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The structure of and depth to the floor of the Mississippi Valley andRough Creel Grabens and surrounding regionswere interpreted from aeromagnetic data.This cover contains the depth contours for the region within thisstudy area and was clipped from the larger cover.This cover was not plotted in the Wabash Valley map series, but isincluded for those users who are interested in comparing the depthto basement from geologic data (bcontours and bfaults) to the depthto magnetic rocks (usually basement) from geophysical data.Depth units in this cover arekilometers below sea level, whereas depth units in bcontours are inthousands of feet below sea level.
Tags: 1100 - Geology, 1101 - General, 17025 = Clay, 17047 = Edwards, 17055 = Franklin, All tags...
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Hildenbrand and Ravat (1997) inferred the locations of near-surface dikes fromanalyses of high-resolution aeromagnetic data. The lines represent locationsof magnetic highs that they interpreted as dikes. Modeling indicates thedikes are vertical, extend to within 200 m of the surface, and have themagnetic properties of mafic or ultramafic rock. Some of the interpreteddikes coincide with the easternmost Early Permian, mica peridotite andperhaps lamprophyre dikes that Nelson mapped (these are in cover lampdike.)Hildenbrand and Ravat concluded that the interpreted dikes arealso probably Early Permian ultramafic intrusions.
Tags: 1100 - Geology, 1101 - General, 17025 = Clay, 17047 = Edwards, 17055 = Franklin, All tags...


    map background search result map search result map Seismotectonic maps in the vicinity of the lower Wabash Valley,Illinois, Indiana, and Kentucky - Digital Spatial Database:Depth to magnetic rocks Seismotectonic maps in the vicinity of the lower Wabash Valley,Illinois, Indiana, and Kentucky - Digital Spatial Database:Magnetic dikes Seismotectonic maps in the vicinity of the lower Wabash Valley,Illinois, Indiana, and Kentucky - Digital Spatial Database:Magnetic dikes Seismotectonic maps in the vicinity of the lower Wabash Valley,Illinois, Indiana, and Kentucky - Digital Spatial Database:Depth to magnetic rocks