Smout, Brooklyn 20250512 1 vector digital data Lakewood, CO U.S. Geological Survey https://doi.org/10.5066/P14BV2PI This digital dataset is a result from the goal within the U.S. Geological Survey’s (USGS) National Cooperative Geologic Mapping Program to convert surficial data that were previously published in non-digital format to digital, vector-based data suitable for use by the public and in USGS studies. The objective of the data conversion is to reproduce the original published mapping with little to no added interpretation. This digital data release captures subsurface geologic data within the Mississippi Embayment region, using two publications focusing on water resources and general geology to fulfill missing pieces of a larger network of data. These two legacy publications, ‘Maps of upper Mississippi embayment Paleozoic and Precambrian rocks’ by Richard L. Dart, 1995 and ‘General Geology of the Mississippi Embayment’ By E. M. Cushing, E. H. Boswell, And R. L. Hosman, 1964- were chosen due the focus on structural and isopach data within their publications. There were six selected map figures with structural data digitized, two from Dart, 1995 and four from Cushing, 1964. This does not include any additional input data or speculative interpretations, strictly published structural contour features. While there were six identified maps, there are only five sets of vector data, this is due to combining both sets of Paleozoic features into one feature class- one can differentiate the two based on the listed source attribute. This geologic data set includes structure contour data for the top of the Eocene Sparta Sand, the base of Eocene Cane River Formation and stratigraphic equivalents, the top of Cretaceous rocks, the top of Paleozoic rocks, and the top of Precambrian basement rock. The Sparta Sand is identified as the middle part of the Eocene and is a formation within the Claiborne Group, the Cane River Formation underlies the Sparta Sand and includes all rock from the top of the Carrizo Sand to the base of the Sparta Sand. The Mississippi embayment is an extensive sediment-filled geologic structure underlying parts of eight states in the southcentral U.S. that provides large quantities of groundwater from numerous aquifers to residential and industrious areas. Due to the large size of the Mississippi Embayment and its cross-cutting political boundaries, the names given to the many geologic units may vary from region to region. It is common to call a unit by the name given by the local area, for example; west Tennessee terms the Memphis aquifer the Sparta Sand and Corrizo Sand aquifers, additionally the Sparta Sand is referred to as the Cane River in Arkansas and Louisiana and is the equivalent to the Mount Selma Formation of Texas and the Tallahatta Formation in Mississippi and Alabama. This digital dataset results from goal within the U.S. Geological Survey’s (USGS) National Cooperative Geologic Mapping Program to convert geologic data that were previously published in non-digital format to digital, vector-based data suitable for use by the public and in USGS studies. The objective of the data conversion is to reproduce the original published mapping with little to no added interpretation. The availability of digital data in modern geologic practices, is critical to users and geoscience professionals. There are endless reports and legacy published resources in the U.S. Geological Survey’s (USGS) library that, however valuable, do not include any version of the digital data that has been otherwise published. There are a multitude of efforts occurring within the USGS to extract what could be digital data, and make that available as usable vector or tabular data. These executions occur on a project by project basis, where a need is identified and the void in data filled. This digital dataset was created as part of U.S. Geological Survey efforts to inventory, catalog, and release structural and geologic data in geospatial form as part of a broad directive to develop 2D and 3D geologic information at detailed, national, and continental scales. These data products, derived from previous USGS and other studies, provide a fundamental starting point. The intended uses of this dataset include, but are not limited to, natural resource modeling, mapping, and visualization. The structure contour and isopach data are useful in many instances of geologic mapping and modeling programs, however they especially sought after by the U.S. Geological Survey’s (USGS) National Cooperative Geologic Mapping Program due to the goals of developing region by region geologic models. The geologic map structure contour lines are distributed as separate feature classes within a geographic information system geodatabase and are also saved as shapefiles. Nonspatial tables define the data sources used, the terms used in the dataset, and the geologic units. A tabular data dictionary describes the entity and attribute information for all attributes of the geospatial data and the accompanying nonspatial tables. This geodatabase is compliant with and follows the schema and structure of the USGS National Cooperative Geologic Mapping Program’s digital geologic map data scehema, which is called GeMS [https://ngmdb.usgs.gov/Info/standards/GeMS/]. Not all components of the GeMS data model are utilized in this database. Components used in construction of this database are explained in the Entity and Attribute section. 1970 1995 publication date Complete None planned MIssissippi Embayment -94.7241 -87.7148 34.7597 28.5749 ISO 19115 Topic Category elevation geoscientificInformation inlandWaters structure Geology Precambrian Paleozoic New Madrid Seismic Zone Cane River Formation Cretaceous Sparta Sand USGS Thesaurus vector structure contour isopach contour thickness contour estimated thickness elevation Federal Geographic Data Committee National Cooperative Geologic Map Program GeMS Geologic Mapping Schema fault vector digital data geology USGS Metadata Identifier USGS:66bce5fed34e03388281b416 Location Mississippi embayment Mississippi Louisiana Arkansas Tennessee Mississippi River None. Please see 'Distribution Info' for details. 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 on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Brooklyn Smout U. S. Geological Survey Geologist mailing and physical

Denver Federal Center, Building 810, Mail Stop 302

Lakewood CO 80225 United States Denver Federal Center, Building 810, Mail Stop 302 bsmout@usgs.gov This data release study was funded by the U.S. Geological Survey’s (USGS) National Cooperative Geologic Mapping Program. The USGS acknowledges the digitizing and spatial data services of BRIC, a subsidiary of the Diné Development Corporation. Dataset improvements done by thoughtful technical reviews by Bryant Platt and Katherine Alexander, April 2025. ArcGIS Pro v 3.3.0 Geodatabase file size: 61.7 MB Richard L. Dart 1995 publication Reston, VA U.S. Geological Survey https://doi.org/10.3133/mf2284 E. M. CUSHING, E. H. BOSWELL, P. R. SPEER, and R. L. HOSMAN 1964 publication Washington U.S. Geological Survey https://pubs.usgs.gov/pp/0448b/report.pdf Confidence that a feature exists and confidence that a feature is correctly identified are described in per-feature attributes LocationConfidenceMeters. No formal attribute accuracy tests were conducted. Verification was done by interactive on-screen review. Dataset is considered complete for the information presented. Estimated accuracy of horizontal location is given on a per-feature basis by attribute LocationConfidenceMeters. Values are expected to be correct within a factor of 2. A LocationConfidenceMeters value of -9 or -9999 indicates that no value has been assigned. Estimated accuracy of vertical location is given on a per-feature basis by attribute LocationConfidenceMeters. Values are expected to be correct within a factor of 2. A LocationConfidenceMeters value of -9 or -9999 indicates that no value has been assigned. E.M. Cushing E.H. Boswell R.L. Hosman 1964 publication Washington U.S. Geological Survey Cushing, E.M., et al, 1964, General Geology of the Mississippi Embayment, Geological Survey Professional Paper 448-B: U.S. Geological Survey, https://pubs.usgs.gov/pp/0448b/report.pdf. https://pubs.usgs.gov/pp/0448b/report.pdf Digital and/or Hardcopy 1964 publication date General Geology of the Mississippi Embayment Legacy map R.L. Dart 1995 publication Reston, VA U.S. Geological Survey Dart, R.L., 1995, Maps of upper Mississippi embayment Paleozoic and Precambrian rocks, Miscellaneous Field Studies Map 2284: U.S. Geological Survey, doi: 10.3133/mf2284. https://doi.org/10.3133/mf2284 Digital and/or Hardcopy 1995 publication date Maps of upper Mississippi embayment Paleozoic and Precambrian rocks Legacy map Obtaining reference material: Author obtained reference material such as report(s) and geologic structural map to analyze and digitize. Emphasis here on datasets holding valuable two-dimensional publications within USGS repositories, specifically structure contour, isopach contour, thickness, or elevation data. Data was analyzed based on its criteria and feasibility to digitize, the original plate(s) were downloaded and projected into a GIS (ArcGIS Pro) and georeferenced fro the is project. Maps of upper Mississippi embayment Paleozoic and Precambrian rocks General Geology of the Mississippi Embayment 2024 Author creates a project workspace in ArcGIS Pro: 1- The Author created an active geodatabase based on the FGDC Digital Cartographic Standard for Geologic Map Symbolization GeMS Template to properly organize data. -GeMS .gdb to include a GeologicMap feature dataset and standalone tables: DataSources, DescriptionOfMapUnits, GeoMaterialDictionary, and Glossary. -Each feature class will be set up using proper FGDC symbology and coded domains or templates for digitizing application. -Map and feature classes will be projected in NAD 1983 Contiguous USA Albers WIKID 5070. 2- Downloading requisite style and font files for proper symbology use and assignment while digitizing and labeling features in the map. Style package acquired from Esri - Geology 24K. This will allow for the 'FGDCGA_' font to be used in labeling features properly and with geologic accuracy and for symbology to be matched and FGDC .stylx for symbology assignment. 3- Insert map TIFF to project workspace and reproject data to NAD 1983 Contiguous USA Albers WIKID 5070 projection. 2024 Digitizing Process: The author conducted a faithful digitization effort for this legacy map to ensure the most original material was preserved. this was done with the beginning of the project and the georeferenced map to ensure best positional accuracy for ground conditions. The determined features to digitize were chosen to truly replicate the legacy map, this project was concluded to digitize the following elements: geologic entities such as structure contours, isopach contours, extent boundaries, high angle or thrust faults, and any other faulted lines. Digitized features were followed faithfully to ensure the most accurate representation of the legacy map, however actual map illustrations and virtual digitizations may differ from ground features by up to 500m. To conspire with the required GeMS Schema, feature classes for IsoValueLines house different types of features that were digitized. Using feature templates, features on the map were traced with the appropriate assignment of feature line symbology. 2024 Validation: To comply with Geologic Mapping Schema (GeMS) compliance, a validation of the maps attributes and features was performed. Validating these features is to ensure the map data is adequately represented on a map but also to ensure that there are not any errors. Errors such as mis-matched attributes and that standalone / nonspatial tables additionally comply. To fix errors in validation, using available tools for aid is efficient and effective. The author began this validation by downloading the GeMS Validation toolbox and add it to the active map. This tool script ran with the active map geodatabase as the input and created a new 'Validation' folder in the Map Project folder once the script is complete. Once validation was completed, the two areas to focus attention to fixing were the attribute tables from the topological feature classes and the nonspatial attribute table errors. These errors were reported in script in .html format. GeMS validation was achieved at Level 2, since this data is subsurficial, it does not entirely comply with the requirements for a Level 3 validation, as parts of a Level 3 validation will not be present in subsurficial vector data such as this. Validation was completed to the highest possible standard given the type of data present. 2024 Review: At the conclusion of the authors validation compliance efforts, a peer reviewer was assigned to complete any additional data, metadata, and technical reviews. This review was conducted by Bryant Platt of the U.S. Geological Survey. Reviewed documents were returned to the author for reconciliation, it was common to see errors crop up in topology with some new updates to the mapping software, these errors were fixed with consideration. All additional reconciled comments from the reviewer were made to a separate document including comments made to map features, templates, nonspatial tables, standalone tables, and FGDC standards. The final review was conducted by the technical reviewer, Katherine Alexander, where any additional errors were caught. At final review, metadata was updated and attached to the geodatabase, final touches were added, all FGDC geologic names reviews were made, and a final geodatabase had been produced. 2025 Metadata: The author composed a metadata document with the means of providing substantial background information, credit, and data on any map publication is then accumulated into one document of metadata. The author used tools that are available and that have established metadata standards and provide a framework for which metadata can be reported in. It is beneficial to use one of these tools and have the map data pulled up alongside while metadata is recorded, that way it is easy to consult the map properties and spatial data for reporting. Essential things included in metadata are spatial extent, an abstract and purpose of map, entity and attributes, dataset types, any identifying features, distribution methods, and credits. 2025 Vector Node, network MississippiEmbayment_USGS.gdb ***All features classes in projected coordinates of NAD_1983_Contiguous_USA_Albers, WKID: 5070 Authority: EPSG*** Table Field Definition Minimum Maximum Units DataSources.csv NA Non-spatial table of sources of all spatial features, sources of some attributes of spatial features, and sources of some attributes of non-spatial table entries. NA NA NA DataSources.csv Source Short, terse, easily understood ASCII-character identifier for a data source NA NA NA DataSources.csv FullCitation Complete citation of publication NA NA NA DataSources.csv URL URL link to data (at time of publication), if available NA NA NA DataSources.csv Notes Free text for additional information specific to this entry. NA NA NA DataSources.csv DataSource_ID Foreign key to DataSources table, to track provenance of each data element. Values must be unique in database. Null values not permitted NA NA NA Glossary.csv NA Non-spatial table that, for certain fields (including all Type fields, Confidence fields, and GeneralLithology), lists the terms that populate these fields, term definitions, and sources for definitions. NA NA NA Glossary.csv Term Geologic concept, feature, phenomenon, or other terminology being defined. Values must be unique within database. Null values not permitted NA NA NA Glossary.csv Definition Definition of value in Term NA NA NA Glossary.csv DefinitionSource_ID Identifies source of definition. Foreign key to DataSources table NA NA NA Glossary.csv Notes Optional field. Free text for additional information specific to this feature. Free text for additional information specific to this line feature. Null values permitted NA NA NA Glossary.csv Glossary_ID Prefix "GLO". Values must be unique in database. Null values not permitted NA NA NA DescriptionOfMapUnits.csv NA Non-spatial table that captures content of the Description of Map Units (or equivalent List of Map Units and associated pamphlet text) included in a traditional paper geologic map. Has an internal hierarchy expressed by attribute HierarchyKey. NA NA NA DescriptionOfMapUnits.csv MapUnit Short descriptor of unit or surface being mapped. NA NA NA DescriptionOfMapUnits.csv Name Full name of formal or informal map unit. NA NA NA DescriptionOfMapUnits.csv FullName Full name of formal or informal map unit. NA NA NA DescriptionOfMapUnits.csv Age Geologic age of map unit; Period or Epoch of unit consistent with GSA time scale NA NA NA DescriptionOfMapUnits.csv Description Full text description of map unit NA NA NA DescriptionOfMapUnits.csv ParagraphStyle Name of user-defined paragraph style that indicates hierarchy of map units and headings within DMU. Values must be defined in Glossary table; definition typically includes formatting specifications NA NA NA DescriptionOfMapUnits.csv HierarchyKey Text string that indicates place of map unit or heading within DMU hierarchy. Text string has form of “n-n-n”, “nn-nn”, “nn-nn-nn”, “nnn-nnn”, or similar; each dash-delimited fragment of string (1) is numeric, (2) has same length as others in string and in DescriptionOfMapUnits table, and (3) is left-padded with zeroes if values exceed one digit. NA NA NA DescriptionOfMapUnits.csv Symbol Abbreviated version of Geologic Unit, null values permitted. NA NA NA DescriptionOfMapUnits.csv Label Describes text label for map-unit polygons. Field from which map-unit label is generated NA NA NA DescriptionOfMapUnits.csv DescriptionSourceID Identifies source of Description. Foreign key to DataSources table NA NA NA DescriptionOfMapUnits.csv GeoMaterial Term categorizing the dominant lithology in the map feature. Term derived from NGMDB standard term list in Appendix 1 of the GeMS data model https://ngmdb.usgs.gov/Info/standards/GeMS/) NA NA NA DescriptionOfMapUnits.csv AreaFillRGB Map Unit Polygon color fill reported in RGB values from the FGDC standard. Null values permitted. NA NA NA DescriptionOfMapUnits.csv AreaFillPatternDescription Map Unit Polygon color fill and descriptive representation reported in RGB values from the FGDC standard. Null values permitted. NA NA NA DescriptionOfMapUnits.csv GeoMaterialConfidence Qualitative term describing appropriateness of the GeoMaterial term used (low, medium, high). NA NA NA DescriptionOfMapUnits.csv Notes Free text for additional information specific to this entry. NA NA NA DescriptionOfMapUnits.csv DescriptionOfMapUnits_ID Prefix "DMU". Values must be unique in database. Null values not permitted. NA NA NA GeoMaterialDict.csv NA Non-spatial table that provides values of GeoMaterial, placed in a hierarchy, and their definitions. For further information, see Appendix A in GeMS documentation, available at http://ngmdb.usgs.gov/Info/standards/GeMS. NA NA NA GeoMaterialDict.csv HierarchyKey Delimited text string used to indicate order and hierarchical relations between parent and child records. NA NA NA GeoMaterialDict.csv GeoMaterial Categorization of map unit based on lithologic and genetic character, term selected from NGMDB standard term list defined in Appendix A of GeMS documentation, available at http://ngmdb.usgs.gov/Info/standards/GeMS. NA NA NA GeoMaterialDict.csv IndentedName Name with addition of leading spaces to help show rank within a hierarchical list. NA NA NA GeoMaterialDict.csv Definition Plain-language definition. NA NA NA IsoValueLines_TopPrecambrian NA Lines that represent structure contours, concentration isopleths, and other lines that share properties of: (A) Having an associated value (e.g., elevation, concentration) that is a real number. (B ) Having a definable uncertainty in their location. (C) Describing an idealized surface that need not be shown as concealed beneath covering map units. Lines here indicate the TOP of Precambrian age rock. NA NA NA IsoValueLines_TopPrecambrian Type Specifies kind of line feature represented by this database row. Values must be defined in Glossary table. Null values not permitted NA NA NA IsoValueLines_TopPrecambrian MapUnit Short, easily understood ASCII-character identifier for the map unit represented by this polygon. Foreign key to DescriptionOfMapUnits table. Use of special characters is discouraged NA NA NA IsoValueLines_TopPrecambrian Value_ft Specifies measured value in feet that pertains to this line feature. Date type = float. Null values not permitted -8000 500 feet IsoValueLines_TopPrecambrian Value_m Specifies measured value in meters that pertains to this line feature, value calculated and rounded to the nearest whole number from original value in feet. Date type = float. Null values not permitted -2438 152 meters IsoValueLines_TopPrecambrian LocationConfidenceMeters Half-width (in meters) of positional-uncertainty envelope around this line feature. Data type = float. Null values not permitted NA NA meters IsoValueLines_TopPrecambrian Symbol References a line symbol in USGS FGDC Digital Cartographic Standard for Geologic Map Symbolization (https://pubs.usgs.gov/tm/2006/11A02/) NA NA NA IsoValueLines_TopPrecambrian Label Describes text label for this line feature. Can be used to store fault name or other easily understood name for line feature. Allows for special fonts to show geologic age symbols. Null values are typical NA NA NA IsoValueLines_TopPrecambrian DataSourceID Identifies source of each data element. Foreign key to DataSources table. Null values not permitted NA NA NA IsoValueLines_TopPrecambrian Notes Optional field. Free text for additional information specific to this feature. Free text for additional information specific to this line feature. Null values permitted NA NA NA IsoValueLines_TopPrecambrian IsoValueLines_TopPrecambrian_ID Primary key. Prefix "IVL". Values must be unique in database. Null values not permitted. NA NA NA IsoValueLines_TopPaleozoic NA Lines that represent structure contours, concentration isopleths, and other lines that share properties of: (A) Having an associated value (e.g., elevation, concentration) that is a real number. (B ) Having a definable uncertainty in their location. (C) Describing an idealized surface that need not be shown as concealed beneath covering map units. Lines here indicate the TOP of Paleozoic age rock. NA NA NA IsoValueLines_TopPaleozoic Type Specifies kind of line feature represented by this database row. Values must be defined in Glossary table. Null values not permitted NA NA NA IsoValueLines_TopPaleozoic MapUnit Short, easily understood ASCII-character identifier for the map unit represented by this polygon. Foreign key to DescriptionOfMapUnits table. Use of special characters is discouraged NA NA NA IsoValueLines_TopPaleozoic Value_ft Specifies measured value in feet that pertains to this line feature. Date type = float. Null values not permitted -5000 600 feet IsoValueLines_TopPaleozoic Value_m Specifies measured value in meters that pertains to this line feature, value calculated and rounded to the nearest whole number from original value in feet. Date type = float. Null values not permitted -1524 183 meters IsoValueLines_TopPaleozoic LocationConfidenceMeters Half-width (in meters) of positional-uncertainty envelope around this line feature. Data type = float. Null values not permitted NA NA meters IsoValueLines_TopPaleozoic Symbol References a line symbol in USGS FGDC Digital Cartographic Standard for Geologic Map Symbolization (https://pubs.usgs.gov/tm/2006/11A02/) NA NA NA IsoValueLines_TopPaleozoic Label Describes text label for this line feature. Can be used to store fault name or other easily understood name for line feature. Allows for special fonts to show geologic age symbols. Null values are typical NA NA NA IsoValueLines_TopPaleozoic DataSourceID Identifies source of each data element. Foreign key to DataSources table. Null values not permitted NA NA NA IsoValueLines_TopPaleozoic Notes Optional field. Free text for additional information specific to this feature. Free text for additional information specific to this line feature. Null values permitted NA NA NA IsoValueLines_TopPaleozoic IsoValueLines_TopPaleozoic_ID Primary key. Prefix "IVL". Values must be unique in database. Null values not permitted. NA NA NA IsoValueLines_BaseCaneRiver NA Lines that represent structure contours, concentration isopleths, and other lines that share properties of: (A) Having an associated value (e.g., elevation, concentration) that is a real number. (B ) Having a definable uncertainty in their location. (C) Describing an idealized surface that need not be shown as concealed beneath covering map units. Lines here indicate the BASE of the Cane River Formation, Late Cretaceous age rock. NA NA NA IsoValueLines_BaseCaneRiver Type Specifies kind of line feature represented by this database row. Values must be defined in Glossary table. Null values not permitted NA NA NA IsoValueLines_BaseCaneRiver MapUnit Short, easily understood ASCII-character identifier for the map unit represented by this polygon. Foreign key to DescriptionOfMapUnits table. Use of special characters is discouraged NA NA NA IsoValueLines_BaseCaneRiver Value_ft Specifies measured value in feet that pertains to this line feature. Date type = float. Null values not permitted -3200 400 feet IsoValueLines_BaseCaneRiver Value_m Specifies measured value in meters that pertains to this line feature, value calculated and rounded to the nearest whole number from original value in feet. Date type = float. Null values not permitted -975 122 meters IsoValueLines_BaseCaneRiver LocationConfidenceMeters Half-width (in meters) of positional-uncertainty envelope around this line feature. Data type = float. Null values not permitted NA NA meters IsoValueLines_BaseCaneRiver Symbol References a line symbol in USGS FGDC Digital Cartographic Standard for Geologic Map Symbolization (https://pubs.usgs.gov/tm/2006/11A02/) NA NA NA IsoValueLines_BaseCaneRiver Label Describes text label for this line feature. Can be used to store fault name or other easily understood name for line feature. Allows for special fonts to show geologic age symbols. Null values are typical NA NA NA IsoValueLines_BaseCaneRiver DataSourceID Identifies source of each data element. Foreign key to DataSources table. Null values not permitted NA NA NA IsoValueLines_BaseCaneRiver Notes Optional field. Free text for additional information specific to this feature. Free text for additional information specific to this line feature. Null values permitted NA NA NA IsoValueLines_BaseCaneRiver IsoValueLines_BaseCaneRiver_ID Primary key. Prefix "IVL". Values must be unique in database. Null values not permitted. NA NA NA IsoValueLines_TopSparta NA Lines that represent structure contours, concentration isopleths, and other lines that share properties of: (A) Having an associated value (e.g., elevation, concentration) that is a real number. (B ) Having a definable uncertainty in their location. (C) Describing an idealized surface that need not be shown as concealed beneath covering map units. Lines here indicate the TOP of Sparta Sand, Eocene age rock. NA NA NA IsoValueLines_TopSparta Type Specifies kind of line feature represented by this database row. Values must be defined in Glossary table. Null values not permitted NA NA NA IsoValueLines_TopSparta MapUnit Short, easily understood ASCII-character identifier for the map unit represented by this polygon. Foreign key to DescriptionOfMapUnits table. Use of special characters is discouraged NA NA NA IsoValueLines_TopSparta Value_ft Specifies measured value in feet that pertains to this line feature. Date type = float. Null values not permitted -1600 200 feet IsoValueLines_TopSparta Value_m Specifies measured value in meters that pertains to this line feature, value calculated and rounded to the nearest whole number from original value in feet. Date type = float. Null values not permitted -488 61 meters IsoValueLines_TopSparta LocationConfidenceMeters Half-width (in meters) of positional-uncertainty envelope around this line feature. Data type = float. Null values not permitted NA NA meters IsoValueLines_TopSparta Symbol References a line symbol in USGS FGDC Digital Cartographic Standard for Geologic Map Symbolization (https://pubs.usgs.gov/tm/2006/11A02/) NA NA NA IsoValueLines_TopSparta Label Describes text label for this line feature. Can be used to store fault name or other easily understood name for line feature. Allows for special fonts to show geologic age symbols. Null values are typical NA NA NA IsoValueLines_TopSparta DataSourceID Identifies source of each data element. Foreign key to DataSources table. Null values not permitted NA NA NA IsoValueLines_TopSparta Notes Optional field. Free text for additional information specific to this feature. Free text for additional information specific to this line feature. Null values permitted NA NA NA IsoValueLines_TopSparta IsoValueLines_TopSparta_ID Primary key. Prefix "IVL". Values must be unique in database. Null values not permitted. NA NA NA IsoValueLines_TopCretaceous NA Lines that represent structure contours, concentration isopleths, and other lines that share properties of: (A) Having an associated value (e.g., elevation, concentration) that is a real number. (B ) Having a definable uncertainty in their location. (C) Describing an idealized surface that need not be shown as concealed beneath covering map units. Lines here indicate the TOP of Cretaceous age rock. NA NA NA IsoValueLines_TopCretaceous Type Specifies kind of line feature represented by this database row. Values must be defined in Glossary table. Null values not permitted NA NA NA IsoValueLines_TopCretaceous MapUnit Short, easily understood ASCII-character identifier for the map unit represented by this polygon. Foreign key to DescriptionOfMapUnits table. Use of special characters is discouraged NA NA NA IsoValueLines_TopCretaceous Value_ft Specifies measured value in feet that pertains to this line feature. Date type = float. Null values not permitted -7000 -2134 feet IsoValueLines_TopCretaceous Value_m Specifies measured value in meters that pertains to this line feature, value calculated and rounded to the nearest whole number from original value in feet. Date type = float. Null values not permitted 5500 1676 meters IsoValueLines_TopCretaceous LocationConfidenceMeters Half-width (in meters) of positional-uncertainty envelope around this line feature. Data type = float. Null values not permitted NA NA meters IsoValueLines_TopCretaceous Symbol References a line symbol in USGS FGDC Digital Cartographic Standard for Geologic Map Symbolization (https://pubs.usgs.gov/tm/2006/11A02/) NA NA NA IsoValueLines_TopCretaceous Label Describes text label for this line feature. Can be used to store fault name or other easily understood name for line feature. Allows for special fonts to show geologic age symbols. Null values are typical NA NA NA IsoValueLines_TopCretaceous DataSourceID Identifies source of each data element. Foreign key to DataSources table. Null values not permitted NA NA NA IsoValueLines_TopCretaceous Notes Optional field. Free text for additional information specific to this feature. Free text for additional information specific to this line feature. Null values permitted NA NA NA IsoValueLines_TopCretaceous IsoValueLines_TopCretaceous_ID Primary key. Prefix "IVL". Values must be unique in database. Null values not permitted. NA NA NA DataDictionary.csv GS ScienceBase U.S. Geological Survey mailing address

Denver Federal Center, Building 810, Mail Stop 302

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. Digital Data https://doi.org/10.5066/P14BV2PI None 20250512 Brooklyn Smout U. S. Geological Survey Geologist mailing and physical

Denver Federal Center, Building 810, Mail Stop 302

Lakewood CO 80225 United States Denver Federal Center, Building 810, Mail Stop 302 bsmout@usgs.gov FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata FGDC-STD-001.1-1999