U.S. Geological Survey 20150304 vector digital data Reston, Virginia U.S. Geological Survey https://water.usgs.gov/lookup/getspatial?ds926_fig43_top_Bucatunna_regions U.S. Geological Survey 20150304 Publication U.S. Geological Survey Data Series 926 Reston, Virginia U.S. Geological Survey https://pubs.usgs.gov/ds/0926/ Digital surfaces and thicknesses of selected hydrogeologic units of the Floridan aquifer system were developed to define an updated hydrogeologic framework as part of the U.S. Geological Survey Groundwater Resources Program. This feature class contains a polygon representing the extent of the Bucatunna clay confining unit. Used to clip contours and rasters of this unit. The dataset contains structural surfaces depicting the top and base of the aquifer system, its major and minor hydrogeologic units and zones, geophysical marker horizons, and the altitude of the 10,000-milligram-per-liter total dissolved solids boundary that defines the approximate fresh and saline parts of the aquifer system. The thicknesses of selected major and minor units or zones were determined by interpolating points of known thickness or from raster surface subtraction of the structural surfaces. Additional data contained include clipping polygons; regional polygon features that represent geologic or hydrogeologic aspects of the aquifers and the minor units or zones; data points used in the interpolation; and polygon and line features that represent faults, boundaries, and other features in the aquifer system. Shows the extent of the Bucatunna clay confining unit. 19400101 010000 20130101 010000 Temporal Period Extent: 1940-2013 Complete None planned -88.487643 -84.339927 31.939652 29.494306 USGS Thesaurus Hydrogeology Stratigraphy Floridan aquifer system Geology Regional Groundwater Availability Study USGS United States Geological Survey extent top confining unit clay Bucatunna inlandWaters ISO 19115 Topic Categories environment geoscientificInformation inlandWaters USGS Metadata Identifier USGS:7248751a-16ee-480c-9ea6-794b8f7789c8 Geographic Names Information System Florida Georgia Alabama South Carolina None None. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data. U.S. Geological Survey Joann Dixon IT Specialist mailing address

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Lutz FL 33559 USA 407-803-5533 jdixon@usgs.gov https://water.usgs.gov/GIS/browse/ds926_fig43.jpg Bucatunna clay confining unit jpg Williams and Kuniansky, 2015, Revised Hydrogeologic Framework of the Floridan aquifer system in Florida and Parts of Georgia, Alabama, and South Carolina, U.S. Geological Survey Professional Paper 1807. Report available from: https://pubs.usgs.gov/pp/1807/ or http://doi.org/10.3133/pp1807 None Unclassified None Environment as of Metadata Creation: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.2.2 (Build 3552) Service Pack N/A (Build N/A) U.S. Geological Survey 1999 map Principal aquifers of the United States (modified from Principal Aquifers, U.S. Geological Survey, 2003). National Atlas product Reston, VA U.S. Geological Survey https://water.usgs.gov/GIS/dsdl/USAaquiferMAP11_17.pdf U.S. Geological Survey 1989 map Hydrologic Investigations Atlas HA 730 Reston, VA U.S. Geological Survey, Water Resources Division https://pubs.usgs.gov/ha/ha730/index.html Attributes added by the data-set author were checked routinely by inspection using queries, hardcopy printouts, and visually using a GIS. In addition, attributes were checked and evaluated as part of the review process associated with the publication of the source report (Larger Work Citation). All data were visually evaluated and reviewed to be hydrologically consistent and correct. Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. A formal accuracy assessment of the horizontal positional information in the data set has not been conducted. A formal accuracy assessment of the vertical positional information in the data set has either not been conducted, or is not applicable. Lester J. Williams Eve L. Kuniansky 2015 publication Professional Paper 1807 Reston, VA U.S. Geological Survey https://pubs.usgs.gov/pp/1807/ online publication 2015 Publication date Professional Paper 1807 Used in association with the revised Hydrogeologic Framework of the Floridan Aquifer System Structural surfaces and thicknesses of hydrogeologic units were interpolated from scattered data points compiled mostly from correlation of geophysical and lithologic logs and data from published reports. Log measuring points were determined from information provided in the log header, digital elevation models (DEMs), the USGS National Water Information System (http://waterdata.usgs.gov/nwis/), or from digital data provided by State agencies. The depth to the top of each hydrogeologic unit was determined mostly by correlating known geophysical log response or from lithologic and available paleontological reports. Altitudes of hydrogeologic units were calculated by subtracting the depth to the top of the unit determined on the geophysical or lithologic log from the measuring point. All of the structural surfaces and two of the thickness rasters were interpolated from scattered data points using the Australian National University Digital Elevation Model method on a 1,000×1,000-meter (m) grid (Hutchinson, 1988, 1989) as implemented in ArcGIS version 9. This method can produce areas higher or lower than the data point because local trends are taken into account during the interpolation process. The differences between actual and interpolated values determined using the Australian National University Digital Elevation Model method are summarized in Table 1 - https://pubs.usgs.gov/pp/1807/pdf/pp1807.pdf. Minimum and maximum residuals were mainly located in the outcrop areas of the aquifer and around features such as the Gulf Trough in Georgia where abrupt changes in altitude over short distances caused some higher minimum and maximum differences as a result of the averaging of values that occurs across 1,000×1,000-m grid cells. Actual values within 5 feet (ft) of the corresponding interpolated digital hydrogeologic surface ranged from 77 to 97percent of the total number of values for all surfaces (Fig. 3 - https://pubs.usgs.gov/pp/1807/pdf/pp1807.pdf). The latitude and longitude of each point (well or test boring) is derived from a variety of sources including Florida's water management districts, Florida Geological Survey, Georgia EPD, South Carolina DHEC, and files and databases of the USGS. The point feature classes were generated by using the Create feature from x,y table in ArcGIS. 20150308 Vector GT-polygon composed of chains 2 NAD 1983 Albers 29.5 45.5 -84.0 23.0 0.0 0.0 coordinate pair 0.0001 0.0001 meter D North American 1983 GRS 1980 6378137.0 298.257222101 ds926_fig43_top_Bucatunna_regions Clipping boundary extent for the Bucatunna clay confining unit USGS OBJECTID Internal feature number. Esri Sequential unique whole numbers that are automatically generated. Shape Feature geometry. Esri Coordinates defining the features. MCU_ID Middle confining unit ID based on Miller (1986) USGS V Shape_Leng Length of feature in internal units. Esri Positive real numbers that are automatically generated. Shape_Length Length of feature in internal units. Esri Positive real numbers that are automatically generated. Shape_Area Area of feature in internal units squared. Esri Positive real numbers that are automatically generated. descrip Description of region USGS Description of Regions U.S. Geological Survey Michael Ierardi IT Specialist mailing and physical

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Reston Virginia 20192 USA 1-888-275-8747 (1-888-ASK-USGS) mierardi@usgs.gov Downloadable Data Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data, software, or related materials. The use of firm, trade, or brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. The names mentioned in this document may be trademarks or registered trademarks of their respective trademark owners. File Geodatabase Feature Class Online accessible data downloadable data zipped 68800 https://water.usgs.gov/GIS/dsdl/ds926_gdb.zip Shape File Online accessible data downloadable data zipped 84500 https://water.usgs.gov/GIS/dsdl/ds926_shapefiles.zip ARC export Online accessible data WinZip compressed file 21600 https://water.usgs.gov/GIS/dsdl/ds926_ASCII_rasters.zip None. No fees are applicable for obtaining the data set. 20201117 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) mierardi@usgs.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998