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This data set was created as part of the ISGS GIS database to show general depth of the Herrin (No. 6) Coal seam. These data are appropriate for use in local and regional thematic analysis. The data are not appropriate as a geodetic, legal or engineering base. The data set was originally created for the purpose of producing maps of well locations in Illinois for geologic research by the ISGS and others. It serves as an important base cartographic element for many types of maps and has been widely distributed and used outside the ISGS. 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. |
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This data set was created as part of the ISGS GIS database to show general depth of the Herrin (No. 6) Coal seam. These data are appropriate for use in local and regional thematic analysis. The data are not appropriate as a geodetic, legal or engineering base. The data set was originally created for the purpose of producing maps of well locations in Illinois for geologic research by the ISGS and others. It serves as an important base cartographic element for many types of maps and has been widely distributed and used outside the ISGS. 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. |
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Data capture, compilation and database maintenance: Marge Bargh, Colin Treworgy, and other ISGS Coal Section staff Compilation and export of data to create this product: Scott Elrick, Blair Tormey, and Chris Korose Documentation: Chris Korose and Andrew Louchios Quality Review: Russ Jacobson, Scott Elrick, and Chris Korose |
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500000 |
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[] |
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This datafile shows a generalized depth to the top of the Herrin (No. 6) Coal in Illinois. These 25-foot contours were created by Earthvision software using over 43,900 data points from the ISGS Coal Section stratigraphic database. Because the depth of the coal was contoured directly from drill hole data (as opposed to creating a map of coal elevation and subtracting it from a map of surface topography) the resulting map is essentially based on the assumption that the land surface is a level plain. Consequently, the accuracy of the map is lowest where the coal is shallowest. Limited data were available in the north central, central, and western portions of the state. The data was contoured using fault lines for control and manual adjustments were made to the contours to reflect the presence of known faults. This data set is intended for use at a scale of 1:100,000. |
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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. |
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| title:
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edx_sp_ree_coal_od.sde.REE0708_IL_Herrin_Depth_Ln |
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| tags:
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["Pennsylvanian","Herrin","geoscientificInformation","depth","geology","coal seams","coal","mineral","resources","Illinois"] |
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en-US |
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500000 |
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