The coverage then was rebuilt. Attribute items were added to the coverage arc attribute table. These non-interpreted lines were drawn as solid lines on the map. Wells with information from geologic logs were used to interpret geologic structure. Wells with information for the Minnekahta Limestone were buffered at 1000 meters, creating polygons of singular and in some cases overlapping, well buffers.
Negative values indicate below sea level.
A value of 9999 indicates that the contour is not a multiple of 500. A value of 'Y' indicates that some interpretation was involved in drawing the contour line. Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. 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 this data, software, or related materials.