Geopic of the week: The Maumelle Chaotic Zone

Chaotic zone

This is a picture of sandstone and shale of the Maumelle chaotic zone that outcrops along highway 10 west of North Little Rock, Arkansas.  The Maumelle chaotic zone is part of the Jackfork Formation which forms the bedrock around much of the Little Rock area.  The chaotic zone is called that because of the disarray the rock is in there.  In the example above, broken blocks of sandstone are interspersed with disorganized shale beds that have been rolled, squashed and otherwise deformed (rock hammer at center is for scale).  The rocks weren’t deposited this way but were originally organized into horizontal beds on a deep-water ocean slope.  Before they could be hardened into solid rock, the slope failed and the beds were transported down hill in a massive submarine landslide. 

 

Note:  Other interpretations for this zone have been proffered.  The author of this blog prefers the above interpretation.

 

For more views of the Maumelle chaotic zone click here

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