Horton, John D.

About the author

U.S. Geological Survey, Central Region, Rocky Mountain area, Geology discipline
Abandoned mines and quarries, Aluminum, Antimony, Arsenic, Atomic absorption analysis, Atomic emission spectroscopy, Barium, Bedrock geologic units, Beryllium, Bismuth, Boron, Cadmium, Calcium, Cerium, Cesium, Chemical analysis, Chemical elements, Chlorine, Chromium, Coal resources, Cobalt, Copper, Datasets, Digitization, Dysprosium, Economic geology, Environmental health (human), Erbium, Europium, Field inventory and monitoring, Fluorine, Gadolinium, Gallium, Geochemistry, Geologic contacts, Geologic history, Geologic maps, Geologic structure, Geology, Geospatial analysis, Geospatial datasets, Geothermal resources, Germanium, Groundwater, Groundwater flow, Holmium, Information system design and development, Iron, Isotopic analysis, Lanthanide series elements, Lanthanum, Lead, Liquid chromatography, Lithium, Lutetium, Magnesium, Manganese, Manuals, Mass spectroscopy, Mathematical modeling, Mathematical simulation, Metallic mineral resources, Mineral deposits, Mineral resources, Mining and quarrying, Molybdenum, Natural resource assessment, Natural resource exploration, Neodymium, Nickel, Niobium, Oxygen content (water), Phosphorus, Potassium, Praseodymium, Promethium, Rare earth elements, Rocks and deposits, Rubidium, Samarium, Scandium, Sedimentary rocks, Selenium, Silver, Sinkhole formation, Sodium, Soil chemistry, Specimen collecting, Stratigraphic sections, Strontium, Study areas, Surface water quality, Surficial geologic units, Tantalum, Terbium, Thallium, Thorium, Thulium, Titanium, Topographic maps, Toxic trace element contamination, Tracer study, Transect sampling, Tungsten, Unconsolidated deposits, Uranium, Vanadium, Water pH, Water sampling, Water temperature, Ytterbium, Yttrium, Zinc, Zirconium, Faults, Mine sites, Mineral deposit areas, Sedimentary rock, Copper, ArcInfo interchange, DBF, FileMaker, Microsoft Access format, Microsoft Excel format, OGC WMS, OGC WMTS, Portable Document Format, Comma-delimited text, File geodatabase (ESRI), Scientific application software, Shapefile, Rare earths

The State Geologic Map Compilation (SGMC) Geodatabase of the Conterminous United States

A collection of state geological maps using the same underlying database structure. Updates the preliminary state geologic map compilation released in 2005, with corrections and seven updated state geologic maps as well as seven new state geologic maps.

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Prospect- and mine-related features on USGS topographic maps

Symbols indicating mining-related features digitized from historical USGS topographic maps in the western part of the conterminous US. Includes prospect pits, mine shafts and adits, quarries, open-pit mines, tailings piles and ponds, gravel and borrow pit

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GIS and data tables for focus areas for potential domestic nonfuel sources of rare earth elements

Locations of focus areas to be used for planning and collection of geophysical, geological, and topographic (lidar) data pertaining to the study of rare earth element resources in the US.

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Preliminary integrated geologic map databases for the United States: Alabama, Florida, Georgia, Mississippi, North Carolina, and South Carolina

Digital geologic map information with a consistent set of attributes, part of a national compilation of similar maps. Available in formats compatible with GIS.

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Preliminary integrated geologic map databases for the United States: Delaware, Maryland, New York, Pennsylvania, and Virginia

Digital geologic map information with a consistent set of attributes, part of a national compilation of similar maps. Available in formats compatible with GIS.

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Preliminary integrated geologic map databases for the United States: Kentucky, Ohio, Tennessee, and West Virginia

Digital geologic map information with a consistent set of attributes, part of a national compilation of similar maps. Available in formats compatible with GIS.

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Preliminary integrated geologic map databases for the United States: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, Rhode Island and Vermont

Digital geologic map information with a consistent set of attributes, part of a national compilation of similar maps. Available in formats compatible with GIS.

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History and evaluation of national-scale geochemical data sets for the United States

Overview explaining how and why six different geochemical data sets were produced, and why you might choose to use the data in any one of these instead of the others.

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A modified procedure for mixture-model clustering of regional geochemical data

<p>A modified procedure is proposed for mixture-model clustering of regional-scale geochemical data. The key modification is the robust principal component transformation of the isometric log-ratio transforms of the element concentrations. This principal

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Water and rock geochemistry, geologic cross sections, geochemical modeling, and groundwater flow modeling for identifying the source of groundwater to Montezuma Well, a natural spring in central Arizona

This report releases data, cross section, and model information related to the identification of travel paths for groundwater supply and principal stratigraphic and structural features that serve as constraints or conduits for groundwater movement.

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Descriptive models, grade-tonnage relations, and databases for the assessment of sediment-hosted copper deposits--with emphasis on deposits in the Central Africa Copperbelt, Democratic Republic of the Congo and Zambia

This report describes compilation and evaluation results of data from the USGS global mineral assessment including new descriptive mineral-deposit and grade and tonnage models and spatial databases for deposits and occurrences, ore bodies and open pits.

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Major- and trace-element concentrations in soils from two continental-scale transects of the United States and Canada

Spreadsheets containing geochemical data for soils

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Sediment-hosted stratabound copper assessment of the Neoproterozoic Roan Group, central African copperbelt, Katanga Basin, Democratic Republic of the Congo and Zambia

This study area encompasses the greatest sediment-hosted copper-cobalt province in the world, containing 152 million metric tons of copper in greater than 80 deposits.

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Geochemical data for stream-sediment, surface-water, rock, and vegetation samples from Red Mountain (Dry Creek), an unmined volcanogenic massive sulfide deposit in the Bonnifield district, Alaska Range, east-central Alaska

Geochemical data for stream sediment, surface-water, rock, precipitate, and vegetation samples from Red Mountain

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Geology and mineral resources of the Southwestern and South-Central Wyoming Sagebrush Focal Area, Wyoming, and the Bear River Watershed Sagebrush Focal Area, Wyoming and Utah

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Geology and mineral resources of the North-Central Idaho Sagebrush Focal Area: Chapter C in Mineral resources of the Sagebrush Focal Areas of Idaho, Montana, Nevada, Oregon, Utah, and Wyoming

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Geology and mineral resources of the North-Central Montana Sagebrush Focal Area: Chapter D in Mineral resources of the Sagebrush Focal Areas of Idaho, Montana, Nevada, Oregon, Utah, and Wyoming

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