In 2010, for the Alberta Geological Survey Saline Aquifer Mapping Project, we collected and analyzed 38 water samples from oil wells producing from geological units, including the Glauconitic, Ostracod, Ellerslie, Banff, Wabamun, Nisku, Leduc and Cooking Lake, within 100 km of Edmonton, Alberta. We analyzed filtered water samples for pH, density and specific conductance. oxygen, hydrogen and strontium isotopes. and dissolved constituents, including sodium, potassium, calcium, magnesium, barium, strontium, lithium, iron, manganese, chloride, bromide, sulphate, sulphide, silica and inorganic carbon.

This point dataset contains water-level information concerning depth to water, potentiometric-surface altitude, and saturated thickness for the shallow groundwater system at selected well and borehole locations in the Lower Gunnison River Basin in Delta, Montrose, Ouray, and Gunnison Counties, Colorado. Depth-to-water data were compiled from measurements reported by the Colorado Division of Water Resources, U.S. Geological Survey, and Bureau of Reclamation. Potentiometric-surface altitude values were computed from the potentiometric-surface altitude raster dataset (potalt). Saturated-thickness values were computed from the saturated-thickness raster dataset (satthk). The U.S. Geological Survey prepared this dataset in cooperation with the Colorado Water Conservation Board.

This point dataset contains water-level information concerning depth to water, potentiometric-surface altitude, and saturated thickness for the shallow groundwater system at selected well and borehole locations in the Lower Gunnison River Basin in Delta, Montrose, Ouray, and Gunnison Counties, Colorado. Depth-to-water data were compiled from measurements reported by the Colorado Division of Water Resources, U.S. Geological Survey, and Bureau of Reclamation. Potentiometric-surface altitude values were computed from the potentiometric-surface altitude raster dataset (potalt). Saturated-thickness values were computed from the saturated-thickness raster dataset (satthk). The U.S. Geological Survey prepared this dataset in cooperation with the Colorado Water Conservation Board.

The U.S. Geological Survey (USGS) in cooperation with the California State Water Resources Control Board (State Water Board) compiled and analyzed data for mapping groundwater salinity, characterizing aquifer systems, and documenting the effects of oil field water injection in the Elk Hills Elk Hills, Buena Vista, and Coles Levee Oil Fields, San Joaquin Valley, California. Data provided in this data release include borehole geophysical data, geochemical analyses of water samples, hydrologic data, geological formation depths, and information on observed well log resistivity anomalies—interpreted to be from injection for disposal of produced water from oil wells or from natural causes. The data reported here were used in an accompanying interpretive manuscript describing aquifer salinity and the effects of produced water disposal in the study area. The geochemical data were compiled for water samples from 14 water source wells to supply groundwater for oil and gas operations and one groundwater monitoring well. The constituents compiled from geochemical data sources included water-quality indicators and detected concentrations of major ions, minor ions, and trace elements. The data represent several decades and most originated from oil and gas producers which are archived in scanned pages in raster format on the California Geologic Energy Management Division (CalGEM) website. The data were compiled into computer readable numerical data sets for the related study. Other data, such as interpolated surfaces of geologic layers, were created for the study based on information in drilling records and are provided here. All the data and the associated manuscript are part of the State Water Board Oil and Gas Regional Monitoring Program and the associated USGS California Oil, Gas, and Groundwater (COGG) Program.

The U.S. Geological Survey (USGS) in cooperation with the California State Water Resources Control Board (State Water Board) compiled and analyzed data for mapping groundwater salinity, characterizing aquifer systems, and documenting the effects of oil field water injection in the Elk Hills Elk Hills, Buena Vista, and Coles Levee Oil Fields, San Joaquin Valley, California. Data provided in this data release include borehole geophysical data, geochemical analyses of water samples, hydrologic data, geological formation depths, and information on observed well log resistivity anomalies—interpreted to be from injection for disposal of produced water from oil wells or from natural causes. The data reported here were used in an accompanying interpretive manuscript describing aquifer salinity and the effects of produced water disposal in the study area. The geochemical data were compiled for water samples from 14 water source wells to supply groundwater for oil and gas operations and one groundwater monitoring well. The constituents compiled from geochemical data sources included water-quality indicators and detected concentrations of major ions, minor ions, and trace elements. The data represent several decades and most originated from oil and gas producers which are archived in scanned pages in raster format on the California Geologic Energy Management Division (CalGEM) website. The data were compiled into computer readable numerical data sets for the related study. Other data, such as interpolated surfaces of geologic layers, were created for the study based on information in drilling records and are provided here. All the data and the associated manuscript are part of the State Water Board Oil and Gas Regional Monitoring Program and the associated USGS California Oil, Gas, and Groundwater (COGG) Program.

These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. Note that this data release has been modified from its original version. This data release was originally published on the U.S. Geological Survey (USGS) Water Mission Area NSDI Node (Node) in 2008. The Node has since been deprecated, and the data release was revised and, in 2023, the files were moved over to Sciencebase, which is a USGS trusted digital repository. When this migration of files initially took place, each unit extent and surface file for the Mississippi embayment aquifer system was given its own landing page. The 2025 version of this data release revised the 2023 revision. This 2025 version regrouped the extents, surfaces, and metadata files, presenting them on one Sciencebase landing page. A new master metadata file was compiled to document all the datasets and each surface altitude raster is presented in three formats: ASCII, GRID, and TIFF (a new format). The 2025 version of the data release was created to make the spatial data more accessible to the user and to simplify the ScienceBase catalog. The following list of Digital Object Identifiers (DOI) are from the 2023 revision pages and have been deprecated and superseded by this data release's DOI (doi:10.5066/P1VRSZLE). Deprecated DOIs: doi:10.5066/P913ILLC, doi:10.5066/P9PV92DD, doi:10.5066/P99DN2Q7, doi:10.5066/P90OQTTN, doi:10.5066/P97M18BU, doi:10.5066/P9TKXK1S, doi:10.5066/P9PEIHPU, doi:10.5066/P97WO9AD, doi:10.5066/P95QSYP9, doi:10.5066/P9OX7ATU, doi:10.5066/P9MMLD4I, doi:10.5066/P9QIJ2UX, doi:10.5066/P96ERE0X, doi:10.5066/P9OMYUX4, doi:10.5066/P9C2AXIZ, doi:10.5066/P913AT6B, doi:10.5066/P9VJ7FHM, doi:10.5066/P95UZ2X7, doi:10.5066/P9JHYMO3 This data release provides outcrop and subcrop extents and digital surfaces containing the top altitude of the following hydrogeologic units in Arkansas, Alabama, Louisiana, Missouri, Mississippi, and Tennessee. The abbreviations used for each hydrogeologic unit is listed below. These abbreviations are used in names of the data release files. Extent file names end in "_extent" and the raster file names end in "_surf". 1. alvm - Mississippi River Valley Alluvial Aquifer (extent only) 2. vkbg - Vicksburg-Jackson Group 3. ucaq - Upper Claiborne aquifer 4. mccu - Middle Claiborne confining unit 5. mcaq - Middle Claiborne aquifer 6. lccu - Lower Claiborne confining unit 7. lcaq - Lower Claiborne aquifer 8. mwaq - Middle Wilcox aquifer 9. lwaq - Lower Wilcox aquifer 10. mdwy - Midway confining unit The hydrogeologic unit surface datasets contain 414 rows and 394 columns representing 1-mile grid spacing. In general, limitations of data interpolation included areas of sparse geophysical log control points, log datums not clearly defined for some logs, unknown exact extent of each hydrogeologic unit in subcrop, interpolation limitations, and values averaged over 1-mile grid spacing. This data release contains data sets that characterize the Mississippi embayment aquifer system. These data sets were assembled as part of the Mississippi Embayment Regional Aquifer Study (MERAS) as described in the associated report (Hart, R.M., Clark, B.R., and Bolyard, S.E., 2008, Digital surfaces and thicknesses of selected hydrogeologic units within the Mississippi Embayment Regional Aquifer Study (MERAS): U.S. Geological Survey Scientific Investigations Report 2008-5098, 33 p.) and utilized in the MERAS groundwater-flow model (Clark, B.R., and Hart, R.M., 2009, The Mississippi Embayment Regional Aquifer Study (MERAS): Documentation of a groundwater-flow model constructed to assess water availability in the Mississippi Embayment: U.S. Geological Survey Scientific Investigations Report 2009-5172, 61 p.) A supplementary shapefile containing the extent of the MERAS

This dataset describes water-level and associated data for wells open to various hydrogeologic units of Delaware that were used to create potentiometric surface contours for selected aquifers that underlie both the Coastal Plain of northern and central Delaware, and southern New Jersey. Water-level measurements were collected during October 2013.

This dataset describes water-level and associated data for wells open to various hydrogeologic units of Delaware that were used to create potentiometric surface contours for selected aquifers that underlie both the Coastal Plain of northern and central Delaware, and southern New Jersey. Water-level measurements were collected during October 2013.

This data set represents the extent of the Mississippian aquifers which is in the uppermost aquifer in Paleozoic rocks of northern Missouri.

This data set represents the extent of the Mississippian aquifers which is in the uppermost aquifer in Paleozoic rocks of northern Missouri.