Data

The Sulphur Bank Mercury Mine in Lake County, California, was the site of historical mercury mining from 1880s through 1973.Since 1990, the mine area has been a Superfund site managed by the U.S. Environmental Protection Agency (USEPA). As part of a Remedial Investigation, the USEPA and the U.S. Geological Survey (USGS) are collaborating on a groundwater investigation in a part of the...

Clear Lake, located in Lake County, California, is impacted by mercury contamination associated with the historic Sulfur Bank mercury mine, which is adjacent to the lake’s eastern shore / Oaks Arm region. As part of a larger study designed to better understand the biogeochemical cycling of mercury in Clear Lake, shallow sediment (top 0-2 cm or 0-4 cm) was sampled from the three major...

In 2023, the U.S. Geological Survey, in cooperation with Riverside Energy Michigan, LLC, conducted an injection experiment to monitor the natural rate of biogenic methane generation in the Mortensen A4-24 well which was completed in the Antrim Shale and located in Antrim County, Michigan, United States of America. Approximately 20 barrels (bbl) of produced water was pumped from the well...

This dataset includes water-quality data collected at 16 sites in the Clear Lake Drainage Basin, Lake County, California, between November 2018 and March 2025. Sampling targeted high-flow events following rainfall and baseline conditions during the wet season (typically December through April) across multiple water years (WYs), with expanded coverage in WYs 2022–2024 and new data added...

Geochemical and mineralogical characterization data was collected for samples of the Greenhorn Formation taken from the USGS Portland 1 core, which is stored in the USGS Core Research Center (library number E099 https://my.usgs.gov/crcwc/core/report/11834). The data was integrated with sedimentological descriptions in a manuscript (Flaum and others, 2025) that includes revised...

Geochemical data were generated from multiple thermally immature drill cores of the Eagle Ford Group across Texas. This data set accompanies a journal article that shows the relationship between whole rock S/Fe and degree of organic sulfurization across the thermally immature Eagle Ford in Texas. The data include LECO total carbon and total organic carbon, programmed pyrolysis, whole...

The layered mafic and ultramafic Stillwater Complex in southwest Montana is known for its platinum-group element (PGE) production from reef-style mineralization (J-M Reef) in the Lower Banded series. Rocks near the base of the complex—the Basal series and Ultramafic series, Peridotite zone—also host elevated concentrations of Ni, Cu, Co, Cr, and PGE. These rocks of the complex’s lower...

This release of geochemical data for the northern Mojave Desert is for 330 volcanic rocks sampled over 43 years, with an emphasis on basaltic rocks. It supports a field trip road log in the 2024 Geological Society of America Field Trip Guidebook for the Annual Meeting to be held in Anaheim, CA.

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 geochemical data, thin section images, and modal mineralogy from bedrock samples collected in the western half of the Emporia 30’ x 60’ quadrangle, Virginia and North Carolina. The geochemical data comprise whole-rock major oxide and trace element abundances in 246 samples. Pairs of thin section images in plane-polarized light and cross-polarized light are...

This data release contains field and geochemical data, discharge measurements, and descriptive observations for 261 springs in eastern Oregon and northern Nevada. Data were collected during water years 2016–2023. The data release also includes quality assurance analyses and the results of a logistic model documented in the accompanying study report (Johnson, in review).

This U.S. Geological Survey (USGS) data release includes whole-rock major, trace, and rare earth element geochemical data, whole-rock Nd-Pb-Sr isotopic data collected by thermal ionization mass spectrometry (TIMS), and zircon U-Pb isotopic data collected by laser ablation-inductively coupled mass spectrometry (LA-ICP-MS) methods. These data provide constraints on, and characterize, the...