Data

The ~21 m deep Mammoth Site (MS) bone bed site at Hot Springs, South Dakota, provides a unique opportunity to reconstruct paleoenvironmental conditions on the northern Great Plains of the United States. Past published radiocarbon analyses of mammoth bones found within the MS sinkhole suggested they were deposited ~23-42 ka. However, two U-series ages ranging between 129-150 ka and a

This data release contains eight luminescence samples collected for USGS Science Investigations Map, "Quaternary geologic map of the Mesquite Springs fault zone, San Bernardino County, California", of the Mesquite Hills (north of Ludlow CA about halfway between I-15 and I-40). The samples were analyzed by infrared stimulated luminescence (IRSL) and produced ages between ~33 ka and ~200...

This report and accompanying maps and database address the geologic and geophysical character of a block of ten 7.5’ quadrangles that span the San Gorgonio Pass region. The study culminates more than four decades of intermittent geologic and geophysical mapping investigations by the U.S. Geological Survey (USGS). Published results from these investigations fall into two categories: (1)...

Laminated soil carbonate rinds are a Quaternary paleoclimate archive whose isotope composition is linked to soil formation conditions. At Rio Mesa, Utah (USA), we investigated the fidelity of rind records in a river terrace setting by determining the seasonal timing of rind formation and testing for inter-record replication. We infer soil carbonate formed in the spring season...

The following report summarizes the dating results from sedimentary deposits discovered during paleoseismic investigations of Puerto Rico. Within this report, we detail the methodology used by the USGS Luminescence Geochronology Laboratory to obtain ages including sample preparation methods, luminescence measurement, equivalent dose determination, and dating-related calculations. We...

Large Igneous Provinces (LIPs) are associated with dramatic changes to the Earth system; their rapid release of carbon to the surface environment may initiate catastrophic climatic changes that cause mass extinction. This carbon release is often associated with volcanic emissions, yet metamorphic carbon production during LIP events may be substantial. Metamorphic carbon devolatilization...

A multi-stage ensembled machine learning model was developed to estimate metal abundances in seafloor massive sulfide deposits worldwide. The modeling framework integrates (1) KMeans++ clustering to identify geochemical groupings based on enrichment controls, (2) Random Forest classification to assign geochemical labels to vent fields with incomplete or absent geochemical data, and (3)...

A new dataset for macroseismic intensity from crustal earthquakes in the Western United States is developed by combining the USGS Did You Feel It? (DYFI) data set with historical intensity data (Atkinson et al., 2014; Salditch et al., 2020). The metadata compiled for the data set includes the earthquake magnitude, rupture distance, time-averaged shear-wave velocity in the upper 30 m...

Magnetic susceptibility measurements in the vicinity of the Mesquite Hills, San Bernardino County, California. Susceptibility measurments, made with a Terraplus KT10 magnetic susceptibility meter, were collected on various igneous rocks in the Mesquite HIlls area to better characterize the magnetic properties of igneous rocks in the region. Mafic rocks in the areas are reliably magnetic...

The U.S. Geological Survey (USGS) collects magnetic susceptibility measurements on in-situ and laboratory rock samples to help identify the sources of anomalies in aeromagnetic surveys in Alaska. Magnetic susceptibility is a measure of how much a material will become magnetized in an applied magnetic field and is the ratio of magnetization, M (magnetic moment per unit volume), to the...

This data release provides access to magnetics data collected by the AUV Sentry during the TN403 cruise in the Escanaba Trough (USGS Field Activity 2022-621-FA).

Mainstem rivers serve as the backbone of a connected network of hydrologic units that cover the landscape. A mainstem connects a headwater source area to an outlet. The series of data releases, Mainstem Rivers of the Conterminous United States, referred to as "Mainstems", identifies the same mainstem paths across spatial scales in hydrographic datasets for the United States. This data...