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Historical methyl mercury in San Francisco Bay San Francisco Bay, California is considered a mercury-impaired watershed. Elevated concentrations of mercury are found in water and sediment as well as fish and estuarine birds. Sources of mercury to the watershed since 1845 include sediment-associated mercury from mercury mining, mercury losses from gold amalgamation activities in mines of the Sierra Nevada, aerial deposition of mercury from global and regional emissions to air, and the direct discharge of mercury to Bay waters associated with the urbanization and industrialization of the estuary. We assessed historical trends in mercury bioaccumulation by measuring mercury concentrations in feathers of the endangered California Ridgway’s rail (formerly California... Categories: Data; Tags: California Ridgway's Rail, Feathers, Ice Cores, Lake Tahoe, Mercury, All tags... San Francisco Bay, Sediment, Structural Equation Model, USGS Science Data Catalog (SDC), Wyoming, Fewer tags Aeromagnetic Data of Portola, California, and Surrounding Areas This data release provides access to an aeromagnetic survey over a part of northern California, an area that includes the cities of Portola, California, and Reno, Nevada. The survey extends across the northern part of the Sierra Nevada from Honey Lake in the north to Lake Tahoe in the south and over parts of the Sierra Nevada foothills. These data were acquired between March 3 and May 3, 2021, by EDCON-PRJ, Inc., working under contract to the U.S. Geological Survey. The nominal flying height was based on a best fit, pre-planned, three-dimensional draped surface targeted at 305 m above terrain, subject to aircraft climb and descent limitations. Steep terrain in parts of the survey area required significant departures... Categories: Data; Tags: Geophysics, Lake Almanor, Lake Tahoe, Portola, Quincy, All tags... Reno, USGS Science Data Catalog (SDC), aeromagnetic surveying, crust (earth), earthquakes, geoscientificInformation, magnetic anomaly, magnetic field (earth), magnetometer measurement, neotectonic processes, Fewer tags Gravity, density, and magnetic property measurements of the Sierra Nevada, California and Nevada This data release presents point data associated with the geologic and geophysical maps of the Sierra Nevada Digital Earth Science Atlas led by the California Geological Survey and U.S. Geological Survey. Data include principal fact information for new gravity measurements collected by the U.S. Geological Survey from 2012 to 2023 and for existing gravity measurements compiled from 21 sources. Nearly 29,000 gravity measurements were processed to complete Bouguer and isostatic gravity anomalies to provide information on crustal structure, such as depth extent of plutons and arc terranes, and geometry of Cenozoic basins developed along the margins of the Sierra Nevada. Density and magnetic property measurements were... Categories: Data; Tags: Eldorado National Forest, Lake Almanor, Lake Isabella, Lake Tahoe, Mono Lake, All tags... Plumas National Forest, Sequoia National Park, Sierra National Forest, Sierra Nevada, Stanislaus National Forest, Tahoe National Forest, Tehachapi Mountains, USGS Science Data Catalog (SDC), Yosemite National Park, density measurement, geoscientificInformation, gravity measurement, natural remanent magnetization, none, rock magnetic susceptibility, Fewer tags