Alexis P. Lamberts Allan K. Clark Robert R. Morris 20240913 vector digital data Denver, Colo. U.S. Geological Survey In cooperation with the Edwards Aquifer Authority https://doi.org/10.5066/P9G6G8GT Allan K. Clark Robert R. Morris Alexis P. Lamberts 2024 publication n/a US Geological Survey https://doi.org/10.3133/sim3526 The karstic Edwards and Trinity aquifers are classified as major sources of water in south-central Texas by the Texas Water Development Board, and both are classified as major aquifers by the State of Texas. The Edwards and Trinity aquifers developed because of the original depositional history of the carbonate limestone and dolomite rocks that contain them, and the primary and secondary porosity, diagenesis, fracturing, and faulting that modified the porosity, permeability, and transmissivity of each aquifer and of the geologic units separating the aquifers. Previous studies such as those by the U.S. Geological Survey (USGS) and the Edwards Aquifer Authority (EAA) have mapped the geology, hydrostratigraphy, and structure in these areas at various scales. The purpose of this data release is to present the data that were collected and compiled to describe the geologic framework and hydrostratigraphy of northern Medina county, Texas in order to help water managers, water purveyors, and local residents better understand and manage water resources. The scope of the larger work and this accompanying data release is focused on the geologic framework and hydrostratigraphy of the outcrops and hydrostratigraphy of the rocks that contain the Edwards and Trinity aquifers within northern Medina county, Texas. These digital data accompany Clark and others (2024), which supersedes Scientific Investigations Map 3461. These digital data represent the geographical extent of the surficial hydrostratigraphic units and faulting in northern Medina county in south-central Texas. With a rapidly increasing population placing an increasing demand on water resources, the updated mapped hydrostratigraphic units are intended to aid in identifying units that likely facilitate groundwater recharge or discharge or function as a confining layer. These digital data accompany Clark and others (2024). 2024 publication date Complete None planned -99.4125 -98.8052 29.6907 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 Georgetown Formation 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 Fort Terrett Formation Pecan Gap Chalk Buda Limestone Del Rio Clay USGS Thesaurus digitization geospatial datasets geologic maps geography geology hydrogeology stratigraphy geologic contacts surficial geologic units stratigraphic thickness porosity groundwater karst hydrostratigraphy USGS Metadata Identifier USGS:64cc1812d34e2d58db2fa981 U.S. Board on Geographic Names (BGN) Diversion Lake Hondo Hondo Creek Medina County Medina Lake Medina River Seco Creek Verde Creek Texas None. Please see 'Distribution Info' for details. 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 otpublicinfo@usgs.gov Microsoft Windows 10 Version 10.0 (Build 19044); Esri ArcGIS Pro 3.1 Data were collected in the field with the use of geolocation enabled devices. While in the field, mapping attributes were tagged to waypoints (specific latitudes and longitudes and other reference points). Authors have reviewed the attributes for accuracy and completeness through visual inspection in a geospatial information system. Newly mapped data and their associated attributes were compared against previously published mapping reports. Map elements were visually checked for errors during the use of GIS software, including 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 for display 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 3526. Ted A. Small Allan K. Clark 2000 publication U.S. Geological Survey 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 publication U.S. Geological Survey Scientific Investigations Map 2873 Denver, Colorado 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 U.S. Geological Survey Scientific Investigations Report 2006-5200 Reston, Virginia 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) Identification of flow paths Allan K. Clark Jason R. Faith Charles D. Blome Diana E. Pedraza 2006 publication U.S. Geological Survey Open-File Report 2006-1372 Reston, Virginia 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 U.S. Geological Survey Scientific Investigations Report 2013-5149 Reston, Virginia 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 U.S. Geological Survey Water-Resources Investigations Report 95-4030 Austin, Texas U.S. Geological Survey In cooperation with the San Antonio Water System https://doi.org/10.3133/wri954030 24000 Digital and/or Hardcopy 1995 publication date Stein and Ozuna (1995) Geologic and hydrostratigraphic unit descriptions; hydrogeologic function Allan K. Clark 2003 publication U.S. Geological Survey Water-Resources Investigations Report 2003-4081 Austin, Texas 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; unit thicknesses Amy R. Clark Charles D. Blome Jason R. Faith 2009 publication U.S. Geological Survey Open-File Report 2009-1008 Reston, Virginia 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; unit thicknesses Charles D. Blome Allan K. Clark 2014 publication U.S. Geological Survey Data Series 768 Denver, Colorado 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 R. Morris 2016 1.1 publication U.S. Geological Survey Scientific Investigations Map 3363 Reston, Virginia 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 U.S. Geological Survey Scientific Investigations Map 3366 Reston, Virginia 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; unit thicknesses Philip W. Choquette Lloyd 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) Description of porosity types Robert W. Maclay Ted A. Small 1976 publication U.S. Geological Survey Open-File Report 76-627 Reston, Virginia U.S. Geological Survey https://doi.org/10.3133/ofr76627 Digital and/or Hardcopy 1976 publication date Maclay and Small (1976) Hydrologic unit descriptions John B. Ashworth 1983 publication Texas Department of Water Resources Report 273 Austin, Texas 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 properties Ferdinand von 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) Description of cretaceous formations and organic inclusions Raymond C. Douglass 1960 publication U.S. Geological Survey Professional Paper 333 Washington, D.C. U.S. Geological Survey https://doi.org/10.3133/pp333 Digital and/or Hardcopy 1960 publication date Douglass (1960) Description of Orbitolina Benjamin F. Shumard 1860 publication Transactions v. 1 St. Louis, Missouri Academy of Science of St. Louis Digital and/or Hardcopy 1860 publication date Shumard (1860) Descriptions of group, formation, and members Robert T. Hill 1887 publication American Journal of Science series 3, v. 33, no. 196 New Haven, Connecticut American Journal of Science https://ajsonline.org/article/64400 Digital and/or Hardcopy 1887 publication date Hill (1887) Description of group, formation, and members Robert T. Hill 1888 publication None v. 11, Issue 258 Unknown Science https://www.science.org/doi/10.1126/science.ns-11.258.21.a Digital and/or Hardcopy 1888 publication date Hill (1888) Description of group, formation, and members Robert T. Hill 1891 publication GSA Bulletin vol. 2, issue 1 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) Description of group, formation, and members Robert T. Hill 1892 publication The American Geologist vol. 10, no. 2 Minneapolis, MN The Geological Publishing Company pgs. 105-115 Digital and/or Hardcopy 1892 publication date Hill (1892) Description of topography Robert T. Hill T. Wayland Vaughan 1898 publication Annual Report of the U.S. Geological Survey 18, part 2 Washington, D.C. U.S. Geological Survey https://doi.org/10.3133/ar18 Digital and/or Hardcopy 1898 publication date Hill and Vaughan (1898) Descriptions of geology and hydrologic function T. Wayland Vaughan 1900 publication U.S. Geological Survey Folios of the Geologic Atlas 64 Washington, D.C. U.S. Geological Survey https://doi.org/10.3133/gf64 Digital and/or Hardcopy 1900 publication date Vaughan (1900a) Description of group, formation, members and unit thicknesses T. Wayland Vaughan 1900 publication Bulletin of the United States Geological Survey 164 Washington, D.C. U.S. Geological Survey https://doi.org/10.3133/b164 Digital and/or Hardcopy 1900 publication date Vaughan (1900b) Descriptions of group, formation, and members Johan A. Udden 1907 publication : Augustana college and theological seminary, Rock Island, Ill. Library. Augustana library publications 6 Rock Island, Illinois Augustana Library Digital and/or Hardcopy 1907 publication date Udden (1907) Descriptions of group, formation, members and unit thicknesses Elias H. Sellards Walter S. Adkins Frederick B. Plummer 1932 publication The University of Texas Bulletin No. 3232, part 2 Austin, Texas University of Texas, Bureau of Economic Geology https://repositories.lib.utexas.edu/handle/2152/24040 Digital and/or Hardcopy 1932 publication date Sellards and others (1932) Identification and descriptions of stratigraphy Henryk B. Stenzel 1938 publication The University of Texas Publication 3818 Austin, Texas The University of Texas https://repositories.lib.utexas.edu/handle/2152/27652 Digital and/or Hardcopy 1938 publication date Stenzel (1938) Description of group, formation, and members Mary G. Wilmarth 1938 publication U.S. Geological Survey Bulletin 896 Washington, D.C. U.S. Geological Survey https://doi.org/10.3133/b896 Digital and/or Hardcopy 1938 publication date Wilmarth (1938) Description of group, formation, and members Roy T. Hazzard Bernard W. Blanpied 1939 publication Digital and/or Hardcopy 1939 publication date Hazzard and Blanpied (1939) Description of group, formation, and members Clyde P. Ross 1943 publication U.S. Geological Survey 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) Description of group, formation, and members Frank E. Lozo Fred L. Stricklin, Jr. 1956 publication Gulf Coast Association of Geological Societies Transactions v. 6 Unknown Gulf Coast Association of Geological Societies Digital and/or Hardcopy 1956 publication date Lozo and Stricklin (1956) Description of group, formation, and members Fred L. Stricklin, Jr. Charles I. Smith Frank E. Lozo 1971 publication Bureau of Economic Geology Report of Investigations v. 71 Austin, Texas University of Texas Digital and/or Hardcopy 1971 publication date Stricklin and others (1971) Description of group, formation, and members Peter R. Rose 1972 publication Bureau of Economic Geology 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) Description of group, formation, and members Richard F. Inden 1974 publication Geoscience and Man v. 8 Baton Rouge, Louisiana Louisiana State University In Perkins, B.F., and Amsbury, D.L., eds., Aspects of Trinity Geology Division Digital and/or Hardcopy 1974 publication date Inden (1974) Description of group, formation, and members Bob F. Perkins 1974 publication Geoscience and Man v. 8 Baton Rouge, Louisiana Louisiana State University In Perkins, B.F., and Amsbury, D.L. eds., Aspects of Trinity Geology--A symposium on the stratigraphy, sedimentary environments, and fauna of the Comanche Cretaceous Trinity Division (Aptian and Albian) of Texas and northern Mexico Digital and/or Hardcopy 1974 publication date Perkins (1974) Description of group, formation, and members U.S. Geological Survey 2018 application/service Reston, Virginia U.S. Geological Survey Online database http://ngmdb.usgs.gov/Geolex/search Digital and/or Hardcopy 2018 publication date U.S. Geological Survey (2018) Geologic naming, geologic unit descriptions Robert W. Maclay Ted A. Small 1983 publication Journal of Hydrology v 61, issues 1-3 Amsterdam 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) Description of black rotund bodies for field identification Robert J. Dunham 1962 publication American Association of Petroleum Geologists Memoir 1 Vol. 1 Unknown American Association of Petroleum Geologists American Association of Petroleum Geologists Memoir 1, p. 108-121; in Ham, W.E. Classification of carbonate rocks symposium https://doi.org/10.1306/M1357 Digital and/or Hardcopy 1962 publication date Dunham (1962) Description of carbonate classification system based on depositional texture V. Paul Wright 1992 publication Sedimentary Geology v. 76, no. 3-4 Amsterdam Elsevier https://doi.org/10.1016/0037-0738(92)90082-3 Digital and/or Hardcopy 1992 publication date Wright (1992) Revision to the carbonate classification systems of Dunham (1962) and others with new “diagenetic” categories. U.S. Geological Survey 2023 raster digital data Reston, Virginia U.S. Geological Survey https://ngmdb.usgs.gov/topoview/ 24000 Digital and/or Hardcopy 1958 1992 publication date U.S. Geological Survey (2023) 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 1969 (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 1998 vector digital data Austin, Texas Texas Natural Resources Information System https://data.tnris.org/ 24000 Digital and/or Hardcopy 1998 publication date TNRIS (1998) Elevation contours Ralph A. Liddle 1918 publication University of Texas Bulletin No. 1860 Austin, Texas University of Texas http://hdl.handle.net/2152/23691 Digital and/or Hardcopy 1918 publication date Liddle (1918) Descriptions of igneous intrusive rocks Walter S. Adkins 1932 publication Bureau of Economic Geology UT Bulletin 3232 Austin, Texas University of Texas In the Geology of Texas: University of Texas, Publication 3252, p. 329-518 in Sellards, E.H., Adkins, W.C., and Plummer, F.B., eds. https://store.beg.utexas.edu/ut-bulletins/253-bl3232.html Digital and/or Hardcopy 1932 publication date Adkins (1932) Description and stratigraphy of the Mesozoic systems in Texas 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 quadrangle maps 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) U.S. Geological Survey (2023) 2019 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. U.S. Geological Survey (2023) 2023 Hardcopy printouts of the digital versions 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. U.S. Geological Survey (2023) 2020 Waypoints of hydrostratigraphic unit and fault locations were collected in the field with the use of handheld Global Positioning System (GPS) units and GPS-enabled devices. Waypoints were labeled with descriptions for the identified feature. 2023 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 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) 2023 The field identified hydrostratigraphic contacts and faults were digitized with the aid of a digital elevation contour dataset that aligns with the U.S. Geological Survey 7.5-minute topographical quadrangle elevation contours. Elevation 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 (1998) U.S. Geological Survey (2023) 2023 Topological errors were checked and corrected for duplicate polygons and lines, gaps, overshoots, undershoots, overlaps, and dangles. 2023 Attributes were added that included group, formation, member, and aquifer/hydrologic unit names in addition to 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 and Blanpied (1939) Ross (1943) Lozo and Stricklin (1956) Stricklin and others (1971) Rose (1972) Inden (1974) Perkins (1974) U.S. Geological Survey (2018) 2023 Cartographic labeling for stratigraphically equivalent geologic units, such as the Edwards Group and Devils River Limestone, is based on their outcrop locations relative to the facies transition line. Labels for geologic units that are part of the Edwards Group were used northeast of the facies transition line. Labels for geologic units that are part of the Devils River Limestone were used southwest of 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 was southwest of the facies line, the polygon was labeled as "Devils River Limestone" in the geospatial dataset. 2023 Vector G-polygon 2543 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 Polygon A closed shape defined by a connected sequence of x,y coordinate pairs. Producer defined Unit_Order Number indicates the general map unit order from youngest to oldest. Producer Defined 0 33 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). Kig Igneous intrusive rock Producer defined Kpg Pecan Gap Chalk Producer defined Ka Austin Group Producer defined Kef Eagle Ford Group Producer defined Kb Buda Limestone Producer defined Kdr Del Rio Clay Producer defined Kg Georgetown Formation Producer defined Kdrvu upper part of the Devils River Limestone Producer defined Kpcm informal cyclic and marine members (undivided) Producer defined Kplc informal leached and collapsed members (undivided) Producer defined Kdrvurd upper part of the Devils River Limestone - informal regional dense member Producer defined Kprd informal regional dense member Producer defined Kdrvlg lower part of the Devils River Limestone - informal grainstone member Producer defined Kkg informal grainstone member Producer defined Kdrvlke lower part of the Devils River Limestone - Kirschberg evaporite member Producer defined Kkke Kirschberg evaporite member Producer defined Kdrvld lower part of the Devils River Limestone - informal dolomitic member Producer defined Kkd informal dolomitic member Producer defined Kdrvlb lower part of the Devils River Limestone - informal burrowed member Producer defined Kkb informal burrowed member Producer defined Kdrvlbn lower part of the Devils River Limestone - informal basal nodular member Producer defined Kkbn informal basal nodular member Producer defined Kgrc cavernous hydrostratigraphic unit Producer defined Kgrcb Camp Bullis hydrostratigraphic unit Producer defined Kgrue upper evaporite hydrostratigraphic unit Producer defined Kgrf fossiliferous hydrostratigraphic unit Producer defined Kgruf upper fossiliferous hydrostratigraphic unit Producer defined Kgrlf lower fossiliferous hydrostratigraphic unit Producer defined Kgrle lower evaporite hydrostratigraphic unit Producer defined Kgrb Bulverde hydrostratigraphic unit Producer defined Kgrlb Little Blanco hydrostratigraphic unit Producer defined Kgrts Twin Sisters hydrostratigraphic unit Producer defined Kgrd Doeppenschmidt hydrostratigraphic unit Producer defined Kgrr Rust hydrostratigraphic unit Producer defined 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). Igneous intrusive rock Kig Producer defined Pecan Gap Chalk Kpg Producer defined Austin Group Ka Producer defined Eagle Ford Group Kef Producer defined Buda Limestone Kb Producer defined Del Rio Clay Kdr Producer defined Georgetown Formation Kg Producer defined upper part of the Devils River Limestone (Kdrvu), informal regional dense member (Kdrvurd) Producer defined informal cyclic and marine members (undivided) Kpcm Producer defined informal leached and collapsed members (undivided) Kplc Producer defined upper part of the Devils River Limestone - informal regional dense member Kdrvurd Producer defined informal regional dense member Kprd Producer defined lower part of the Devils River Limestone informal grainstone member (Kdrvlg), Kirschberg evaporite member (Kdrvlke), informal dolomitic member (Kdrvld), informal burrowed member (Kdrvlb), informal basal nodular member (Kdrvlbn) Producer defined Lower part of the Devils River Limestone - informal grainstone member Kdrvlg Producer defined informal grainstone member Kkg Producer defined Lower part of the Devils River Limestone - Kirschberg evaporite member Kdrvlke Producer defined Kirschberg evaporite member Kkke Producer defined Lower part of the Devils River Limestone - informal dolomitic member Kdrvld Producer defined informal dolomitic member Kkd Producer defined Lower part of the Devils River Limestone - informal burrowed member Kdrvlb Producer defined informal burrowed member Kkb Producer defined Lower part of the Devils River Limestone - informal basal nodular member Kdrvlbn Producer defined informal basal nodular member Kkbn Producer defined cavernous hydrostratigraphic unit Kgrc Producer defined Camp Bullis hydrostratigraphic unit Kgrcb Producer defined upper evaporite hydrostratigraphic unit Kgrue Producer defined fossiliferous hydrostratigraphic unit Kgrf Producer defined upper fossiliferous hydrostratigraphic unit Kgruf Producer defined lower fossiliferous hydrostratigraphic unit Kgrlf Producer defined lower evaporite hydrostratigraphic unit Kgrle Producer defined Bulverde hydrostratigraphic unit Kgrb Producer defined Little Blanco hydrostratigraphic unit Kgrlb Producer defined Twin Sisters hydrostratigraphic unit Kgrts Producer defined Doeppenschmidt hydrostratigraphic unit Kgrd Producer defined Rust hydrostratigraphic unit Kgrr Producer defined GroupNm Group each mapped unit belongs to, if applicable. 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 Map unit in question does not have an associated group. Producer defined Taylor Group Pecan Gap Chalk (Kpg) Producer defined Austin Group (Ka) Producer defined Eagle Ford Group (Kef) Producer defined Washita Group Buda Limestone (Kb), Del Rio Clay (Kdr), Georgetown Formation (Kg) Producer defined Edwards Group upper part of the Devils River Limestone: undivided (Kdrvu), informal regional dense member (Kdrvurd); Person Formation: informal cyclic and marine members (undivided) (Kpcm), informal leached and collapsed members (undivided) (Kplc); lower part of the Devils River Limestone: informal grainstone member (Kdrvlg), Kirschberg evaporite member (Kdrvlke), informal dolomitic member (Kdrvld), informal burrowed member (Kdrvlb), informal basal nodular member (Kdrvlbn); Kainer/Fort Terrett Formation: informal grainstone member (Kkg), Kirschberg evaporite member (Kkke), informal dolomitic member (Kkd), informal burrowed member (Kkb), informal basal nodular member (Kkbn) Producer defined Trinity Group Glen Rose Limestone (Upper): cavernous hydrostratigraphic unit (Kgrc), Camp Bullis hydrostratigraphic unit (Kgrcb), upper evaporite hydrostratigraphic unit (Kgrue), fossiliferous hydrostratigraphic unit (Kgrf), upper fossiliferous hydrostratigraphic unit (Kgruf), lower fossiliferous hydrostratigraphic unit (Kgrlf), lower evaporite hydrostratigraphic unit (Kgrle); Glen Rose Limestone (Lower): Bulverde hydrostratigraphic unit (Kgrb), Little Blanco hydrostratigraphic unit (Kgrlb), Twin Sisters hydrostratigraphic unit (Kgrts), Doeppenschmidt hydrostratigraphic unit (Kgrd), Rust hydrostratigraphic unit (Kgrr) Producer defined 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 Map unit in question does not have an associated formation. Producer defined Pecan Gap Chalk Formation Pecan Gap Chalk (Kpg) Producer defined Buda Limestone Formation Buda Limestone (Kb) Producer defined Del Rio Clay Formation Del Rio Clay (Kdr) Producer defined Georgetown Formation Georgetown Formation (Kg) Producer defined Devils River Limestone Formation upper part of the Devils River Limestone: undivided (Kdrvu), informal regional dense member (Kdrvurd); Person Formation: informal cyclic and marine members (undivided) (Kpcm), informal leached and collapsed members (undivided) (Kplc); lower part of the Devils River Limestone: informal grainstone member (Kdrvlg), Kirschberg evaporite member (Kdrvlke), informal dolomitic member (Kdrvld), informal burrowed member (Kdrvlb), informal basal nodular member (Kdrvlbn); Kainer/Fort Terrett Formation: informal grainstone member (Kkg), Kirschberg evaporite member (Kkke), informal dolomitic member (Kkd), informal burrowed member (Kkb), informal basal nodular member (Kkbn) Producer defined Person Formation informal cyclic and marine members (undivided) (Kpcm), informal leached and collapsed members (undivided) (Kplc) Producer defined Kainer/Fort Terrett Formation informal grainstone member (Kkg), Kirschberg evaporite member (Kkke), informal dolomitic member (Kkd), informal burrowed member (Kkb), informal basal nodular member (Kkbn) Producer defined Glen Rose Limestone Formation Glen Rose Limestone (Upper): cavernous hydrostratigraphic unit (Kgrc), Camp Bullis hydrostratigraphic unit (Kgrcb), upper evaporite hydrostratigraphic unit (Kgrue), fossiliferous hydrostratigraphic unit (Kgrf), upper fossiliferous hydrostratigraphic unit (Kgruf), lower fossiliferous hydrostratigraphic unit (Kgrlf), lower evaporite hydrostratigraphic unit (Kgrle); Glen Rose Limestone (Lower): Bulverde hydrostratigraphic unit (Kgrb), Little Blanco hydrostratigraphic unit (Kgrlb), Twin Sisters hydrostratigraphic unit (Kgrts), Doeppenschmidt hydrostratigraphic unit (Kgrd), Rust hydrostratigraphic unit (Kgrr) Producer defined Member Formal or informal member name. 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 Map unit in question does not have an associated member. Producer defined Upper part of the Devils River Limestone (Kdrvu) Producer defined informal cyclic and marine members (undivided) (Kpcm) Producer defined informal leached and collapsed members (undivided) (Kplc) Producer defined upper part of the Devils River Limestone - informal regional dense member (Kdrvurd) Producer defined informal regional dense member (Kprd) Producer defined lower part of the Devils River Limestone - informal grainstone member (Kdrvlg) Producer defined informal grainstone member (Kkg) Producer defined lower part of the Devils River Limestone - Kirschberg evaporite member (Kdrvlke) Producer defined Kirschberg evaporite member (Kkke) Producer defined lower part of the Devils River Limestone - informal dolomitic member (Kdrvld) Producer defined informal dolomitic member (Kkd) Producer defined lower part of the Devils River Limestone - informal burrowed member (Kdrvlb) Producer defined informal burrowed member (Kkb) Producer defined lower part of the Devils River Limestone - informal basal nodular member (Kdrvlbn) Producer defined informal basal nodular member (Kkbn) Producer defined upper member of the Glen Rose Limestone cavernous hydrostratigraphic unit (Kgrc), Camp Bullis hydrostratigraphic unit (Kgrcb), upper evaporite hydrostratigraphic unit (Kgrue), fossiliferous hydrostratigraphic unit (Kgrf), upper fossiliferous hydrostratigraphic unit (Kgruf), lower fossiliferous hydrostratigraphic unit (Kgrlf), lower evaporite hydrostratigraphic unit (Kgrle); Producer defined lower member of the Glen Rose Limestone Bulverde hydrostratigraphic unit (Kgrb), Little Blanco hydrostratigraphic unit (Kgrlb), Twin Sisters hydrostratigraphic unit (Kgrts), Doeppenschmidt hydrostratigraphic unit (Kgrd), Rust hydrostratigraphic unit (Kgrr) Producer defined Hydro_Unit Defines which hydrologic unit the mapped hydrostratigraphic unit belongs to. Hydrologic unit descriptions from Maclay and Small (1976) and Ashworth (1983). -9999 Mapped unit in question does not have an associated hydrologic unit. Producer defined Upper confining unit to the Edwards aquifer The upper section of the Edwards aquifer. The hydrologic units that make up the upper confining unit to the Edwards Aquifer are: Kpg, Ka, Kig, Kef, Kb, Kdr, and Kg. Producer defined Edwards aquifer A karst aquifer made up of the Edwards Group. The hydrologic units that make up the Edwards aquifer are: Kg, Kdrvu, Kpcm, Kplc, Kdrvurd, Kprd, Kdrvlg, Kkg, Kdrvlke, Kkke, Kdrvld, Kkd, Kdrvlb, Kkb, Kdrvlbn, and Kkbn. Producer defined Upper zone of the Trinity aquifer The upper section of the Trinity aquifer made up of hydrologic units found within the Trinity Group, which are: Kgrc, Kgrcb, Kgrue, Kgrf, Kgruf, and Kgrlf. Producer defined Middle zone of the Trinity aquifer Middle section of the Trinity aquifer made up of hydrologic units found within the Trinity Group, which are: Kgrle, Kgrb, Kgrlb, Kgrts, Kgrd, and Kgrr. Producer defined 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 Mapped unit in question does not have an associated hydrostratigraphic unit. Producer defined I Kg Producer defined IIa Kdrvu Producer defined II Kpcm Producer defined III Kplc Producer defined IV Kdrvurd, Kprd Producer defined V Kdrvlg, Kkg Producer defined VI Kdrvlke, Kkke Producer defined VII Kdrvld, Kkd Producer defined Seco Pass hydrostratigraphic unit Kdrvlb, Kkb Producer defined VIII Kdrvlbn, Kkbn Producer defined cavernous hydrostratigraphic unit Kgrc Producer defined Camp Bullis hydrostratigraphic unit Kgrcb Producer defined upper evaporite hydrostratigraphic unit Kgrue Producer defined fossiliferous hydrostratigraphic unit Kgrf Producer defined upper fossiliferous hydrostratigraphic unit Kgruf Producer defined lower fossiliferous hydrostratigraphic unit Kgrlf Producer defined lower evaporite hydrostratigraphic unit Kgrle Producer defined Bulverde hydrostratigraphic unit Kgrb Producer defined Little Blanco hydrostratigraphic unit Kgrlb Producer defined Twin Sisters hydrostratigraphic unit Kgrts Producer defined Doeppenschmidt hydrostratigraphic unit Kgrd Producer defined Rust hydrostratigraphic unit Kgrr Producer defined Thickness Range of thickness for each mapped unit 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. Map unit Kig 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 Aquifer Hydrologic unit(s) that are permeable and allow the movement of water. Producer defined Aquifer, confining unit in areas without caves Hydrologic unit(s) that are less permeable and restrict the movement of water. Producer defined Confining unit Hydrologic unit(s) that are less permeable and restrict the movement of water. Producer defined Confining unit, locally water bearing in cavernous zones Hydrologic unit(s) that are less permeable and restrict the movement of water, but include water locally in cavernous zones. Producer defined Semiconfining unit Hydrologic unit(s) that are partially permeable and allow for some movement of water. Producer defined 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 Negligible amounts of interparticle and/or intergranular porosities 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 IC Intercrystalline porosity (fabric selective) Producer defined CV (occasional) Cave porosity (not-fabric selective) on an occasional basis 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. -9999 No Data Producer defined Map unit descriptors and characteristics for field identification purposes. 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 Polyline A shape defined by one or more paths, in which a path is a series of connected segments. Producer defined Type Identifiers for each line feature. Producer Defined boundary Artificial boundary marking the edge of the mapped area. Producer defined contact-certain Hydrostratigraphic map unit contact line segment. Producer defined contact-inferred Hydrostratigraphic map unit inferred contact line segment. Producer defined Corbula bed Line segment designating location of the Corbula marker bed. Producer defined fault-certain Fault line segment. Producer defined fault-inferred Inferred fault line segment. Producer defined 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. GS ScienceBase U.S. Geological Survey mailing and physical

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