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High-frequency stratigraphic sequences that comprise the Desert Member of the Blackhawk Formation, the Lower Castlegate Sandstone, and the Buck Tongue in the Green River area of Utah display changes in sequence architecture from marine deposits to marginal marine deposits to an entirely nonmarine section. Facies and sequence architecture differ above and below the regionally extensive Castlegate sequence boundary, which separates two low-frequency (106-year cyclicity) sequences. Below this surface, high-frequency sequences are identified and interpreted as comprising the highstand systems tract of the low-frequency Blackhawk sequence. Each high-frequency sequence has a local incised valley system on top of the wave-dominated...
Digital files of basement structure in Colorado, including structure contours on top of Precambrian basement rock, selected wells drilled to Precambrian and Lower Paleozoic rocks, sedimentary basins, major oil and gas fields, Precambrian and Upper Cretaceous to Tertiary volcanic and intrusive rock outcrops. Major sedimentary basins and arches, as well as Precambrian mountain ranges and volcanic fields are included. Also included are 73 gas fields and 129 oil fields.
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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 the Humboldt River Basin, Northern Nevada by D.A. Ponce. The data are represented on figure 6-9 in this publication and were later provided as raster format geospatial digital data via written communication from D.A. Ponce in 2007. The data have been reprojected but are otherwise as provided. A thorough explanation of the production methods is available in the larger work.
Core Research Center, core E898, from well operated by USGSRaw Properties from download, web scrape, MapServer, and Macrostrat API{"Lib Num": "E898", "API Num": "5010320008", "Operator": "USGS", "Well Name": "ATIGARU POINT", "Field": "EXPLORATORY", "State": "AK", "County": "HARRISON BAY", "Type": "SLABBED", "Photos": "T", "Thin Sec": "F", "Analysis": "T", "Latitude": "70.55612", "Longitude": "-151.717183", "coordinates_geohash": "bss17s6gjqhc", "Source": "FROM STATE RECORDS", "Security Flag": "NO SPECIAL RESTRICTIONS", "crc_collection_name": "core", "sb_parent_id": "4f4e49dae4b07f02db5e0486", "intervals": [{"Formation": "BASEMENT", "Age": "PERM", "Min Depth": "11520", "Max Depth": "11538"}, {"Formation": "SADLEROCHIT",...
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Select samples were collected from boreholes in Arctic Alaska to determine the U-Pb ages of zircon to determine a maximum depositional age of the geologic units and/or provenance of the zircon in the samples. Samples were collected from the Department of Natural Resources-Alaska Geologic Materials Center in Anchorage Alaska and sent to U.S. Geological Survey-Geology, Geophysics and Geochemistry Science Center, Denver, CO for mineral separation and laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) U-Pb geochronology analyses. The information is this report includes LA-ICPMS analyses conducted between 2016 and 2018 of at least 120 zircon grains or more (if recovered from sample) from twenty samples...
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The depth of the basin beneath Frenchman Flat is estimatedusing a gravity inversion method.This dataset is distributed as an XYZ ASCII format data filegenerated from the 2002 gravity inversion model of the bedrockbeneath Frenchman Flat basin. Data forms a rectangular grid ofdata values in the defined projection. The data values are thedepth below the land surface,in meters, of the modeled locationof the Pre-Tertiary basement surface. The report whichaccompanies the data explains the modeling process and results.
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We present a numeric grid containing estimates of the depth to the pre-Cenozoic basement for the western United States. Values for these grids were combined and integrated from previous studies or derived directly from gravity analyses. The grids are provided with 1-km grid-node spacing in WGS84 latitude-longitude coordinates. Detailed information regarding the derivation of these estimates is provided by Shah, A.K. and Boyd, O.S., 2018, Depth to basement and thickness of unconsolidated sediments for the western United States - Initial estimates for layers of the U.S. Geological Survey National Crustal Model: U.S. Geological Survey Open-File Report 2018-1115, https://doi.org/10.3133/ofr20181115.
This data includes permit number, API, well type, county, PLSS, lat/long, company name, lease name and number, total depth, completion date, plugging date, comments, whether there are logs, LAS or digital files, sample type, elevation and elevation source, depth to top of precambrian and Mount Simon formations.
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Seismic hazard assessments depend on an accurate prediction of ground motion, which in turn depends on a base knowledge of three-dimensional variations in density, seismic velocity, and attenuation. The datasets here are components of a National Crustal Model that couples geologic characteristics and geophysical parameters using a physical theoretical foundation combined with measured data for calibration. The model is intended to be internally consistent and seamless on a national scale; care is also taken to maximize consistency with existing regional models. An initial version of the model components are defined for the western U.S. on a 1-km grid. While the current focus of this effort is on improving estimates...


    map background search result map search result map Gravity inversion model of Frenchman Flat basin, Nevada Test Site, Nevada Depth to pre-Cenozoic bedrock in northern Nevada Components of the USGS National Crustal Model Depth to Mesozoic basement for the USGS National Crustal Model U-Pb detrital zircon geochronology of cores and cuttings from selected wells in Arctic Alaska Core Research Center Core E898 Michigan Critical Minerals FY2019 Lower Peninsula Precambrian Wells Gravity inversion model of Frenchman Flat basin, Nevada Test Site, Nevada Michigan Critical Minerals FY2019 Lower Peninsula Precambrian Wells U-Pb detrital zircon geochronology of cores and cuttings from selected wells in Arctic Alaska Depth to pre-Cenozoic bedrock in northern Nevada Depth to Mesozoic basement for the USGS National Crustal Model Components of the USGS National Crustal Model