Data Releases
The data collected and the techniques used by USGS scientists should conform to or reference national and international standards and protocols if they exist and when they are relevant and appropriate. For datasets of a given type, and if national or international metadata standards exist, the data are indexed with metadata that facilitates access and integration.
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Argon data for samples from Kenya and Ethiopia Argon data for samples from Kenya and Ethiopia
Ar/Ar data are for 12 samples that record the eruption age of tephra. The geochronology provides time constraints for the ages of tephra and interbedded sediments and fossils from Kenya and Ethiopia. Samples were collected by Erin Dimaggio (Pennsylvania State University), who brought them to the USGS Denver Argon Geochronology Laboratory for Ar/Ar analysis. Samples were analyzed in...
Detrital zircon U-Pb data for reconnaissance characterization of strata across the Intermountain West region of the United States Detrital zircon U-Pb data for reconnaissance characterization of strata across the Intermountain West region of the United States
This document describes sedimentary rock samples and their associated detrital zircon U-Pb data that were collected to support geologic mapping and research initiatives within the context of the Geologic Framework of the Intermountain West Project. The data characterize the age and/or provenance of Neoproterozoic to Miocene strata exposed across the Intermountain West region of the...
Towards an integrated theory of body size distributions, life history and functional traits, and environmental flows in freshwater ecosystems Towards an integrated theory of body size distributions, life history and functional traits, and environmental flows in freshwater ecosystems
Efforts to quantify and explain individual size distributions (ISD) are prominent in ecological research and potentially for applications to management which increasingly consider ecosystem-scale objectives. We use a nation-wide database of individual size measurements for United States stream fishes paired with species’ traits and test for direct and indirect effects of traits, flow...
Model and Data Resources Supporting Water-Quality Modeling of Hydrologic Systems Model and Data Resources Supporting Water-Quality Modeling of Hydrologic Systems
This dataset provides detailed information on availability of model resources (including models and datasets) that support the modeling of six key water-quality constituents (or constituent categories) across the hydrologic system. In addition, resources associated with nine “cross-cutting” topics for modeling water quality are included, with “cross-cutting” defined herein as having...
Fish assemblages and habitat conditions of the Saint Lawrence River and its Tributaries Fish assemblages and habitat conditions of the Saint Lawrence River and its Tributaries
Biodiversity measures provide insight into ecological processes like productivity and ecosystem stability, and rare, vulnerable species are a major component of freshwater biodiversity. This data release provides the data used to address multiple ecological questions about fish and habitat conditions throughout a large section of the St. Lawrence River Valley. More than 140,000 fishes of...
Ungulate Migrations of the Western United States, Volume 5 Ungulate Migrations of the Western United States, Volume 5
This is the data archive for the publication Ungulate Migrations of the Western United States, Volume 5 and includes the collection of GIS map files that are mapped and described in the report. These map files are meant to provide a common spatial representation of the mapped migrations and seasonal ranges. This data release provides the means for ungulate migrations to be mapped and...