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North Root NWR, Montana, 2017 Shallow subsurface electrical conductivity was mapped at North Root National Wildlife Refuge (NWR) in northeast Montana using the DUALEM421 electromagnetic sensor (Dualem, Inc., ON, Canada) in the winter of 2017. Data were acquired by towing the DUALEM421 sensor on a sled behind an all-terrain vehicle or snow machine, with the sensor at a nominal height of 0.3 meters (m) above ground surface. Approximately 9 line-kilometers (km) of data were acquired over an area of approximately 1 square-kilometer. Data were manually edited to remove sensor dropouts, lag corrected for apparent offsets between recorded GPS location and data locations for each coil pair, and averaged to a sounding distance of 1m along the survey... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: GGGSC, Geology, Geophysics, and Geochemistry Science Center, Montana, NOROCK, National Wildlife Refuge, All tags... North Root, Northern Rocky Mountain Science Center, Prairie Pothole Region, STEPPE, Science Team about Energy and Plains and Potholes Environments, Williston Basin, electromagnetic surveying, electromagnetics, environment, geophysics, geoscientificInformation, groundwater, hydrogeology, resistivity, salinity, water resources, Fewer tags Sound velocity profiles - locations, images, and text files for sound velocity profiles calculated from XBT and CTD casts conducted during USGS field activities 2017-001-FA and 2017-002 FA In spring and summer 2017, the U.S. Geological Survey’s Gas Hydrates Project conducted two cruises aboard the research vessel Hugh R. Sharp to explore the geology, chemistry, ecology, physics, and oceanography of sea-floor methane seeps and water column gas plumes on the northern U.S. Atlantic margin between the Baltimore and Keller Canyons. Split-beam and multibeam echo sounders and a chirp subbottom profiler were deployed during the cruises to map water column backscatter, sea-floor bathymetry and backscatter, and subsurface stratigraphy associated with known and undiscovered sea-floor methane seeps. The first cruise, known as the Interagency Mission for Methane Research on Seafloor Seeps and designated as field... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Accomac Canyon, Atlantic Ocean, CMHRP, Chincoteague Ridge, Coastal and Marine Hazards and Resources Program, All tags... DOE, DOI, Department of Energy, Department of the Interior, IMMeRSS, Interagency Mission for Methane Research on Seafloor Seeps, Keller Canyon, NOAA-OER, Norfolk Canyon, PNG, R/V Hugh R. Sharp, SSP, SVP, Seabird Electronics 911plus CTD, Sippican XBT, U.S. Geological Survey, USGS, United States of America, University of Rochester, WHCMSC, Washington Canyon, Woods Hole Coastal and Marine Science Center, field activity number 2017-001-FA, field activity number 2017-002-FA, geoscientificInformation, location, marine geophysics, navigational data, ocean sciences, oceanography, oceans, shapefile, sound speed profile, sound velocity, sound velocity profile, sound velocity profiles, Fewer tags Beaver Lake NWR, North Dakota, 2018 Shallow subsurface electrical conductivity was mapped at Beaver Lake National Wildlife Refuge (NWR) in northwest North Dakota using the DUALEM421 electromagnetic sensor (Dualem, Inc., ON, Canada) in the winter of 2018. Data were acquired by towing the DUALEM421 sensor on a sled behind an all-terrain vehicle or snow machine, with the sensor at a nominal height of 0.3 meters (m) above ground surface. Approximately 127 line-kilometers (km) of data were acquired over an area of approximately 8 square-kilometers. At this survey location, the 4m transmitter-receiver horizontal co-planar and perpendicular coil orientations did not function due to equipment malfunction. Data were manually edited to remove sensor dropouts,... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Beaver Lake, GGGSC, Geology, Geophysics, and Geochemistry Science Center, NOROCK, National Wildlife Refuge, All tags... North Dakota, Northern Rocky Mountain Science Center, Prairie Pothole Region, STEPPE, Science Team about Energy and Plains and Potholes Environments, Williston Basin, electromagnetic surveying, electromagnetics, environment, geophysics, geoscientificInformation, groundwater, hydrogeology, resistivity, salinity, water resources, Fewer tags Stateline NWR, Montana, 2017 Shallow subsurface electrical conductivity was mapped at Stateline National Wildlife Refuge (NWR) in northeast Montana using the DUALEM421 electromagnetic sensor (Dualem, Inc., ON, Canada) in the winter of 2017. Data were acquired by towing the DUALEM421 sensor on a sled behind an all-terrain vehicle or snow machine, with the sensor at a nominal height of 0.3 meters (m) above ground surface. Approximately 3 line-kilometers (km) of data were acquired over an area of approximately .2 square-kilometers. Data were manually edited to remove sensor dropouts, lag corrected for apparent offsets between recorded GPS location and data locations for each coil pair, and averaged to a sounding distance of 1m along the survey... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: GGGSC, Geology, Geophysics, and Geochemistry Science Center, Montana, NOROCK, National Wildlife Refuge, All tags... Northern Rocky Mountain Science Center, Prairie Pothole Region, STEPPE, Science Team about Energy and Plains and Potholes Environments, Stateline, Williston Basin, electromagnetic surveying, electromagnetics, environment, geophysics, geoscientificInformation, groundwater, hydrogeology, resistivity, salinity, water resources, Fewer tags Airborne electromagnetic, magnetic, and radiometric survey of the Mississippi Alluvial Plain, November 2019 - March 2020 Airborne electromagnetic (AEM), magnetic, and radiometric data were acquired November 2019 to March 2020 along 24,030 line-kilometers (line-km) over the Mississippi Alluvial Plain (MAP). Data were acquired by CGG Canada Services, Ltd. with three different airborne sensors: the CGG Canada Services, Ltd. TEMPEST time-domain AEM instrument that is used to map subsurface geologic structure at depths up to 300 meters (m), depending on the subsurface resistivity; a Scintrex CS-3 cesium vapor magnetometer that detects changes in deep (hundreds of meters to kilometers) geologic structure based on variations in the magnetic properties of different formations; and a Radiation Solutions RS-500 spectrometer that detects the... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Arkansas, Arkansas River, GGGSC, Geology, Geophysics, and Geochemistry Science Center, Geophysics, All tags... Hydrology, Illinois, Louisiana, MRVA, Mississippi, Mississippi Alluvial Plain, Mississippi River, Mississippi River Valley Alluvial aquifer, Missouri, New Madrid Seismic Zone, Shellmound, Tennessee, U.S. Geological Survey, USGS, USGS Science Data Catalog (SDC), WAUSP, Water Availability and Use Science Program, Water Resources, aeromagnetic surveying, aeroradiometric surveying, electromagnetic surveying, electromagnetics, engineering sciences, environment, geologic structure, geophysics, geoscientificInformation, geospatial datasets, groundwater, hydrogeology, hydrology, magnetic field, magnetics, potassium, radiometrics, resistivity, thorium, uranium, water resources, Fewer tags Ultra-short baseline - navigation points and tracklines for Applied Acoustics EasyTrack Nexus 2 USBL data collected for ROV Global Explorer during USGS field activity 2017-001-FA In spring and summer 2017, the U.S. Geological Survey’s Gas Hydrates Project conducted two cruises aboard the research vessel Hugh R. Sharp to explore the geology, chemistry, ecology, physics, and oceanography of sea-floor methane seeps and water column gas plumes on the northern U.S. Atlantic margin between the Baltimore and Keller Canyons. Split-beam and multibeam echo sounders and a chirp subbottom profiler were deployed during the cruises to map water column backscatter, sea-floor bathymetry and backscatter, and subsurface stratigraphy associated with known and undiscovered sea-floor methane seeps. The first cruise, known as the Interagency Mission for Methane Research on Seafloor Seeps and designated as field... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Accomac Canyon, Applied Acoustics, Atlantic Margin, Atlantic Ocean, Baltimore Canyon, All tags... CMGP, Chincoteague Ridge, Coastal and Marine Geology Program, DOE, DOI, Department of Energy, Department of the Interior, EasyTrack Nexus 2, IMMeRSS, Interagency Mission for Methane Research on Seafloor Seeps, Keller Canyon, NOAA-OER, Norfolk Canyon, R/V Hugh R. Sharp, ROV Global Explorer, ROV navigation, U.S. Geological Survey, USBL, USBL navigation, USGS, United States of America, WHCMSC, Washington Canyon, Woods Hole Coastal and Marine Science Center, field activity number 2017-001-FA, geoscientificInformation, geospatial datasets, location, marine geology, marine geology, marine geophysics, navigational data, oceans, shapefile, trackline navigation, Fewer tags Hansen NWR, Montana, 2017 Shallow subsurface electrical conductivity was mapped at Hansen National Wildlife Refuge (NWR) in northeast Montana using the DUALEM421 electromagnetic sensor (Dualem, Inc., ON, Canada) in the winter of 2017. Data were acquired by towing the DUALEM421 sensor on a sled behind an all-terrain vehicle or snow machine, with the sensor at a nominal height of 0.3 meters (m) above ground surface. Approximately 10 line-kilometers (km) of data were acquired over an area of approximately .2 square-kilometers. Data were manually edited to remove sensor dropouts, lag corrected for apparent offsets between recorded GPS location and data locations for each coil pair, and averaged to a sounding distance of 1m along the survey path;... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: GGGSC, Geology, Geophysics, and Geochemistry Science Center, Hansen, Montana, NOROCK, All tags... National Wildlife Refuge, Northern Rocky Mountain Science Center, Prairie Pothole Region, STEPPE, Science Team about Energy and Plains and Potholes Environments, Sheridan County, Williston Basin, electromagnetic surveying, electromagnetics, environment, geophysics, geoscientificInformation, groundwater, hydrogeology, resistivity, salinity, water resources, Fewer tags Gjesdal East NWR, Montana, 2017 Shallow subsurface electrical conductivity was mapped at Gjesdal East National Wildlife Refuge (NWR) in northeast Montana using the DUALEM421 electromagnetic sensor (Dualem, Inc., ON, Canada) in the winter of 2017. Data were acquired by towing the DUALEM421 sensor on a sled behind an all-terrain vehicle or snow machine, with the sensor at a nominal height of 0.3 meters (m) above ground surface. Approximately 13 line-kilometers (km) of data were acquired over an area of approximately .7 square-kilometers. Data were manually edited to remove sensor dropouts, lag corrected for apparent offsets between recorded GPS location and data locations for each coil pair, and averaged to a sounding distance of 1m along the survey... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: GGGSC, Geology, Geophysics, and Geochemistry Science Center, Gjesdal East, Montana, NOROCK, All tags... National Wildlife Refuge, Northern Rocky Mountain Science Center, Prairie Pothole Region, STEPPE, Science Team about Energy and Plains and Potholes Environments, Sheridan County, MT, Williston Basin, electromagnetic surveying, electromagnetics, environment, geophysics, geoscientificInformation, groundwater, hydrogeology, resistivity, salinity, water resources, Fewer tags Airborne electromagnetic, magnetic, and radiometric survey, upper East River and surrounding watersheds near Crested Butte, Colorado, 2017 This data release consists of 1,984 line-kilometers of airborne electromagnetic (AEM), magnetic data and radiometric data collected from October to November 2017 in the upper East River and surrounding watersheds in central Colorado. The U.S. Geological Survey contracted Geotech Ltd. to acquire these data as part of regional investigations into the geologic structure and hydrologic framework of the area. The AEM data have been inverted to produce a series of regional cross-sections that constrain the electrical properties of the subsurface to a depth of ~500m. Data were acquired using the VTEM ET time-domain helicopter-borne electromagnetic system along flight lines that cross important geological structures over... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Shapefile; Tags: Colorado, Crested Butte, East River, GGGSC, Geology, Geophysics, and Geochemistry Science Center, All tags... Gunnison County, Mineral Resources Program, U.S. Geological Survey, USGS, USGS Science Data Catalog (SDC), aeromagnetic surveying, electromagnetic surveying, geophysics, geoscientificInformation, geospatial datasets, groundwater, groundwater flow, hydrogeology, magnetics, near surface, radiometrics, resistivity, Fewer tags Ward NWR, Montana, 2017 Shallow subsurface electrical conductivity was mapped at Ward National Wildlife Refuge (NWR) in northeast Montana using the DUALEM421 electromagnetic sensor (Dualem, Inc., ON, Canada) in the winter of 2017. Data were acquired by towing the DUALEM421 sensor on a sled behind an all-terrain vehicle or snow machine, with the sensor at a nominal height of 0.3 meters (m) above ground surface. Approximately 15 line-kilometers (km) of data were acquired over an area of approximately .5 square-kilometers. Data were manually edited to remove sensor dropouts, lag corrected for apparent offsets between recorded GPS location and data locations for each coil pair, and averaged to a sounding distance of 1m along the survey path;... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: GGGSC, Geology, Geophysics, and Geochemistry Science Center, Montana, NOROCK, National Wildlife Refuge, All tags... Northern Rocky Mountain Science Center, Prairie Pothole Region, STEPPE, Science Team about Energy and Plains and Potholes Environments, Ward, Williston Basin, electromagnetic surveying, electromagnetics, environment, geophysics, geoscientificInformation, groundwater, hydrogeology, resistivity, salinity, water resources, Fewer tags Magnetics Data Surface electrical resistivity tomography, magnetic, and gravity surveys were conducted in July 2017 in the greater East River Watershed near Crested Butte Colorado with a focused effort in Redwell Basin as part of a broader study of the role of bedrock groundwater in the hydrogeology of mineralized mountain watersheds. Approximately ten kilometers of total field magnetics data were acquired on July 29, 2017 with a Geometrics G-858 cesium vapor magnetometer that detects changes in deep (tens of meters to kilometers) geologic structure based on variations in the magnetic properties of different formations. This data release includes the raw and processed magnetics data. They are provided as digital data, and data... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Brush Creek, Colorado, Crested Butte, East River, GGGSC, All tags... Geology, Geophysics, and Geochemistry Science Center, Gothic, Gunnison County, MRP, Mineral Resources Program, Mount Emmons, Oh-be-joyful, Redwell Basin, U.S. Geological Survey, USGS, bouguer anomaly, electrical resistivity tomography, electromagnetic surveying, electromagnetics, environment, free-air anomaly, geophysics, geoscientificInformation, geospatial datasets, gravimeter measurement, gravitational field (earth), gravity, groundwater, hydrogeology, magnetic anomaly maps, magnetic field, magnetic surveying, magnetics, nuclear magnetic resonance, resistivity, water resources, Fewer tags Chirp seismic reflection - shotpoints, tracklines, profile images, and SEG-Y traces for EdgeTech SB-512i chirp data collected during USGS field activity 2017-002-FA In spring and summer 2017, the U.S. Geological Survey’s Gas Hydrates Project conducted two cruises aboard the research vessel Hugh R. Sharp to explore the geology, chemistry, ecology, physics, and oceanography of sea-floor methane seeps and water column gas plumes on the northern U.S. Atlantic margin between the Baltimore and Keller Canyons. Split-beam and multibeam echo sounders and a chirp subbottom profiler were deployed during the cruises to map water column backscatter, sea-floor bathymetry and backscatter, and subsurface stratigraphy associated with known and undiscovered sea-floor methane seeps. The first cruise, known as the Interagency Mission for Methane Research on Seafloor Seeps and designated as field... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Accomac Canyon, Atlantic Margin, Atlantic Ocean, CMHRP, Chincoteague Ridge, All tags... Coastal and Marine Hazards and Resources Program, DOE, DOI, Department of Energy, Department of the Interior, EdgeTech, Keller Canyon, Norfolk Canyon, PNG, R/V Hugh R. Sharp, SB-512i, SEG-Y traces, U.S. Geological Survey, USGS, United States of America, University of Rochester, WHCMSC, Washington Canyon, Woods Hole Coastal and Marine Science Center, chirp, field activity number 2017-002-FA, geoscientificInformation, geospatial datasets, image, location, marine geology, marine geology, marine geophysics, navigational data, oceans, seismic navigation, seismic profile, seismic reflection, seismic reflection methods, shapefile, sub-bottom profiling, trackline navigation, Fewer tags Goose Lake NWR, Montana, 2017 Shallow subsurface electrical conductivity was mapped at Goose Lake National Wildlife Refuge (NWR) in northeast Montana using the DUALEM421 electromagnetic sensor (Dualem, Inc., ON, Canada) in the winter of 2017. Data were acquired by towing the DUALEM421 sensor on a sled behind an all-terrain vehicle or snow machine, with the sensor at a nominal height of 0.3 meters (m) above ground surface. Approximately 15 line-kilometers (km) of data were acquired over an area of approximately 1 square-kilometer. Data were manually edited to remove sensor dropouts, lag corrected for apparent offsets between recorded GPS location and data locations for each coil pair, and averaged to a sounding distance of 1m along the survey... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: GGGSC, Geology, Geophysics, and Geochemistry Science Center, Goose Lake, Montana, NOROCK, All tags... National Wildlife Refuge, Northern Rocky Mountain Science Center, Prairie Pothole Region, STEPPE, Science Team about Energy and Plains and Potholes Environments, Williston Basin, electromagnetic surveying, electromagnetics, environment, geophysics, geoscientificInformation, groundwater, hydrogeology, resistivity, salinity, water resources, Fewer tags USGS National and Global Oil and Gas Assessment Project-Permian Basin Province, Midland Basin, Spraberry Formation Assessment Units The Assessment Unit is the fundamental unit used in the National Assessment Project for the assessment of undiscovered oil and gas resources. The Assessment Unit is defined within the context of the higher-level Total Petroleum System. The Assessment Unit is shown herein as a geographic boundary interpreted, defined, and mapped by the geologist responsible for the province and incorporates a set of known or postulated oil and (or) gas accumulations sharing similar geologic, geographic, and temporal properties within the Total Petroleum System, such as source rock, timing, migration pathways, trapping mechanism, and hydrocarbon type. The Assessment Unit boundary is defined geologically as the limits of the geologic... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Assessment Unit, Continuous Assessment Unit, Energy Resources, Energy Resources, Geology, All tags... Lower Spraberry Continuous Oil Trend, Middle Spraberry Continuous Oil Trend, Midland Basin, National Assessment of Oil and Gas, Natural Gas, Northern Spraberry Conventional Oil, Oil, Permian Basin, Resource Assessment, State of Texas, USGS Science Data Catalog (SDC), Unconventional Assessment Unit, United States of America, energy resources, geoscientificInformation, natural gas resources, noga2000, oil resources, oilgas, permian, petroleum, Fewer tags Gravity Data Surface electrical resistivity tomography, magnetic, and gravity surveys were conducted in July 2017 in the greater East River Watershed near Crested Butte Colorado with a focused effort in Redwell Basin as part of a broader study of the role of bedrock groundwater in the hydrogeology of mineralized mountain watersheds. Ten gravity stations were acquired with a LaCoste and Romberg G-model relative gravimeter to map density variations. This data release includes principal facts for the gravity stations provided as digital data. Data fields are defined in the data dictionary. Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Shapefile; Tags: Brush Creek, Colorado, Crested Butte, East River, GGGSC, All tags... Geology, Geophysics, and Geochemistry Science Center, Gothic, Gunnison County, MRP, Mineral Resources Program, Mount Emmons, Oh-be-joyful, Redwell Basin, U.S. Geological Survey, USGS, bouguer anomaly, electrical resistivity tomography, electromagnetic surveying, electromagnetics, environment, free-air anomaly, geophysics, geoscientificInformation, geospatial datasets, gravimeter measurement, gravitational field (earth), gravity, groundwater, hydrogeology, magnetic anomaly maps, magnetic field, magnetic surveying, magnetics, nuclear magnetic resonance, resistivity, water resources, Fewer tags Norman Lake NWR, North Dakota, 2018 Shallow subsurface electrical conductivity was mapped at Norman Lake National Wildlife Refuge (NWR) in northwest North Dakota using the DUALEM421 electromagnetic sensor (Dualem, Inc., ON, Canada) in the winter of 2018. Data were acquired by towing the DUALEM421 sensor on a sled behind an all-terrain vehicle or snow machine, with the sensor at a nominal height of 0.3 meters (m) above ground surface. Approximately 41 line-kilometers (km) of data were acquired over an area of approximately 2 square-kilometers. At this survey location, the 4m transmitter-receiver horizontal co-panar and perpendicular coil orientations did not function due to equipment malfunction. Data were manually edited to remove sensor dropouts,... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: GGGSC, Geology, Geophysics, and Geochemistry Science Center, NOROCK, National Wildlife Refuge, Norman Lake, All tags... North Dakota, Northern Rocky Mountain Science Center, Prairie Pothole Region, STEPPE, Science Team about Energy and Plains and Potholes Environments, Williston Basin, electromagnetic surveying, electromagnetics, environment, geophysics, geoscientificInformation, groundwater, hydrogeology, resistivity, salinity, water resources, Fewer tags Split-beam echo sounder - navigation points, tracklines, and profile images for Simrad EK60 split-beam echo sounder data collected during USGS field activities 2017-001-FA and 2017-002-FA In spring and summer 2017, the U.S. Geological Survey’s Gas Hydrates Project conducted two cruises aboard the research vessel Hugh R. Sharp to explore the geology, chemistry, ecology, physics, and oceanography of sea-floor methane seeps and water column gas plumes on the northern U.S. Atlantic margin between the Baltimore and Keller Canyons. Split-beam and multibeam echo sounders and a chirp subbottom profiler were deployed during the cruises to map water column backscatter, sea-floor bathymetry and backscatter, and subsurface stratigraphy associated with known and undiscovered sea-floor methane seeps. The first cruise, known as the Interagency Mission for Methane Research on Seafloor Seeps and designated as field... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Accomac Canyon, Atlantic Margin, Atlantic Ocean, Baltimore Canyon, CMHRP, All tags... Chincoteague Ridge, Coastal and Marine Hazards and Resources Program, DOE, DOI, Department of Energy, Department of the Interior, IMMeRSS, Interagency Mission for Methane Research on Seafloor Seeps, Keller Canyon, NOAA-OER, Norfolk Canyon, PNG, R/V Hugh R. Sharp, Simrad .raw format, Simrad EK60 general purpose trancever, Simrad ES38-10 transducer, U.S. Geological Survey, USGS, United States of America, University of Rochester, WHCMSC, Washington Canyon, Woods Hole Coastal and Marine Science Center, field activity number 2017-001-FA, field activity number 2017-002-FA, geoscientificInformation, geospatial datasets, image, location, marine geophysics, marine geophysics, navigational data, oceanography, oceans, scientific echo sounder, shapefile, sonar methods, split-beam echo sounder, split-beam echo sounder navigation, split-beam echo sounder profile, trackline navigation, Fewer tags Medwell NWR, Montana, 2017 Shallow subsurface electrical conductivity was mapped at Medwell National Wildlife Refuge (NWR) in northeast Montana using the DUALEM421 electromagnetic sensor (Dualem, Inc., ON, Canada) in the winter of 2017. Data were acquired by towing the DUALEM421 sensor on a sled behind an all-terrain vehicle or snow machine, with the sensor at a nominal height of 0.3 meters (m) above ground surface. Approximately 9 line-kilometers (km) of data were acquired over an area of approximately 1 square-kilometer. Data were manually edited to remove sensor dropouts, lag corrected for apparent offsets between recorded GPS location and data locations for each coil pair, and averaged to a sounding distance of 1m along the survey path;... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: GGGSC, Geology, Geophysics, and Geochemistry Science Center, Medicine Lake, Medwell, Montana, All tags... NOROCK, National Wildlife Refuge, Northern Rocky Mountain Science Center, Prairie Pothole Region, STEPPE, Science Team about Energy and Plains and Potholes Environments, Williston Basin, electromagnetic surveying, electromagnetics, environment, geophysics, geoscientificInformation, groundwater, hydrogeology, resistivity, salinity, water resources, Fewer tags Anderson NWR, Montana, 2017 Shallow subsurface electrical conductivity was mapped at Anderson National Wildlife Refuge (NWR) in northeast Montana using the DUALEM421 electromagnetic sensor (Dualem, Inc., ON, Canada) in the winter of 2017. Data were acquired by towing the DUALEM421 sensor on a sled behind an all-terrain vehicle or snow machine, with the sensor at a nominal height of 0.3 meters (m) above ground surface. Approximately 25 line-kilometers (km) of data were acquired over an area of approximately 1 square-kilometer. Data were manually edited to remove sensor dropouts, lag corrected for apparent offsets between recorded GPS location and data locations for each coil pair, and averaged to a sounding distance of 1m along the survey path;... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Anderson, GGGSC, Geology, Geophysics, and Geochemistry Science Center, Montana, NOROCK, All tags... National Wildlife Refuge, Northern Rocky Mountain Science Center, Prairie Pothole Region, STEPPE, Science Team about Energy and Plains and Potholes Environments, Sheridan County, Williston Basin, electromagnetic surveying, electromagnetics, environment, geophysics, geoscientificInformation, groundwater, hydrogeology, resistivity, salinity, water resources, Fewer tags Rabenberg NWR, Montana, 2017 Shallow subsurface electrical conductivity was mapped at Rabenberg National Wildlife Refuge (NWR) in northeast Montana using the DUALEM421 electromagnetic sensor (Dualem, Inc., ON, Canada) in the winter of 2017. Data were acquired by towing the DUALEM421 sensor on a sled behind an all-terrain vehicle or snow machine, with the sensor at a nominal height of 0.3 meters (m) above ground surface. Approximately 32 line-kilometers (km) of data were acquired over an area of approximately 1 square-kilometer. Data were manually edited to remove sensor dropouts, lag corrected for apparent offsets between recorded GPS location and data locations for each coil pair, and averaged to a sounding distance of 1m along the survey... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: GGGSC, Geology, Geophysics, and Geochemistry Science Center, Montana, NOROCK, National Wildlife Refuge, All tags... Northern Rocky Mountain Science Center, Prairie Pothole Region, Rabenberg, STEPPE, Science Team about Energy and Plains and Potholes Environments, Sheridan County, Williston Basin, electromagnetic surveying, electromagnetics, environment, geophysics, geoscientificInformation, groundwater, hydrogeology, resistivity, salinity, water resources, Fewer tags 1 2 »