Datasets > Illinois > 2005-2009

Elevation of the Karnak Limestone [Illinois]

Illinois State Geological Survey · 2008 Full Details

Full Details

Title
Elevation of the Karnak Limestone [Illinois]
Description
This datafile shows the general elevation of the top of the Karnak Limestone in Illinois. These 20- and/or 100-foot isolines were contoured using Geographix and Z-map Plus software. The contours were created using over 32,000 data points from the ISGS Oracle database. The data covers only those portions of the state where the formation is present and does not include any coverage outside of Illinois where the formation may be present. The data was contoured using fault lines for control and manual adjustments were made to the contours as a final refinement of the computer created contours. This data set is intended for use at a scale of 1:100,000 or greater. This data set was created as part of an effort to update some of the ISGS map products utilizing new data and software capabilities. This data set was developed in order to create an updated version of the map published by H.M. Bristol and R.H. Howard in 1976. These data are appropriate for use in local and regional thematic analysis. The data are not appropriate as a geodetic, legal or engineering base.
Creator
Illinois State Geological Survey
Temporal Coverage
2008
Access Rights
Public
Format
File
Language
English
Date Added
August 28, 2025

Location

Download

Links

Cite and Reference

  • Citation
    Illinois State Geological Survey (n.d.). Elevation of the Karnak Limestone [Illinois]. . https://clearinghouse.isgs.illinois.edu/data/geology/elevation-karnak-limestone (dataset)
  • BTAA Geoportal Link

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