(1) Harper, D., 1988. Coal mining in Sullivan County, Indiana. Indiana Geological Survey Special Report 43, fig. 14.
(2) Eggert, D.L., 1994. Coal resources of Gibson County, Indiana. Indiana Geological Survey Special Report 50, fig. 17.
(3) Harper, D., and Eggert, D.L., 1995. Coal mining in Knox County, Indiana. Indiana Geological Survey Special Report 54, fig.10.
(4) Harper, D., 1985. Coal mining in Vigo County, Indiana. Indiana Geological Survey Special Report 34, fig. 40.
A modification of this shapefile was subsequently used as the basis for the following figure: Mastalerz, M., and Harper, D., 1998. Coal in Indiana: a geologic overview. Indiana Geological Survey Special Report 60, fig. 4.
This data set was compiled by Indiana University, Indiana Geological Survey, using data believed to be accurate; however, a degree of error is inherent in all data. This product is distributed "AS-IS" without warranties of any kind, either expressed or implied, including but not limited to warranties of suitability of a particular purpose or use. No attempt has been made in either the designed format or production of these data to define the limits or jurisdiction of any federal, state, or local government.
These data are intended for use only at the published scale or smaller and are for reference purposes only. They are not to be construed as a legal document or survey instrument. A detailed on-the-ground survey and historical analysis of a single site may differ from this data.
CREDIT
It is requested that the Indiana Geological Survey be cited in any products generated from this data. The following source citation should be included: [COAL_DANVILLE_THICKNESS_IN: Thickness Ranges of the Danville Coal Member (Dugger Formation, Pennsylvanian) in West-Central Indiana (Indiana Geological Survey, 1:126,720, Polygon Shapefile)]
WARRANTY
Indiana University, Indiana Geological Survey warrants that the media on which this product is stored will be free from defect in materials and workmanship for ninety (90) days from the date of acquisition. If such a defect is found, return the media to Publication Sales, Indiana Geological Survey, 611 North Walnut Grove, Bloomington, Indiana 47405-2208, and it will be replaced free of charge.
LIMITATION OF WARRANTIES AND LIABILITY
Except for the expressed warranty above, the product is provided "AS IS", without any other warranties or conditions, expressed or implied, including, but not limited to, warranties for product quality, or suitability to a particular purpose or use. The risk or liability resulting from the use of this product is assumed by the user. Indiana University, Indiana Geological Survey shares no liability with product users indirect, incidental, special, or consequential damages whatsoever, including, but not limited to, loss of revenue or profit, lost or damaged data or other commercial or economic loss. Indiana University, Indiana Geological Survey is not responsible for claims by a third party. The maximum aggregate liability to the original purchaser shall not exceed the amount paid by you for the product.
Thickness and structure maps of coalbeds are compiled primarily from three sources of data: (1) logs from coal-test drilling, (2) interpretations of geophysical logs, and (3) mine-map notations. The accuracy, precision, and distribution of these three types of data vary greatly. Mine-map notations are probably the most accurate, followed by drilling logs of good quality. Interpretations of geophysical logs have been used where no other publicly available data exist (see detailed discussion below). Because all three types of data were used in the compilation of this shapefile, the user should assume that attribute values are no better than values derived from the least accurate and precise data type (i.e., interpretations of geophysical logs). Original maps of some of the underground mines in Indiana are on file at the Indiana Bureau of Mines and Mining, Vincennes, Indiana (1-812-882-7242.) Copies of many of the maps (as microfiche and photographic prints) are on file at the Indiana Geological Survey, and the mine-map data that was used in the compilation of this shapefile were derived from that source. Notations regarding coalbed thicknesses and geologic discontinuities appear on some maps. Logs from coal-test holes tend to be clustered in areas of past or current mining. During the 1960s geophysical logs of oil-test holes began to be used more extensively to map coal reserves. Most logs of oil-test holes are spontaneous-potential and resistivity logs; the low resolution and the small scale of these logs make estimating coal thickness difficult, and different rock types may produce similar curves. Despite these difficulties, the abundance of geophysical logs and the lack of other sources of data for large areas of potential economic interest have led to an increased reliance on such logs for preliminary mapping of the thickness and structure of coalbeds. Even the depth and thickness of coals as determined by coal-test holes drilled by coal companies must be used with caution. Most drilling included in the public files has been done by rotary or power-auger methods. Rock cuttings rather than cores are recovered with rotary drilling, and the thickness of coal seams is estimated from the time of the first and the last appearance of coal cuttings in the drilling fluid.
It is requested that the Indiana Geological Survey be cited in any products generated from this data. The following source citation should be included: [COAL_DANVILLE_THICKNESS_IN: Thickness Ranges of the Danville Coal Member (Dugger Formation, Pennsylvanian) in West-Central Indiana (Indiana Geological Survey, 1:126,720, Polygon Shapefile)]
WARRANTY
Indiana University, Indiana Geological Survey warrants that the media on which this product is stored will be free from defect in materials and workmanship for ninety (90) days from the date of acquisition. If such a defect is found, return the media to Publication Sales, Indiana Geological Survey, 611 North Walnut Grove, Bloomington, Indiana 47405-2208, and it will be replaced free of charge.
LIMITATION OF WARRANTIES AND LIABILITY
Except for the expressed warranty above, the product is provided "AS IS", without any other warranties or conditions, expressed or implied, including, but not limited to, warranties for product quality, or suitability to a particular purpose or use. The risk or liability resulting from the use of this product is assumed by the user. Indiana University, Indiana Geological Survey shares no liability with product users indirect, incidental, special, or consequential damages whatsoever, including, but not limited to, loss of revenue or profit, lost or damaged data or other commercial or economic loss. Indiana University, Indiana Geological Survey is not responsible for claims by a third party. The maximum aggregate liability to the original purchaser shall not exceed the amount paid by you for the product.