Data

Mineralized breccias at Hicks Dome, Illinois host abundant fluorspar, Pb-Zn sulfides, barite, rare earth elements (REE), and high field strength elements (HFSE). The REE+HFSE mineralogy of breccias between 600 and 900 meters were examined and mineral compositions were determined by electron probe microanalysis (EPMA), using a JEOL 8530F Plus field emission electron microprobe at the U.S

A terrain-based map of a large area of Franciscan Complex delineates varied areas of erosionally resistant topography and contrasting subdued topography distinguished using differences in the detailed shapes of individual topographic elements that in these rocks indicate relatively intact rock or mélange. Most of the line work in the map is based on interpretation of small-scale aerial...

This data release provides digital flight-line and gridded data for a high-resolution airborne magnetic and radiometric survey over a part of west central Utah. The survey was acquired as part of the UGSS Earth Mapping Resource Initiative (Earth MRI) to improve our understanding of the fundamental geologic framework of the region with applications to evaluating natural resources and...

This data release contains principal facts of gravity measurements by previous studies and collected by the U.S. Geological Survey in 1994-2023 and a compilation of existing and new density and magnetic susceptibility data in northeastern California. Gravity data are processed to isostatic anomalies using reduction densities of 2670 and 2200 kilogram/cubic meter. This region is at the...

The report titled "Field Trip to a Laramide Low-Angle Subduction Channel: Orocopia Schist in the Gavilan Hills, Southeasternmost California with Incidental Localities for Three Blue Minerals", which is associated with this Data Release, describes a one-day field trip to examine a latest Cretaceous subduction channel exposed in a readily accessible area of southeasternmost California, 40...

This data release contains (1) principal facts of gravity measurements collected by the U.S. Geological Survey in 2000-2004 (usgs_iso.csv) and (2) inputs to a gravity inversion of Cenozoic basin thickness based on those gravity and previous measurements. Gridded data (geotiffs.zip) consist of the input isostatic gravity grid as well as grids of Cenozoic basin thickness and basement...

This data release includes microfossil data, including flora and fauna lists, as well as microfossils zonation and numeric age range, for samples collected in and around the San Andreas Fault Zone in and near Pinnacles National Park between 2010-2012.

This data release provides ground magnetic data collected in May 2025 at the Mammoth Magnetic Anomaly (MMA) site in Pinal County, Arizona. These data were collected to validate and characterize a large aeromagnetic anomaly observed in an airborne survey of southeastern Arizona (Scheirer et al., 2025). The geophysical fieldwork was funded by the Earth Mapping Resources Initiative. Ground...

Bradley Peak and South Pass are two ca. 2.7 Ga greenstone terranes in the Archean Wyoming Province, USA that contain mafic-ultramafic metavolcanic rocks. This dataset contains five Comma Separated Value (CSV) files of tabular data, a data dictionary for tabular data (Data_Dictionary.csv), a shapefile with sample locations, and microXRF images. Wholerock_geochemistry.csv includes whole...

This data release contains (1) principal facts of gravity measurements by previous studies and collected by the U.S. Geological Survey in 2006-2024, (2) geophysical grids, and (3) horizontal gradient maxima derived from gravity and magnetic potential fields of the Healdsburg 30 by 60 minute quadrangle, California. Gridded data are provided in geotiff format. These data support modeling...

This data release represents samples collected in 1981 along a series of five marine terraces between Ano Nuevo and Santa Cruz in California as a part of a U.S. Geological Survey project led by Dennis Marchand to study soil chronosequences in the Western United States. These sequential surfaces of soils have similar key elements for development in the slope, climate, vegetation, and...

This report and associated dataset, contains subsurface geologic information collected in the Sacramento-San Joaquin Valley. The primary data includes X, Y, Z locations of stratigraphic horizons and, to a much lesser extent, geologic structures where penetrated by oil and gas wells in the subsurface as recorded in well logs and well records. Selected oil and gas wells are not only...