoproterozoic (1.4 Ga) st…
View article: Airborne radiometric maps of Mountain Pass, California
Airborne radiometric maps of Mountain Pass, California Open
First posted August 20, 2019 For additional information, contact: Director,Geology, Minerals, Energy, & Geophysics Science CenterMenlo Park, CaliforniaU.S. Geological Survey345 Middlefield RoadMenlo Park, CA 94025-3591 Geophysical investig…
View article: Analysis of La Dehesa paleo-landslide. Central Pre-Andes of Argentina
Analysis of La Dehesa paleo-landslide. Central Pre-Andes of Argentina Open
View article: Isostatic gravity map of Mountain Pass and vicinity, California and Nevada
Isostatic gravity map of Mountain Pass and vicinity, California and Nevada Open
First posted October 11, 2018 For additional information, contact: Director,Geology, Minerals, Energy, & Geophysics Science CenterMenlo Park, CaliforniaU.S. Geological Survey345 Middlefield RoadMenlo Park, CA 94025-3591 Gravity investigati…
View article: Aeromagnetic map of Mountain Pass and vicinity, California and Nevada
Aeromagnetic map of Mountain Pass and vicinity, California and Nevada Open
First posted October 11, 2018 For additional information, contact: Director,Geology, Minerals, Energy, & Geophysics Science CenterMenlo Park, CaliforniaU.S. Geological Survey345 Middlefield RoadMenlo Park, CA 94025-3591 Magnetic investigat…
View article: 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 and the role of the Silver Creek fault in the San Andreas fault system, San Francisco Bay region, California Open
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 …
View article: Depth to pre-Cenozoic bedrock in northern Nevada
Depth to pre-Cenozoic bedrock in northern Nevada Open
This digital raster dataset represents depth to pre-Cenozoic bedrock in northern Nevada as published in Chapter 6: Geophysical Methods and Application in U.S. Geological Survey Bulletin 2218, Assessment of Metallic and Mineral Resources in…
View article: Magnetotelluric Imaging of a Carbonatite Terrane in the Southeast Mojave Desert, California and Nevada
Magnetotelluric Imaging of a Carbonatite Terrane in the Southeast Mojave Desert, California and Nevada Open
The southeast Mojave Desert hosts one of the world's largest rare earth element (REE) deposits at Mountain Pass, California. Although surface geology has been studied, a full understanding of the carbonatite and associated intrusive suite …
View article: Missing link between the Hayward and Rodgers Creek faults
Missing link between the Hayward and Rodgers Creek faults Open
A direct link between the Hayward and Rodgers Creek faults would enable simultaneous rupture.
View article: Gravity and magnetic studies of the eastern Mojave Desert, California and Nevada
Gravity and magnetic studies of the eastern Mojave Desert, California and Nevada Open
First posted June 17, 2016 Revised August 20, 2018 For additional information, contact: Contact Information, Geology, Minerals, Energy, & Geophysics Science Center—Tucson U.S. Geological Survey, c/o University of Arizona ENRB Bldg, 520 N. …
View article: Marine magnetic survey and onshore gravity and magnetic survey, San Pablo Bay, northern California
Marine magnetic survey and onshore gravity and magnetic survey, San Pablo Bay, northern California Open
First posted September 12, 2016 For additional information, contact: Contact Information, Geology, Minerals, Energy, & Geophysics Science Center—Menlo Park, California U.S. Geological Survey 345 Middlefield Road Menlo Park, CA 94025-3591 h…
View article: Imaging the magmatic system of Mono Basin, California, with magnetotellurics in three dimensions
Imaging the magmatic system of Mono Basin, California, with magnetotellurics in three dimensions Open
A three‐dimensional (3‐D) electrical resistivity model of Mono Basin in eastern California, unveils a complex subsurface filled with zones of partial melt, fluid‐filled fracture networks, cold plutons, and regional faults. In 2013, 62 broa…
View article: A summary of the late Cenozoic stratigraphic and tectonic history of the Santa Clara Valley, California
A summary of the late Cenozoic stratigraphic and tectonic history of the Santa Clara Valley, California Open
The late Cenozoic stratigraphic and tectonic history of the Santa Clara Valley illustrates the dynamic nature of the North American–Pacific plate boundary and its effect on basin and landscape development. Prior to early Miocene time, the …
View article: Structural superposition in fault systems bounding Santa Clara Valley, California
Structural superposition in fault systems bounding Santa Clara Valley, California Open
Santa Clara Valley is bounded on the southwest and northeast by active strike-slip and reverse-oblique faults of the San Andreas fault system. On both sides of the valley, these faults are superposed on older normal and/or right-lateral no…