Bedrock Geology of Illinois

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Frequently-anticipated questions:


What does this data set describe?

Title: Bedrock Geology of Illinois
Abstract:
This feature dataset shows the distribution and extent of the bedrock geologic units within the State of Illinois, as depicted on the map Bedrock Geology of Illinois (2005) by D. Kolata (compiler), published by the Illinois State Geologic Survey.

The component feature classes show geologic units (polygons) and faults (lines.)

The nominal scale of the published hardcopy map is 1:500,000. In some areas data of greater scale were generalized and incorporated.

  1. How should this data set be cited?

    Illinois State Geological Survey, 2005, Bedrock Geology of Illinois: ISGS GIS Database GISDB_BEDGEO.IL_Bedrock_Geology_500K_2005, Illinois State Geological Survey, Champaign, Illinois.

    Online Links:

    Other_Citation_Details: The map scale is 1:500,000
    This is part of the following larger work.

    Dennis Kolata, compiler, 2005, Bedrock Geology of Illinois: Illinois Map Series 14, Illinois State Geological Survey, Champaign, Illinois.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -91.5826823
    East_Bounding_Coordinate: -87.38401652
    North_Bounding_Coordinate: 42.49563968
    South_Bounding_Coordinate: 36.95351896

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: 2005
    Currentness_Reference: publication date

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • G-polygon (1200)
      • String (2850)

    2. What coordinate system is used to represent geographic features?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.

      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:

  7. How does the data set describe geographic features?

    GISDB_BEDGEO.IL_Geologic_Units_500K_2005_Py

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    OBJECTID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    PYCODE
    arbitrary numeric identifier

    ValueDefinition
    2Cambrian System
    3New Albany Shale
    4Muscatatuck Group
    5Tamms Group
    6Cretaceous System
    7Upper Pope Group
    8Lower Pope Group
    9St. Louis Limestone
    10Ste. Genevieve Limestone
    11Warsaw Fm and Salem Ls. in western Illinois
    12Meppen Ls, Fern Glen Fm, Burlington-Keokuk Ls.
    13Gen Park Fm, Hannibal Sh, Chouteau Ls, McCraney Ls, Prospect Hill St, and Starrs Cave Ls
    14Maquoketa Shale Group
    15Galena Group
    16Platteville Group
    17Ancell group
    18Prairie du Chien Group
    19Mattoon Fm
    20Bond Fm
    21Shelburn-Patoka Fms undivided
    22Carbondale Fm
    23Tradewater Fm
    24Caseyville Fm
    25Silurian System
    26Tertiary System
    27Tertiary and Cretaceous Systems undivided
    28Permian ultramafic intrusions
    29Paleozoic undivided
    30Kimmswick Ls and Decorah Fm
    31Ft. Payne Fm, includes Springville Sh and Chouteau Ls in southern IL
    32Ullin and Salem Ls in southern IL
    33Baylis Fm
    35Bordon St, includes Chouteau Ls in east-central IL
    999not a geologic unit

    ABBREV

    LITHNAME

    Shape_Length
    Length of feature in internal units. (Source: ESRI)

    Positive real numbers that are automatically generated.

    Shape_Area
    Area of feature in internal units squared. (Source: ESRI)

    Positive real numbers that are automatically generated.

    GISDB_BEDGEO.IL_Bedrock_Faults_500K_2005_Ln

    Entity_and_Attribute_Overview:
    There are no user-defined attributes for the faults (line) feature class.


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    D. Kolata, P. Weibel, J. Nelson, C. McGarry, J. Devera, B. Denny, et al.

  3. To whom should users address questions about the data?

    Contact_Instructions: Please refer to the Distribution Information section.


Why was the data set created?

This data set was compiled to replace/update the existing feature dataset (IL_Bedrock_Geology_500K_1967), based on the 1967 Willman et al. Geologic Map of Illinois.

The data can be used for any project which requires bedrock data at a scale of 1:500,000. This data should not be used at a scale larger than 1:500,000. Not suitable for site specific work.

The data are not appropriate as a geodetic, legal or engineering base. The data set was not and is not intended as a substitute for surveyed locations, such as can be determined by a registered Public Land Surveyor. Although useful in a GIS as a reference base layer for maps, the data set has no legal basis in the definition of boundaries or property lines.


How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

  3. What similar or related data should the user be aware of?

    , ISGS Terms of Use.

    Online Links:

    , University of Illinois Web Privacy Notice.

    Online Links:

    , University Copyright Policy (stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4).

    Online Links:

    , Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign.

    Online Links:


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    No report.

  2. How accurate are the geographic locations?

    Data were compiled from areas mapped at difference scales. Scale varies across the map. Some source data were generalized. The smallest scale of data used is 1:500,000, and that is the scale of the published map. Geologic unit boundaries are approximate.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    This data set contains geologic units and fault lines as depicted on the source map. There are many additional features on the source map that are not depicted in this digital data set, for example, geologic columns, cross-sections and other thematic insets. Quaternary materials are not shown.

  5. How consistent are the relationships among the observations, including topology?

    No report.


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
ISGS information must be obtained directly from the ISGS or from an authorized distributor. Be aware that ISGS information obtained from an unauthorized third party may have been altered subsequent to original distribution, or may no longer be current.

Any access to these data, Web sites, computer systems, electronic services, and electronic networks is governed by University and campus policies, in particular, but not limited to, the Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign, the ISGS Terms of Use document available at the ISGS Web site, and the University of Illinois Web Privacy Notice.

Links to these are provided in the Cross References section.

Use_Constraints:
ISGS information is the property of and copyrighted by the Board of Trustees of the University of Illinois with all rights reserved.  University copyright policy is stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4. A link is provided in the Cross References section.

Individuals or entities may make fair use of copyrighted ISGS material, such as reproducing a single figure or table, or using a brief text quotation, without obtaining formal permission, but in all cases the Illinois State Geological Survey must be credited as the source of the material. To reproduce ISGS information beyond the fair use standard, permission must be obtained from the ISGS Information Office, 615 East Peabody Drive, Champaign, Illinois 61820, 217-333-4747, isgs@isgs.illinois.edu. License fees and a license agreement may be required, depending on the proposed usage.

Any use of these data is governed by University and campus policies, in particular, but not limited to, the Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign, the ISGS Terms of Use document available at the ISGS Web site, and the University of Illinois Web Privacy Notice. Links to these are provided in the Cross References section.

Map information is to be used at a scientifically and cartographically appropriate scale, that is, at a scale no greater than indicated on the map or as described in the documentation of the map or map data.  Map information is not appropriate for, and is not to be used as, a geodetic, legal, or engineering base. Map information has no legal basis in the definition of boundaries or property lines and is not intended as a substitute for surveyed locations such as can be determined by a registered Public Land Surveyor.

The data do not replace the need for detailed site-specific studies.

  1. Who distributes the data set? (Distributor 1 of 1)

    Information Office, Illinois State Geological Survey (ISGS), a division of the Institute of Natural Resource Sustainability (INRS) of the University of Illinois
    615 East Peabody Drive
    Champaign, Illinois 61820
    USA

    217-333-4747 (voice)
    isgs@isgs.illinois.edu

    Hours_of_Service: 8:00 a.m. - 4:30 p.m., Monday-Friday, U.S. Central Time
  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    Refer to the Legal Notices of Terms and Conditions of the University of Illinois Web Privacy Policy (there is a link in the Cross References section) for policy statements regarding the following:

    Disclaimer of Liability Disclaimer of Warranties and Accuracy of Data Disclaimer of Endorsement Disclaimer for External Links Disclaimer of Duty to Continue Provision of Data Security Choice of Law

    By obtaining these data you agree to the provisions of the University of Illinois Web Privacy Policy, regardless of the manner in which the information was obtained.

  4. How can I download or order the data?

  5. What hardware or software do I need in order to use the data set?

    The data are intended for use with GIS software. The ISGS uses ESRI ArcGIS software, however, ESRI formats can be imported into many different GIS software packages. It is expected that customers who obtain these data have the technical expertise to use GIS software. The ISGS does not provide software support of any kind.


Who wrote the metadata?

Dates:
Last modified: 24-Feb-2009
Metadata author:

Contact_Instructions: Please refer to the Distribution Information section.
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:


Illinois Natural Resources Geospatial Data Clearinghouse

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