The Kilmichael Structure is a small structural disturbance about 9 kilometers in diameter in central Mississippi. It consists of a central uplift where Cretaceous and Tertiary rocks are uplifted about 450 m relative to their normal stratigraphic level. The uplift is surrounded by a graben with about 150 meters of subsidence, and an outer ring of fault blocks. The maps above show the approximate central part of the structure.
To a casual visitor, the best indication of dsturbance is in pits and
roadcuts where layers are tilted in a region where nothing should be tilted.|
The rocks are soft sandstones and saprolite.
|On smaller scales the saprolite shows fracturing and brecciation.|
|Faulting in sandstone.|
|Shatter cones! You wish. Closer examination shows this texture is merely due to rainfall. The clincher is the small pedestals capped by pebbles (below).|
Created 30 December 2005, Last Update 01 July 2012
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