Data from 316 boreholes (including coreholes) that penetrated buried pre-Middle Jurassic basement rocks that lie beneath Atlantic and Gulf Coastal Plain sedimentary deposits in Florida and Alabama were compiled from non-proprietary, mostly published sources in order to support subsurface geologic mapping, geologic interpretation of geophysical data (aeromagnetic, gravity, seismic), topical studies as in geochronology, and applications ranging from mineral, energy, and water resources to earthquake hazards. Boreholes into bedrock beneath the coastal plain near the Fall Line in Alabama reveal buried extensions of geologic units exposed in the Piedmont, and those near the Gulf coast and beneath Florida provide rare insights into deeply buried rock units that have no surface exposures. Data for each borehole include the State, a unique identifier (well_ID), borehole name or location, year drilled, land surface elevation in feet, top-of-basement depth in feet, total depth of borehole in feet, top-of-basement elevation in feet, basement penetrated by drilling in feet, depth reference (ground level, Kelly bushing, or derrick floor), lithology code, basement type, quality of lithologic data, description of pre-Cretaceous basement rock, sample (drill core or cuttings), latitude and longitude (NAD27), county or city, and reference citations. The data in comma separated values (.csv) format are accompanied by an explanation (.txt), references (.txt), and metadata (.xml). The data file uses standard abbreviations for mineral names where necessary to save space.

Data from 391 boreholes (including coreholes) that penetrated buried pre-Cretaceous basement rocks that lie beneath Atlantic Coastal Plain sedimentary deposits in Georgia and South Carolina were compiled from non-proprietary, mostly published sources in order to support subsurface geologic mapping, geologic interpretation of geophysical data (aeromagnetic, gravity, seismic), topical studies as in geochronology, and applications ranging from mineral, energy, and water resources to earthquake hazards in the Charleston seismic zone. Most of the entries are based on previous literature. In a few cases where noted, drill cores or cuttings were examined for basic geologic observations. Boreholes into bedrock beneath the coastal plain near the Fall Line reveal buried extensions of geologic units exposed in the Piedmont, and those closer to the Atlantic coast provide rare insights into deeply buried rock units that have no surface exposures. Data for each borehole include the state, a unique identifier (Well_ID), any alternate identifier(s) (Alt_ID), borehole name or location, year drilled, land surface elevation in feet, top-of-basement depth in feet, total depth of borehole in feet, top-of-basement elevation in feet, basement penetrated by drilling in feet, depth reference (ground level, Kelly bushing, or derrick floor), lithology code, basement type, quality of lithologic data, description of pre-Cretaceous basement rock, sample (drill core or cuttings), latitude and longitude (NAD27), county or city, and reference citations. The data in comma separated values (.csv) format are accompanied by an explanation (.txt), references (.txt), and metadata (.xml). The data file uses standard abbreviations for mineral names where necessary to save space.

This data release contains whole-rock geochemical analyses from drill cores and cuttings of pre-Middle Jurassic basement rocks that are buried beneath Coastal Plain sedimentary deposits in Florida and Alabama. The analyses were acquired to support geologic mapping and characterization of little-known coastal-plain basement rock units for topical studies as in geochronology, and applications ranging from mineral, energy, and water resources to earthquake hazards. These samples provide rare insights into deeply buried rocks that have no surface exposures and no known exposed correlates. The 70 whole-rock samples from drill cores and cuttings were selected and described by Ryan Deasy (USGS) and analyzed for major and trace elements at Activation Laboratories Ltd. (Actlabs) in Ancaster, Ontario, Canada. Analytical methods included lithium borate fusion or multiacid digestion followed by inductively coupled plasma optical emission spectroscopy (ICP-OES) for major elements and inductively coupled plasma mass spectrometry (ICP-MS) for most trace elements. Additional analytical methods included instrumental neutron activation analysis (INAA) for other trace elements, and loss on ignition (LOI) by gravimetric methods. Sample information (location, depth, brief description, etc.) and geochemical data in comma separated values (.csv) format are accompanied by quality control (QC) data (.csv), a data dictionary (.csv), and metadata (.xml). Mineral abundances, determined by application of the Rietveld method to whole-rock powder X-ray diffraction data, of many of the same samples are available in a companion data release (Deasy and others, 2024a). Photographs and photomicrographs of all samples are presented in another companion data release (Deasy and others, 2024b). These data were collected to support the characterization, discrimination, and correlation of map units in the Geologic map of pre-Middle Jurassic basement rocks beneath the Coastal Plain in Florida (Deasy and others, 2024c). Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

This data release contains whole-rock geochemical analyses from drill cores and cuttings of pre-Middle Jurassic basement rocks that are buried beneath Coastal Plain sedimentary deposits in Florida and Alabama. The analyses were acquired to support geologic mapping and characterization of little-known coastal-plain basement rock units for topical studies as in geochronology, and applications ranging from mineral, energy, and water resources to earthquake hazards. These samples provide rare insights into deeply buried rocks that have no surface exposures and no known exposed correlates. The 70 whole-rock samples from drill cores and cuttings were selected and described by Ryan Deasy (USGS) and analyzed for major and trace elements at Activation Laboratories Ltd. (Actlabs) in Ancaster, Ontario, Canada. Analytical methods included lithium borate fusion or multiacid digestion followed by inductively coupled plasma optical emission spectroscopy (ICP-OES) for major elements and inductively coupled plasma mass spectrometry (ICP-MS) for most trace elements. Additional analytical methods included instrumental neutron activation analysis (INAA) for other trace elements, and loss on ignition (LOI) by gravimetric methods. Sample information (location, depth, brief description, etc.) and geochemical data in comma separated values (.csv) format are accompanied by quality control (QC) data (.csv), a data dictionary (.csv), and metadata (.xml). Mineral abundances, determined by application of the Rietveld method to whole-rock powder X-ray diffraction data, of many of the same samples are available in a companion data release (Deasy and others, 2024a). Photographs and photomicrographs of all samples are presented in another companion data release (Deasy and others, 2024b). These data were collected to support the characterization, discrimination, and correlation of map units in the Geologic map of pre-Middle Jurassic basement rocks beneath the Coastal Plain in Florida (Deasy and others, 2024c). Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

This data release reports the mineral abundances in samples of pre-Middle Jurassic basement rocks from twenty-nine (29) boreholes in Florida and southern Alabama. Mineral abundances are quantified from whole-rock powder X-ray diffraction (XRD) data and the Rietveld method and are reported in weight percent or, where present near the detection limit (~1 wt.% depending on mineral), as trace (t). The abundances of expandable clays are given in weight percent in corundum-spiked samples and qualitatively in EG-solvated samples as absent (0), trace (t), present (p), or abundant (a). Accessory minerals identified by optical and/or electron microscopy but not detected in XRD patterns are named but not quantified. Major and trace element geochemical analyses of many of the same samples are available in a companion data release (Deasy and others, 2024a). Raw diffraction intensity data are included in original proprietary formats as well as in converted .csv files. More information about samples and XRD methods and results are included in the accompanying Data Report entitled Petrography and mineralogy of selected pre-Middle Jurassic basement rocks beneath the Atlantic and Gulf Coastal Plains in Florida (Deasy and others, 2024b). Photographs and photomicrographs of all samples are presented in another companion data release (Deasy and others, 2024c). These data were collected to support the characterization, discrimination, and correlation of map units in the Geologic map of pre-Middle Jurassic basement rocks beneath the Atlantic and Gulf Coastal Plains in Florida (Deasy and others, 2024d). This data release contains the following files: DATA_FL-AL_basement_rock_mineral_abundances.csv contains the estimated mineral abundances in eighty-one (81) samples from twenty-nine (29) wells, well identification information and sample depths, trace minerals identified by optical or electron microscopy, results of ethylene glycol (EG) solvation treatments as applicable, angular range of analysis in degrees 2-theta, sample mount types used, modeled mineral compositions as applicable, and optional additional comments. DATA_DICTIONARY_FL-AL_basement_rock_mineral_abundances.csv contains definitions of attributes in the data file. OTHER_ABBREVIATIONS_FL-AL_basement_rock_mineral_abundances.csv lists and defines abbreviations used in this data release. Raw XRD are grouped in a folder (rawXRDdata). Original XRD data, in .xrdml and .raw formats are in three (3) subfolders (rawXRDdata_1, rawXRDdata_2, and rawXRDdata_3) grouped by “data_source” (that is, laboratory in and instrument on which analyses were performed). Diffraction intensity data in .csv format are also included in compiled spreadsheets grouped by “data_source” (rawXRDdata_1.csv, rawXRDdata_2.csv, and rawXRDdata_3.csv). Conversion from original to .csv format was performed with PowDLL Converter v2.7. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

This data release reports the mineral abundances in samples of pre-Middle Jurassic basement rocks from twenty-nine (29) boreholes in Florida and southern Alabama. Mineral abundances are quantified from whole-rock powder X-ray diffraction (XRD) data and the Rietveld method and are reported in weight percent or, where present near the detection limit (~1 wt.% depending on mineral), as trace (t). The abundances of expandable clays are given in weight percent in corundum-spiked samples and qualitatively in EG-solvated samples as absent (0), trace (t), present (p), or abundant (a). Accessory minerals identified by optical and/or electron microscopy but not detected in XRD patterns are named but not quantified. Major and trace element geochemical analyses of many of the same samples are available in a companion data release (Deasy and others, 2024a). Raw diffraction intensity data are included in original proprietary formats as well as in converted .csv files. More information about samples and XRD methods and results are included in the accompanying Data Report entitled Petrography and mineralogy of selected pre-Middle Jurassic basement rocks beneath the Atlantic and Gulf Coastal Plains in Florida (Deasy and others, 2024b). Photographs and photomicrographs of all samples are presented in another companion data release (Deasy and others, 2024c). These data were collected to support the characterization, discrimination, and correlation of map units in the Geologic map of pre-Middle Jurassic basement rocks beneath the Atlantic and Gulf Coastal Plains in Florida (Deasy and others, 2024d). This data release contains the following files: DATA_FL-AL_basement_rock_mineral_abundances.csv contains the estimated mineral abundances in eighty-one (81) samples from twenty-nine (29) wells, well identification information and sample depths, trace minerals identified by optical or electron microscopy, results of ethylene glycol (EG) solvation treatments as applicable, angular range of analysis in degrees 2-theta, sample mount types used, modeled mineral compositions as applicable, and optional additional comments. DATA_DICTIONARY_FL-AL_basement_rock_mineral_abundances.csv contains definitions of attributes in the data file. OTHER_ABBREVIATIONS_FL-AL_basement_rock_mineral_abundances.csv lists and defines abbreviations used in this data release. Raw XRD are grouped in a folder (rawXRDdata). Original XRD data, in .xrdml and .raw formats are in three (3) subfolders (rawXRDdata_1, rawXRDdata_2, and rawXRDdata_3) grouped by “data_source” (that is, laboratory in and instrument on which analyses were performed). Diffraction intensity data in .csv format are also included in compiled spreadsheets grouped by “data_source” (rawXRDdata_1.csv, rawXRDdata_2.csv, and rawXRDdata_3.csv). Conversion from original to .csv format was performed with PowDLL Converter v2.7. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

This dataset captures in digital form the results of previously published U.S. Geological Survey (USGS) Water Mission Area studies related to water resource assessment of Cenozoic strata and unconsolidated deposits within the Mississippi Embayment and the Gulf Coastal Plain of the south-central United States. The data are from reports published from the late 1980s to the mid-1990s by the Gulf Coast Regional Aquifer-System Analysis (RASA) studies and in 2008 by the Mississippi Embayment Regional Aquifer Study (MERAS). These studies, and the data presented here, describe the geologic and hydrogeologic units of the Mississippi embayment, Texas coastal uplands, and the coastal lowlands aquifer systems, south-central United States. This dataset supercedes a previously released dataset on USGS ScienceBase (https://doi.org/10.5066/P9JOHHO6) that was found to contain errors. Following initial release of data, several types of errors were recognized in the well downhole stratigraphic data. Most of these errors were the result of unrecognized improper results in the optical character recognition conversion from the original source report. All downhole data have been thoroughly checked and corrected, data tables were revised, and new point feature classes were created for well location and WellHydrogeologicUnit. GIS data related to the geologic map and subsurface contours were correct in original release and are retained here in original form; only the well data have been revised from the initial data release. The Mississippi embayment, Texas coastal uplands, and coastal lowlands aquifer systems underlie about 487,000 km2 in parts of Alabama, Arkansas, Florida, Illinois, Kentucky, Louisiana, Mississippi, Missouri, Tennessee, and Texas from the Rio Grande on the west to the western part of Florida on the east. The previously published investigations divided the Cenozoic strata and unconsolidated deposits within the Mississippi Embayment and the Gulf Coastal Plain into 11 major geologic units, typically mapped at the group level, with several additional units at the formational level, which were aggregated into six hydrogeologic units within the Mississippi embayment and Texas coastal uplands and into five hydrogeologic units within the Coastal Lowlands aquifer system. These units include the Mississippi River Valley alluvial aquifer, Vicksburg-Jackson confining unit (contained within the Jackson Group), the upper Claiborne aquifer (contained within the Claiborne Group), the middle Claiborne confining unit (contained within the Claiborne Group), the middle Claiborne aquifer (contained within the Claiborne Group), the lower Claiborne confining unit (contained within the Claiborne Group), the lower Claiborne aquifer (contained within the Claiborne Group), the middle Wilcox aquifer (contained within the Wilcox Group), the lower Wilcox aquifer (contained within the Wilcox Group), and the Midway confining unit (contained within the Midway Group). This dataset includes structure contour and thickness data digitized from plates in two reports, borehole data compiled from two reports, and a geologic map digitized from a report plate. Structure contour and thickness maps of hydrogeologic units in the Mississippi Embayment and Texas coastal uplands had been previously digitized by a USGS study from georeferenced images of altitude and thickness contours in USGS Professional Paper 1416-B (Hosman and Weiss, 1991). These data, which were stored on the USGS Water Mission Area’s NSDI node, were downloaded, reformatted, and attributed for present dataset. Structure contour maps of geologic units in the Mississippi Embayment and Texas coastal uplands were digitized and attributed from georeferenced images of altitude and thickness contours in USGS Professional Paper 1416-G (Hosman, 1996) for this data release. Borehole data in this data release include data compiled for USGS Gulf Coast RASA studies in which a scanned version of a USGS report (Wilson and

This dataset captures in digital form the results of previously published U.S. Geological Survey (USGS) Water Mission Area studies related to water resource assessment of Cenozoic strata and unconsolidated deposits within the Mississippi Embayment and the Gulf Coastal Plain of the south-central United States. The data are from reports published from the late 1980s to the mid-1990s by the Gulf Coast Regional Aquifer-System Analysis (RASA) studies and in 2008 by the Mississippi Embayment Regional Aquifer Study (MERAS). These studies, and the data presented here, describe the geologic and hydrogeologic units of the Mississippi embayment, Texas coastal uplands, and the coastal lowlands aquifer systems, south-central United States. This dataset supercedes a previously released dataset on USGS ScienceBase (https://doi.org/10.5066/P9JOHHO6) that was found to contain errors. Following initial release of data, several types of errors were recognized in the well downhole stratigraphic data. Most of these errors were the result of unrecognized improper results in the optical character recognition conversion from the original source report. All downhole data have been thoroughly checked and corrected, data tables were revised, and new point feature classes were created for well location and WellHydrogeologicUnit. GIS data related to the geologic map and subsurface contours were correct in original release and are retained here in original form; only the well data have been revised from the initial data release. The Mississippi embayment, Texas coastal uplands, and coastal lowlands aquifer systems underlie about 487,000 km2 in parts of Alabama, Arkansas, Florida, Illinois, Kentucky, Louisiana, Mississippi, Missouri, Tennessee, and Texas from the Rio Grande on the west to the western part of Florida on the east. The previously published investigations divided the Cenozoic strata and unconsolidated deposits within the Mississippi Embayment and the Gulf Coastal Plain into 11 major geologic units, typically mapped at the group level, with several additional units at the formational level, which were aggregated into six hydrogeologic units within the Mississippi embayment and Texas coastal uplands and into five hydrogeologic units within the Coastal Lowlands aquifer system. These units include the Mississippi River Valley alluvial aquifer, Vicksburg-Jackson confining unit (contained within the Jackson Group), the upper Claiborne aquifer (contained within the Claiborne Group), the middle Claiborne confining unit (contained within the Claiborne Group), the middle Claiborne aquifer (contained within the Claiborne Group), the lower Claiborne confining unit (contained within the Claiborne Group), the lower Claiborne aquifer (contained within the Claiborne Group), the middle Wilcox aquifer (contained within the Wilcox Group), the lower Wilcox aquifer (contained within the Wilcox Group), and the Midway confining unit (contained within the Midway Group). This dataset includes structure contour and thickness data digitized from plates in two reports, borehole data compiled from two reports, and a geologic map digitized from a report plate. Structure contour and thickness maps of hydrogeologic units in the Mississippi Embayment and Texas coastal uplands had been previously digitized by a USGS study from georeferenced images of altitude and thickness contours in USGS Professional Paper 1416-B (Hosman and Weiss, 1991). These data, which were stored on the USGS Water Mission Area’s NSDI node, were downloaded, reformatted, and attributed for present dataset. Structure contour maps of geologic units in the Mississippi Embayment and Texas coastal uplands were digitized and attributed from georeferenced images of altitude and thickness contours in USGS Professional Paper 1416-G (Hosman, 1996) for this data release. Borehole data in this data release include data compiled for USGS Gulf Coast RASA studies in which a scanned version of a USGS report (Wilson and

The data set contains location, depth, and geologic data from drill holes penetrating the Paleocene Fort Union Formation in the Williston Basin in Mercer and Oliver Counties in central North Dakota.

The data set contains location, depth, and geologic data from drill holes penetrating the Paleocene Fort Union Formation in the Williston Basin in Mercer and Oliver Counties in central North Dakota.