The mapping conducted was based on the best available information. The glacial limit in southern Indiana has been the subject of study and refinement for many years. Among the most important early attempts at delineating the limit through field mapping were those of G. F. Wright, who presented a map of the glacial limit in 1884 and slightly refined the line in 1890. Frank Leverett (1896) contributed to the understanding of the glacial limit through a long career of mapping the Pleistocene deposits of Indiana and adjacent states. Malott summed up previous mapping efforts in 1926; at that time, the outer (older) glacial limit in Indiana became defined sufficiently to establish a standard that held for many years without much change. The pre-Wisconsin glacial limit in some areas of Indiana is discontinuous and is defined primarily by scattered patches of till and erratics, as shown by Thornbury (1937). Most of this work was summarized and improved upon by H. H. Gray in: Gray, H. H., 1988, Map of southern Indiana showing geomorphic features relevant to ice marginal relict drainage, in Gray, H. H., 1989, Relict drainageways associated with the glacial boundary in southern Indiana: Indiana Geological Survey Special Report 45, 9 p.
This data layer is a single line representing the southern limit of glaciation in the state of Indiana. It was derived by digitizing the glacial limit line from Plate 1 of Gray (1989).
Gray, H. H., 1988, Map of southern Indiana showing geomorphic features relevant to ice marginal relict drainage, in Gray, H. H., 1989, Relict drainageways associated with the glacial boundary in southern Indiana: Indiana Geological Survey Special Report 45, 9 p.
Leverett, F., 1896, The glacial deposits of Indiana: Inland Educator, v. 3, p. 24-32. (Additional discussion in v. 3, p. 327.)
Malott, C. A., 1926, The glacial boundary in Indiana: Indiana Academy of Science Proceedings for 1925, v. 35, p. 93-107.
Thornbury, W. D., 1937, Glacial geology of southern and south-central Indiana: Indiana Division of Geology, 138 p.
Wright, G. F., 1884, The glacial boundary in Indiana, Ohio, and Kentucky: Cleveland, Ohio, Western Reserve Historical Society, 86 p.
Wright, G. F., 1890, The glacial boundary in western Pennsylvania, Ohio, Kentucky, Indiana, and Illinois: U.S. Geological Survey Bulletin 58, 112 p.
This data set is provided by Indiana University, Indiana Geological Survey, and contains 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 these data.
COPYRIGHT 2010, THE TRUSTEES OF INDIANA UNIVERSITY, INDIANA GEOLOGICAL SURVEY, ALL RIGHTS RESERVED
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: [PRE-WISCONSIN_GLACIAL_LIMIT_IN: Southern extent of glaciation in Indiana (Indiana Geological Survey, 1:500,000, Line 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 Avenue, 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.
The following was excerpted from H. H. Gray (in preparation), "A principal reason is that deposits of the older glaciations have for a long time suffered the vicissitudes of weathering and erosion. As a result, they are patchy, discontinuous, hard to find, hard to delimit, hard to interpret, and their influence on the landscape has been severely diminished. In many places it is difficult to determine whether the deposit in question was truly ice-lain. And although there were several pre-Wisconsin glacial events in Indiana, they have not yet been definitively sorted out. Earlier attempts to establish an orderly sequence of events have been shown to be faulty. Furthermore, a blanket of wind-blown silt known as loess, which is principally of Wisconsin age, spreads eastward from the Wabash River valley, covers considerable areas of the deposits of the older glaciations, and obscures a part of the glacial boundary.
And so, although it is known that ice of the older glaciations several times covered a large part of southern Indiana, the line that can be drawn marking their extent is discontinuously and uncertainly drawn. It is also subject to revision. The discovery of a patch of erratic boulders, a few previously unknown glacial striations on bedrock, or data from a new bore-hole may cause the boundary to be shifted by a kilometer or two. Thus the “Glacial Boundary” is very much a work in progress."
COPYRIGHT 2010, THE TRUSTEES OF INDIANA UNIVERSITY, INDIANA GEOLOGICAL SURVEY, ALL RIGHTS RESERVED
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: [PRE-WISCONSIN_GLACIAL_LIMIT_IN: Southern extent of glaciation in Indiana (Indiana Geological Survey, 1:500,000, Line 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 Avenue, 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.