USGS Geoscience Data Catalog
Additional USGS Geoscience data can be found by geographic location or by publication series.
U.S. Geological Survey Central Region Energy Resources Team, 2002, Public stratigraphic data points of the Herrin Coal in Illinois: U.S. Geological Survey Professional Paper 1625-D, U.S. Geological Survey, Denver, Colorado.This is part of the following larger work.
(ed.), J.R. Hatch , and (ed.), R.H. Affolter , 2002, Resource Assessment of the Springfield, Herrin, and Danville and Baker Coals in the Illinois Basin: U.S. Geological Survey Professional Paper 1625-D, U.S. Geological Survey, Denver, Colorado.This is part of the following larger work.
U.S. Geological Survey, 2002, National Coal Resource Assessment: U.S. Geological Survey Professional Paper 1625, U.S. Geological Survey, Denver, Colorado.
This is a Point data set.
The horizontal datum used is NAD27.
The ellipsoid used is CLARKE1866.
The semi-major axis of the ellipsoid used is 6378206.4 meters.
The flattening of the ellipsoid used is 1/294.98.
DATAFILE NAME: ILSTRAT.ASC
A file consisting of one record for each data point.
8 ITEMS: STARTING IN POSITION 1
COL ITEM NAME WIDTH TYPE N.DEC
IDS 14 C - ISGS identification number
DEC-LONGITUDE 14 N 8 Longitude in decimal degrees
DEC-LATITUDE 14 N 8 Latitude in decimal degrees
SURFELV 6 N 1 Surface elevation (feet)
WELLTYPE 12 C - Well type
LOGTYPE 12 C - Log type
TOP-HERRIN 7 N 2 Elevation of top: Herrin Coal (ft)
THICK-HERRIN 7 N 2 Thickness of Herrin (ft)
Database Administrator: Colin Treworgy Data entry: ISGS Coal Section staff Documentation: Colin Treworgy, D. Nelson and S. Beaverson Quality Control: ISGS Staff
217-244-2422 (voice)
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colin@geoserv.isgs.uiuc.edu
These data were compiled for the National Coal Resources Data System (NCRDS) and the National Coal Assessment of the U.S. Geological Survey (USGS). The complete data base is available from the USGS. This file presents the thickness and elevation data on three of the most important coal seams in Illinois. The data are useful for creating structure or isopachs of the coal seams to aid in exploration for coal, coalbed methane, or oil and gas.
Illinois State Geological Survey, 1998, Coal Quality INFO Database: ISGS Coal Section GIS Database please contact Point of Contact, Illinois State Geologic Survey, Champaign, Illinois.
Accuracy of attribute information is variable, depending
on the source materials and the geologist. Some logs are
precise measurements of thickness and depth, others may have
errors or be rounded. Geologic correlations are, of course,
open to other interpretations. In general: measurements from
core descriptions and coal test geophysical logs are accurate
to within fractions of an inch; measurements from drillers
logs may be accurate to within an inch to 5 feet, depending
on the equipment used and the experience of the on-site geologist;
measurements from oil test geophysical logs are accurate to
within +/- one foot.
Formal evaluation tests have not been run, but daily
hands-on experience using the data for real-life
applications has proven the quality of the database.
Experience suggests that less than 1% of the data contain
errors that involve gross mis-location of points or
mis-correlation of coals.
Concerning the accuracy of horizontal coordinate measurements,
there is considerable variability depending on the source
material. Some holes have surveyed locations and are accurate
to within a foot, others have only description to the nearest
forty acres. Overall, the database administrator estimates that
most points are within 500 feet of their correct locations,
but no scientific tests have been done to verify this.
The database was compiled by ISGS staff for various projects
(primarily related to coal resources, structure, and mining
geology) dating back to 1938. This subset was compiled for
and is available from the USGS's National Coal Resources Data
System. No attempt has been made to compile all available
data. This file does not represent all the well records on
file at the ISGS, nor should the absence of data for one or
more coals for a specific data point be interpreted to mean
that those coals are not present.
Are there legal restrictions on access or use of the data?
- Access_Constraints: none
- Use_Constraints: none
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USGS 1625-D
This Compact Disc-Read Only Memory (CD-ROM) publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Although all data and software published on this CD-ROM are used by the U.S. Geological Survey, no warranty, expressed or implied, is made by the U.S. Geological Survey as to the accuracy of the data and related materials and (or) the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data, software, or related materials.
| Data format: | ESRI shapefile format (.shp), GeoTIFF format (.tif) |
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USGS Professional Paper 1625-D
This Compact Disc-Read Only Memory (CD-ROM) publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
Although all data and software published on this CD-ROM are used by the U.S. Geological Survey, no warranty, expressed or implied, is made by the U.S. Geological Survey as to the accuracy of the data and related materials and (or) the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data, software, or related materials.
| Data format: | Geographic features and attribute data in format ArcView shapefile (version 1.0) |
|---|---|
| Network links: |
<http://energy.cr.usgs.gov/coal/nca/> |
217-244-2422 (voice)
217-333-2830 (FAX)
colin@geoserv.isgs.uiuc.edu
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://geo-nsdi.er.usgs.gov/metadata/professional-paper/1625/d/Il/He/ilhepts.faq.html
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Page Last Modified: Monday, 10-Nov-2008 12:20:39 EST