Diana E. Pedraza Allan K. Clark Robert E. Morris 20200921 vector digital data Denver, Colo. U.S. Geological Survey In cooperation with the Edwards Aquifer Authority https://doi.org/10.5066/P9HHMBX8 Allan K. Clark Robert E. Morris Diana E. Pedraza 2020 publication Scientific Investigations Map 3461 Reston, Va. U.S. Geological Survey In cooperation with the Edwards Aquifer Authority https://doi.org/10.3133/sim3461 This data release supports the U.S. Geological Survey Scientific Investigation Map (SIM) by Clark and others (2020) by documenting the data used to create the geologic maps and describe geologic framework and hydrostratigraphy of the Edwards and Trinity aquifers for a 442 square-mile area in northern Medina County in south Texas. The karstic Edwards and Trinity aquifers that are the subject of the SIM by Clark and others (2020) are classified as major sources of water in south-central Texas by the Texas Water Development Board (George and others, 2011). The geologic framework and hydrostratigraphy of the Edwards and Trinity aquifers largely control groundwater-flow paths and storage in northern Medina County (Kuniasky and Ardis, 2004). The data provided in this data release and the detailed maps and descriptions of the geologic framework and hydrostratigraphy in Clark and others (2020) are intended to help provide water managers information that is useful for effectively managing available groundwater resources in the study area. These digital data accompany Clark, A.K., Morris, R.E., and Pedraza, D.E., 2020, Geologic framework and hydrostratigraphy of the Edwards and Trinity aquifers within northern Medina County, Texas: U.S. Geological Survey Scientific Investigations Map 3461, 13 p. pamphlet, 1 pl., scale 1:24,000, https://doi.org/10.3133/sim3461. This geospatial dataset was created to provide a detailed digital dataset, as well as to illustrate the geographical extent of the geologic framework and hydrostratigraphy for the Edwards and Trinity aquifers in a 442 square mile area of northern Medina County in south Texas. References listed in abstract: George, P.G., Mace, R.E., and Petrossian, R., 2011, Aquifers of Texas: Texas Water Development Board Report 380, 172 p., accessed July 25, 2018, at https://www.twdb.texas.gov/publications/reports/numbered_reports/doc/R380_AquifersofTexas.pdf?d=23236.398949342703. Kuniasky, E.L., and Ardis, A.F., 2004, Hydrogeology and ground-water flow in the Edwards-Trinity aquifer system, west-central Texas—Regional aquifer-system analysis—Edwards-Trinity: U.S. Geological Survey Professional Paper 1421 C, 78 p., at https://doi.org/10.3133/pp1421C. 20181001 20200930 publication date Complete None planned -99.4137 -98.8052 29.6908 29.3935 ISO 19115 Topic Category geoscientificInformation None Austin Group Devils River Limestone Devils River Trend Eagle Ford Group Edwards aquifer Edwards Group Glen Rose Limestone Haby Crossing fault hydrostratigraphy Kainer Formation Maverick Basin Medina Lake fault Parker Creek fault Person Formation San Marcos Platform Taylor Group Trinity aquifer Trinity group Washita Group Woodard Cave fault USGS Thesaurus digitization geospatial datasets geologic maps geography geology hydrogeology stratigraphy geologic contacts surficial geologic units stratigraphic thickness porosity groundwater karst USGS Metadata Identifier USGS:5eab03d582cefae35a2254b1 U.S. Board on Geographic Names (BGN) Diversion Lake Hondo Hondo Creek Medina County Medina Lake Medina River Seco Creek Verde Creek Texas None. Users of these data are advised to read all metadata and associated documentation thoroughly to understand appropriate use and data limitations. Publication Information Officer U.S. Geological Survey mailing and physical

1505 Ferguson Lane

Austin TX 78754 US 512-927-3500 gs-w-txpublicinfo@usgs.gov Version 6.2 (Build 9200); Esri ArcGIS 10.7.1.11595 Data were collected in the field with the use of handheld global positioning system (gps) enabled devices. While in the field, mapping attributes were tagged to the waypoints. Authors have reviewed the attributes for accuracy and completeness through the use of on screen data selections and/or queries. Newly mapped data and their associated attributes were compared against previously published mapping reports that were located in and around the study boundary. Map elements were visually checked for overshoots, undershoots, duplicate features, and other errors. ArcGIS software was used to create topological relationships among features. Features were not duplicated, but coincident lines may exist between data layers where appropriate. Newly mapped hydrostratigraphic units were field mapped and digitized at appropriate resolution for portrayal at a 1:24,000 scale. Data are complete; no features were eliminated or generalized. The hydrostratigraphic map unit properties are described in the companion Scientific Investigations Map 3461. Ted A. Small Allan K. Clark 2000 publication Water-Resources Investigations Report 00-4195 Austin, Texas U.S. Geological Survey In cooperation with Edwards Aquifer Authority https://doi.org/10.3133/wri004195 24000 Digital and/or Hardcopy 2000 publication date Small and Clark, 2000 geologic map; hydrogeologic function Charles D. Blome Jason R. Faith Diana E. Pedraza George B. Ozuna James C. Cole Allan K. Clark Ted A. Small Robert R. Morris 2005 1.1 vector digital data Scientific Investigations Map 2873 Reston, Va. U.S. Geological Survey In cooperation with the National Cooperative Geologic Mapping Program https://doi.org/10.3133/sim2873 200000 Digital and/or Hardcopy 1994 2003 publication date Blome and others, 2005 geologic digital dataset Allan K. Clark Celeste A. Journey 2006 publication Scientific Investigations Report 2006-5200 Reston, Va. U.S. Geological Survey In cooperation with the San Antonio Water System https://doi.org/10.3133/sir20065200 24000 Digital and/or Hardcopy 2006 publication date Clark and Journey, 2006 geologic map Allan K. Clark Jason R. Faith Charles D. Blome Diana E. Pedraza 2006 publication Open-File Report 2006-1372 Reston, Va. U.S. Geological Survey In cooperation with San Antonio Water System and the National Cooperative Geologic Mapping Program https://doi.org/10.3133/ofr20061372 75000 Digital and/or Hardcopy 2006 publication date Clark and others, 2006 geologic map Allan K. Clark Diana E. Pedraza Robert R. Morris 2013 publication Scientific Investigations Report 2013-5149 Reston, Va. U.S. Geological Survey In cooperation with the U.S. Army Corps of Engineers https://doi.org/10.3133/sir20135149 24000 Digital and/or Hardcopy 2013 publication date Clark and others, 2013 geologic map William G. Stein George B. Ozuna 1995 publication Water-Resources Investigations Report 95-4030 Austin, TX U.S. Geological Survey In cooperation with the San Antonio Water System https://doi.org/10.3133/wri954030 75000 Digital and/or Hardcopy 1995 publication date Stein and Ozuna, 1995 geologic and hydrostratigraphic unit descriptions; hydrogeologic function Allan K. Clark 2003 publication Water-Resources Investigations Report 03-4081 Austin, TX U.S. Geological Survey In cooperation with the U.S. Army https://doi.org/10.3133/wri034081 Digital and/or Hardcopy 2003 publication date Clark, 2003 geologic and hydrostratigraphic unit descriptions; hydrogeologic function; thickness Amy R. Clark Charles D. Blome Jason R. Faith 2009 publication Open-File Report 09-1008 Reston, Va. U.S. Geological Survey https://doi.org/10.3133/ofr20091008 50000 Digital and/or Hardcopy 2003 2008 publication date Clark and others, 2009 geologic and hydrostratigraphic unit descriptions; hydrogeologic function; thickness Charles D. Blome Allan K. Clark 2014 publication Data Series 768 Denver, Colo. U.S. Geological Survey In cooperation with Camp Stanley Storage Activity, Parsons Corporation, and Weatherford Laboratories https://dx.doi.org/10.3133/ds768 24000 Digital and/or Hardcopy 2014 publication date Blome and Clark, 2014 Descriptions of geologic and hydrostratigraphic units Allan K. Clark James A. Golab Robert E. Morris 2016 1.1 publication Scientific Investigations Map 3363 Reston, Va. U.S. Geological Survey https://doi.org/10.3133/sim3363 24000 Digital and/or Hardcopy 2016 publication date Clark and others, 2016a Descriptions of geologic and hydrostratigraphic units Allan K. Clark James A. Golab Robert R. Morris 2016 publication Scientific Investigations Map 3366 Reston, Va. U.S. Geological Survey In cooperation with the Edwards Aquifer Authority https://doi.org/10.3133/sim3366 Digital and/or Hardcopy 2016 publication date Clark and others, 2016b geologic and hydrostratigraphic unit descriptions; hydrogeologic functions; thickness P.W. Choquette L.C. Pray 19700201 publication American Association of Petroleum Geologists Bulletin v. 54 no. 2 p. 207-250 https://doi.org/10.1306/5D25C98B-16C1-11D7-8645000102C1865D Digital and/or Hardcopy 1970 publication date Choquette and Pray, 1970 porosity types Robert W. Maclay Ted A. Small 1976 publication Open-File Report 76-627 Reston, Va. U.S. Geological Survey https://doi.org/10.3133/ofr76627 Digital and/or Hardcopy 1976 publication date Maclay and Small, 1976 hydrologic unit John B. Ashworth 1983 publication Texas Department of Water Resources Report 273 Austin, TX Texas Department of Water Resources https://www.twdb.texas.gov/publications/reports/numbered_reports/doc/R273/Rpt273.pdf Digital and/or Hardcopy 1983 publication date Ashworth, 1983 hydrologic function F. Roemer 1852 publication Bonn, Germany Adolph Marcus Publishing https://doi.org/10.5962/bhl.title.15015 Digital and/or Hardcopy 1852 publication date Roemer, 1852 Orbitolina texana Raymond C. Douglas 1960 publication Professional Paper 333 Washington, D.C. U.S. Geological Survey https://doi.org/10.3133/pp333 Digital and/or Hardcopy 1960 publication date Douglas, 1960 Orbitolina minuta B.F. Shumard 1860 publication Transactions v. 1 St. Louis, MO Academy of Science of St. Louis Digital and/or Hardcopy 1860 publication date Shumard, 1860 group, formation, and members R.T. Hill 1887 publication 3rd Series v. 33, no. 196 New Haven, CT American Journal of Science Digital and/or Hardcopy 1887 publication date Hill, 1887 group, formation, and members R.T. Hill 1888 publication None v. 11, Issue 258 Unknown Science https://doi.org/10.1126/science.ns-11.258.21 Digital and/or Hardcopy 1888 publication date Hill, 1888 group, formation, and members R.T. Hill 1891 publication Bulletin 2 Unknown Geological Society of America Pgs. 503-528 https://doi.org/10.1130/GSAB-2-503 Digital and/or Hardcopy 1891 publication date Hill, 1891 group, formation, and members R.T. Hill 1892 publication None vol. 10, no. 2 Minneapolis, MN The American Geologist Digital and/or Hardcopy 1892 publication date Hill, 1892 group, formation, and members R.T. Hill T.W. Vaughan 1898 publication Annual Report 19 Washington, D.C. U.S. Geological Survey https://doi.org/10.3133/ar18 Digital and/or Hardcopy 1898 publication date Hill and Vaughan, 1898 group, formation, and members T.W. Vaughan 1900 publication Geologic Atlas of the United States Folio GF-64 Washington, D.C. U.S. Geological Survey https://doi.org/10.3133/gf64 Digital and/or Hardcopy 1900 publication date Vaughan, 1900a group, formation, and members T.W. Vaughan 1900 publication Bulletin 164 Washington, D.C. U.S. Geological Survey https://doi.org/10.3133/b164 Digital and/or Hardcopy 1900 publication date Vaughan, 1900b group, formation, and members J.A. Udden 1907 tabular digital data Publication 6 Rock Island, Illinois Augustana Library Digital and/or Hardcopy 1907 publication date Udden, 1907 group, formation, and members W.C. Adkins 1932 publication Bulletin 3232 Austin, TX University of Texas https://repositories.lib.utexas.edu/handle/2152/24040 Digital and/or Hardcopy 1932 publication date Adkins, 1932 group, formation, and members H.B. Stenzel 1938 publication PB 3818D Austin, TX The University of Texas https://repositories.lib.utexas.edu/handle/2152/27652 Digital and/or Hardcopy 1938 publication date Stenzel, 1938 group, formation, and members M.G. Wilmarth 1938 publication Bulletin 896 Washington, D.C. U.S. Geological Survey https://doi.org/10.3133/b896 Digital and/or Hardcopy 1938 publication date Wilmarth, 1938 group, formation, and members R.T. Hazzard 1939 publication Digital and/or Hardcopy 1939 publication date Hazzard, 1939 group, formation, and members C.P. Ross 1943 publication Bulletin 928-B Washington, D.C. U.S. Geological Survey https://doi.org/10.3133/b928B Digital and/or Hardcopy 1943 publication date Ross, 1943 group, formation, and members F.E. Lozo F.L. Stricklin, Jr. 1956 publication Transactions v. 6 Unknown Gulf Coast Association of Geological Societies Digital and/or Hardcopy 1956 publication date Lozo and Stricklin, 1956 group, formation, and members F.L. Stricklin C.I. Smith F.E. Lozo 1971 publication Report of Investigations v. 71 Austin, TX Bureau of Economic Geology Digital and/or Hardcopy 1971 publication date Stricklin and others, 1971 group, formation, and members P.R. Rose 1972 publication Report of Investigations 74 Austin, Texas The University of Texas https://doi.org/10.23867/RI0074D Digital and/or Hardcopy 1972 publication date Rose, 1972 group, formation, and members R.F. Inden 1974 publication None v. 8 Baton Rouge, LA Louisiana State University Geoscience and Man Digital and/or Hardcopy 1974 publication date Inden, 1974 group, formation, and members B.F. Perkins 1974 publication None v. 8 Baton Rouge, LA Louisiana State University Geoscience and Man Digital and/or Hardcopy 1974 publication date Perkins, 1974 group, formation, and members U.S. Geological Survey 2018 application/service Reston, Va. U.S. Geological Survey Online database http://ngmdb.usgs.gov/Geolex/search Digital and/or Hardcopy 2018 publication date U.S. Geological Survey, 2018 group, formation, and members R.W. Maclay T.A. Small 1983 publication Journal of Hydrology v 61 unknown Elsevier Pages 127-146 https://doi.org/10.1016/0022-1694(83)90239-1 Digital and/or Hardcopy 1983 publication date Maclay and Small, 1983 BRB description for field identification R.J. Dunham 19620101 publication Memoir 1 Vol. 1 Unknown American Association of Petroleum Geologists American Association of Petroleum Geologists Memoir 1, p. 108-121 https://doi.org/10.1306/M1357 Digital and/or Hardcopy 1962 publication date Dunham, 1962 carbonate classification V.P. Wright 1992 publication Sedimentary Geology v. 76, no. 3-4 unknown Elsevier https://doi.org/10.1016/0037-0738(92)90082-3 Digital and/or Hardcopy 1992 publication date Wright, 1992 carbonate classification U.S. Geological Survey 2020 raster digital data Reston, Va. U.S. Geological Survey https://www.usgs.gov/news/historical-maps-your-fingertips https://ngmdb.usgs.gov/topoview/ 24000 Digital and/or Hardcopy 1958 1970 publication date USGS, 2020 7.5-minute quadrangles: Seco Pass 1964 (1968 ed.), Flatrock Crossing 1969 (1982 ed.), Comanche Waterhole 1969 (1972 ed.), Tarpley 1964 (1968 ed.), Texas Mountain 1964 (1972 ed.), Sabinal NE 1969 (1992 ed.), Twin Hollow 1969 (1992 ed.), Mustang Valley 1969 (1992 ed.), Timber Creek 1964 (1967 ed.), Quihi 1969 (1991 ed.), Medina Lake 1964 (1982 ed.), Riomedina 1964 (1982 ed.), Jack Mountain 1970 (1982 ed.), San Geronimo 1970 (1983 ed.), and La Coste NE 1958 (1982 ed.) Texas Natural Resources Information System 1999 vector digital data Austin, TX Texas Natural Resources Information System https://data.tnris.org/ 24000 Digital and/or Hardcopy 1999 publication date TNRIS, 1999 Elevation contours R.A. Liddle 19181025 publication University of Texas Bulletin No. 1860 Austin, Tex. University of Texas http://hdl.handle.net/2152/23691 Digital and/or Hardcopy 19181025 publication date Liddle, 1918 Igneous intrusive rocks Geologic data and information from previously published reports were reviewed to assist in field mapping efforts. If the report had an associated digital dataset that was in or around the study boundary, the data were brought into a Geographical Information System (GIS) and plotted against digital U.S. Geological Survey 7.5-minute topographic quadrangles for review and analysis. Data that plotted along the borders of the study boundary were used to help guide the edge matching process against newly collected mapping data from the field. Small and Clark, 2000 Blome and others, 2005 Clark and Journey, 2006 Clark and others, 2006 Clark and others, 2013 USGS, 2020 2018 Digital U.S. Geological Survey 7.5-minute topographical quadrangle maps were used as a field base map to aid in reconnaissance and field mapping efforts. The digital topographic quadrangles were used as the reference base map on which to make notations of identified features. USGS, 2020 2019 Hardcopy printouts of the digital version of the U.S. Geological Survey 7.5-minute topographic quadrangles were also used in field mapping efforts. Hydrostratigraphic unit contacts, faults, and descriptions were drawn onto the quadrangles as well. Use of the hard copy versus digital version was dependent on the mapper's preference as well as the availability of cellular service for the computer tablet when in the field. USGS, 2020 2019 Waypoints were collected in the field with the use of handheld gps units and gps enabled devices. Each collected waypoint was labeled with descriptions for the identified hydrostraphic units and/or faults. 2019 Waypoints were transferred to a geographic information system and used to assist in the digitization process to create the hydrostratigraphic unit contacts and faults at the appropriate scale. Neighboring waypoints were used as a guide to help infer the path of the unit contact and/or fault in between waypoints. Waypoints were used to create a point dataset to contain the map unit descriptors. Stein and Ozuna, 1995 Clark, 2003 Clark and others, 2009 Blome and Clark, 2014 Clark and others, 2016a Clark and others, 2016b 2019 The field identified hydrostratigraphic contacts and faults were digitized with the aid of a digital contour dataset that aligns with the U.S. Geological 7.5-minute quadrangle contours. Contours that were coincident with field identified contacts were traced and attributed as contact-certain. Waypoints with field identified descriptors were transferred to a map unit labeling point feature class. The digitized line work and map unit point data were then used to create a surficial geology polygon dataset with the use of the Feature to Polygon tool. TNRIS, 1999 USGS, 2020 2019 Topological errors were checked and corrected for duplicate polygons and lines, gaps, overshoots, undershoots, overlaps, and dangles. 2019 Attributes were added that included group, formation, members, aquifer/hydrologic unit, hydrogeologic function, thickness, and porosity types. Shumard, 1860 Hill, 1887 Hill, 1888 Hill, 1891 Hill, 1892 Hill and Vaughan, 1898 Vaughan, 1900a Vaughan, 1900b Udden, 1907 Liddle, 1918 Adkins, 1932 Stenzel, 1938 Wilmarth, 1938 Hazzard, 1939 Ross, 1943 Lozo and Stricklin, 1956 Stricklin and others, 1971 Rose, 1972 Inden, 1974 Perkins, 1974 U.S. Geological Survey, 2018 2020 Cartographic labeling on the Scientific Investigations Map (SIM) for geologic units is dependent on the facies transition line. Edwards Group labels were used up gradient from the facies transition line. Devils River Limestone labels were used down gradient from the facies transition line. For contiguous polygons that cross the facies line, a majority rule was applied to the geospatial data attribution. For example, if the majority of the polygon and the fault block the polygon is located in fell down gradient of the facies line, the Devils River Limestone labeling was given to the polygon in the geospatial dataset. 2020 Vector G-polygon 2290 Universal Transverse Mercator 14 0.9996 -99.0 0.0 500000.0 0.0 coordinate pair 0.6096 0.6096 meters North_American_Datum_1983 GRS_1980 6378137.0 298.257222101 MedinaCntyGeo Polygon features of mapped hydrostratigraphic units within the study area. Group, formation, and member were modified from Shumard (1860), Hill (1887, 1888, 1891, 1892), Hill and Vaughan (1898), Vaughan (1900a, b), Udden (1907), Adkins (1932), Stenzel (1938), Wilmarth (1938), Hazzard (1939), Ross (1943), Lozo and Stricklin (1956), Stricklin and others (1971), Rose (1972), Inden (1974), Perkins (1974), Stein and Ozuna (1995), Small and Clark (2000), Clark (2003), Clark and others (2009, 2016b), and U.S. Geological Survey (2018). FID Internal feature number. Esri Sequential unique whole numbers that are automatically generated. Shape Feature geometry. Esri Coordinates defining the features. Unit_Order Number indicates the general map unit order from youngest to oldest. Producer Defined 0 29 Geo_Unit_1 Abbreviation for each map unit within the project boundary. Assigned unit names were modified from Shumard (1860), Hill (1887, 1888, 1892), Hill and Vaughan (1898), Udden (1907), Liddle (1918), Adkins (1932), Stenzel (1938), Wilmarth (1938), Ross (1943), Rose (1972), Maclay and Small (1976), Stein and Ozuna (1995), Clark and others (2009, 2016), Blome and Clark (2014), Clark and Morris (2015), and U.S. Geological Survey (2018). Map unit abbreviations: Ig, Kpg, Ka, Kef, Kb, Kdr, Kg, Kdrvu, Kpcm, Kplc, Kdrvurd, Kprd, Kdrvlg, Kkg, Kdrvlke, Kkke, Kdrvld, Kkd, Kdrvlbn, Kkbn, Kgrc, Kgrcb, Kgrue, Kgrf, Kgruf, Kgrlf, Kgrle, Kgrb, Kgrlb, and Kgrts Geo_Unit_2 Name of each map unit within the project boundary. Assigned unit names were modified from Shumard (1860), Hill (1887, 1888, 1892), Hill and Vaughan (1898), Udden (1907), Liddle (1918), Adkins (1932), Stenzel (1938), Wilmarth (1938), Ross (1943), Rose (1972), Maclay and Small (1976), Stein and Ozuna (1995), Clark and others (2009, 2016), Blome and Clark (2014), Clark and Morris (2015), and U.S. Geological Survey (2018). Map units: Igneous, Pecan Gap Chalk, Austin, Eagle Ford, Buda Limestone, Del Rio Clay, Georgetown Formation, Devils River Limestone (Upper), Cyclic and marine (undivided), Leached and collapsed (Undivided), Devils River Limestone (upper) - Regional dense, Regional dense, Devils River Limestone (lower) - Grainstone, Grainstone, Devils River Limestone (lower) - Kirschberg evaporite, Kirschberg evaporite, Devils River Limestone (lower) - Dolomitic, Dolomitic, Devils River Limestone (lower) - Basal nodular, Basal nodular, Cavernous, Camp Bullis, Upper evaporite, Fossiliferous, Upper Fossiliferous, Lower Fossiliferous, Lower evaporite, Bulverde, Little Blanco, and Twin Sisters GroupNm Group each mapped unit belongs to. Trinity Group (Hill, 1888; Ross, 1943; Clark and others, 2009; Blome and Clark, 2014), Edwards Group (Hill and Vaughan, 1898; Rose, 1972; Maclay and Small, 1976; Small and Clark, 2000), Washita Group (Adkins, 1932; Vaughan (1900a, b), Eagle Ford Group (Hill, 1887; Wilmarth, 1938), Austin Group (Shumard, 1860; Adkins, 1932); Taylor Group (Hill, 1892; Stenzel, 1938) -9999 No Data Producer defined Map unit may belong to one of the following groups listed: Taylor, Austin, Eagle Ford, Washita, Edwards, or Trinity. Map unit Ig does not have an assigned group name. Formation Name of the formation. Glen Rose Limestone Formation (Hill, 1888; Ross, 1943; Clark and others, 2019; Blome and Clark, 2014); Devils River Limestone Formation (Udden, 1907); Person, Kainer, and Fort Terrett Formations (Hill and Vaughan, 1898; Rose, 1972; Maclay and Small, 1976; Small and Clark, 2000); Buda Limestone, Del Rio Clay, and Georgetown Formations (Adkins, 1932; Vaughan (1900a, b)); Pecan Gap Chalk Formation (Hill, 1892; Stenzel, 1938) -9999 No Data Producer defined Mapped unit may belong to one of the following formations: Pecan Gap Chalk, Buda Limestone, Del Rio Clay, Georgetown, Devils River Limestone, Person, Devils River Limestone, Kainer/Fort Terrett, or Glen Rose Limestone. Map units Ig, Ka, and Kef do not have an assigned formation. Member Formal or informal member name for each mapped hydrostratigraphic unit within the project boundary. Group, formation, and member were modified from Shumard (1860), Hill (1887, 1888, 1891, 1892), Hill and Vaughan (1898), Vaughan (1900a, b), Udden (1907), Adkins (1932), Stenzel (1938), Wilmarth (1938), Hazzard (1939), Ross (1943), Lozo and Stricklin (1956), Stricklin and others (1971), Rose (1972), Inden (1974), Perkins (1974), Stein and Ozuna (1995), Small and Clark (2000), Clark (2003), Clark and others (2009, 2016b), and U.S. Geological Survey (2018). -9999 No Data Producer defined Map units may belong to one of the following members: Upper part of the Devils River Limestone, Cyclic and marine (Undivided), Leached and collapsed (Undivided), Regional dense (Upper part of the Devils River Limestone), Regional dense, Grainstone (Lower part of the Devils River Limestone), Grainstone, Kirschberg evaporite (Lower part of the Devils River Limestone), Kirschberg evaporite, Dolomitic (Lower part of the Devils River Limestone), Dolomitic, Basal nodular (Lower part of the Devils River Limestone), Basal nodular, Glen Rose Limestone (Upper), or Glen Rose Limestone (Lower). Map units Ig, Ka, Kef, Kb, Kdr, and Kg do not have an assigned member. Hydro_Unit Defines which hydrologic unit the mapped hydrostratigraphic unit belongs to. Hydrologic unit descriptions from Maclay and Small (1976) and Ashworth (1983). -9999 No Data Producer defined Map units belong to one of the following hydrologic units: Upper confining unit to the Edwards aquifer, Edwards aquifer, upper zone of the Trinity aquifer, or middle zone of the Trinity aquifer. Map unit Ig does not have an assigned hydrologic unit. Hydrostrat Hydrostratigraphic unit name for mapped units within the project boundary. Assigned hydrostratigraphic unit names were modified and expanded from Maclay and Small (1976), Stein and Ozuna (1995), Clark and others (2009), Blome and Clark (2014), Clark and Morris (2015), and Clark and others (2016). -9999 No Data Producer defined Map units may belong to one of the following: I, IIa, II, III, IV, V, VI, VII, VIII, Cavernous, Camp Bullis, Upper evaporite, Fossiliferous, Upper Fossiliferous, Lower Fossiliferous, Lower evaporite, Bulverde, Little Blanco, or Twin Sisters. The map units Ig, Ka, Kef, Kb, Kdr, and Kpg do not have an equivalent hydrostratigraphic unit. Thickness Range of thickness for each unit mapped. Units in feet. Thickness from Clark (2003) and Clark and others (2009, 2016b). -9999 No Data Producer defined Either a single thickness value or a range of thickness, in feet, for each mapped unit within the study area: 2-20, 8-10, 10, 20-24, 20-40, 30-40, 30-50, 30-70, 40-50, 40-60, 50-60, 70-90, 80-90, 90-140, 100-120, 120-140, 130-160, 150-250, or 230-540. Map unit Ig does not have an assigned thickness. Hydro_Func Description of the hydrologic function for each map unit. Hydrologic functions are from Stein and Ozuna (1995), Small and Clark (2000), Clark (2003), and Clark and others (2009, 2016b). -9999 No Data Producer defined The hydrologic function descriptions are Aquifer; Aquifer, confining unit in areas without caves; Confining unit; Confining unit, locally water bearing in cavernous zones; or Semiconfining unit. Map unit Ig does not have an assigned hydrologic function. Porosity Description of the type of porosity for each map unit. Porosity types are defined as fabric selective or not fabric selective. Porosity types have been modified from Choquette and Pray (1970). -9999 No Data Producer defined None No porosity for the map unit. Producer defined IP Interparticle porosity (fabric selective) Producer defined IG Intergranular porosity (fabric selective) Producer defined MO Moldic porosity (fabric selective) Producer defined BU Burrowed porosity (fabric selective) Producer defined BP Bedding plane porosity (fabric selective) Producer defined FR Fracture porosity (not-fabric selective) Producer defined CH Channel porosity (not-fabric selective) Producer defined BR Breccia (not-fabric selective) Producer defined VUG vug porosity (not-fabric selective) Producer defined CV Cave porosity (not-fabric selective) Producer defined FieldID General description of map unit characteristics for field identification. Orbitolina minuta (Douglas, 1960); Orbitolina texana (Roemer, 1852); BRBs, spherical textural features locally known as black rotund bodies (Maclay and Small, 1983); carbonate classification from Dunham (1962) and Wright (1992); -9999 No Data Producer defined Map unit descriptors and characteristics for field identification purposes. Shape_Leng Length of feature in internal units. (In geodatabase feature class, attribute label appears as "Shape_Length"). 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. MedinaCntyLns Line features of mapped structural features within the study area. Producer Defined FID Internal feature number. (In geodatabase feature class, attribute label appears as "OBJECTID".) Esri Sequential unique whole numbers that are automatically generated. Shape Feature geometry. Esri Coordinates defining the features. Type Identifiers for each line feature. Producer Defined Defines the line feature as one of the following: contact-certain, fault-certain, fault-inferred, and boundary. Notes Field used to identify the fault name if known. Producer Defined Fault names if known. Shape_Leng Length of feature in internal units. (In geodatabase feature class, attribute label appears as "Shape_Length".) Esri Positive real numbers that are automatically generated. MedinaStdyBnd Polygon feature outlining the geographical extent for this mapping project. Producer Defined FID Internal feature number. (In geodatabase feature class, attribute label appears as "OBJECTID" Esri Sequential unique whole numbers that are automatically generated. Shape Feature geometry. Esri Coordinates defining the features. Shape_Leng Length of feature in internal units. (In geodatabase feature class, attribute label appears as "Shape_Length"). 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. GS ScienceBase U.S. Geological Survey mailing and physical

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Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner. This database, identified as [MedinaSIM3461.gdb], has been approved for release by the U.S. Geological Survey (USGS). Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, the database is released on condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Digital Data https://doi.org/10.5066/P9HHMBX8 None 20200921 Diana E. Pedraza U.S. Geological Survey Geographer mailing and physical

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San Antonio TX 78249 US 210-691-9237 210-691-9270 dpedraza@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998