Seismotectonic maps in the vicinity of the lower Wabash Valley, Illinois, Indiana, and Kentucky - Digital Spatial Database: Depth to magnetic rocks

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Description The structure of and depth to the floor of the Mississippi Valley and Rough Creel Grabens and surrounding regions were interpreted from aeromagnetic data. This cover contains the depth contours for the region within this study area and was clipped from th
Originators Rhea, Susan
Publication U.S. Geological Survey Open-File Report 97-0681

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States or counties


polygon labels with values between adjacent lines

Label Definition
DEPTH depth intermediate to adjacent depth contours


symbol codes and value of depth contour

Label Definition
CODE symbol used to plot map
DEPTH value of depth contour, kilometers below sea level